2000 KX 80 engine rebuild

[GEOF]

Hello there KBer's

As I have already posted, I am new to this forum and I thought some of you might be interested in a current rebuild we are in the process of.
We got this bike, not going, from a chap in Christchurch for a cheap price. Actually we probably paid too much for it but it is our first 2 stroke engine rebuild.

Here are some pics.

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[GEOF]

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We had an accident removing the clutch hub and broke off one of the fingers.
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Engine removed from frame and ready for dis- assembly.
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Engine mounted on the engine stand.
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Engine dis-assembled and benched. I found these little foil pie dishes at the four square. 12 dishes for $ 2.99. They work great for parts seperation.
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Engine mounted on an engine stand we built. Ready for the right side to be dis-assembled.
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We opted for a sleeve as opposed to nikasil coating. There were a few reasons for this. The coating was expensive and the sleeve parts complete with Piston cost approx $ 150.00 landed in NZ. They were imported from Partzilla in the States.

[Crasherfromwayback]

[We opted for a sleeve as opposed to nikasil coating. There were a few reasons for this. The coating was expensive and the sleeve parts complete with Piston cost approx $ 150.00 landed in NZ. They were imported from Partzilla in the States.

Hate to say this Geoff...but I think you'll regret that decision.

[GEOF]

Yeah thanks crash.

We are yet to find out.

There are many reasons we went with a sleeve and price was not the main reason. We wanted the availability to bore out and use this engine to learn about porting and polishing. We really were looking at it more from an engineering project to get edcuated from.
We will be installing our own sleeves later on if we decide to continue on this way.
This has been a great conversation on TT with the americans. From a racing perspective I can see the benifit of Nikasil......... for the weekend warrior and a hobbie engine rebuilder like us......it really came down to an engineering decision.
I will say one thing. I learn't alot from porting this thing. I estimate there would be 80 hours in match porting and blending this cylinder.

Hey crash...........I am interested to know your thoughts on nikasil vs a sleeve.

[Crasherfromwayback]

.

Hey crash...........I am interested to know your thoughts on nikasil vs a sleeve.

In my experience with KX's (mostly 500's admittedly), they never perform as well with sleeves in 'em as they do on the std electrofusion cyl. They seem far more prone to siezures (don't think they transfer the heat as well) and if not properly installed (which obviously ain't a prob with you guys) can cause all sorts of probs. But I was road racing 'em and that's pretty hard on them. On the main jet most of the time for far longer perids than I was ever able to on a 500 in the dirt! Mind you...80's work pretty blooody hard!

[F5 Dave]

from a longevity point of view you can't beat plating. Sleeves are of course worse for heat transfer & are still worse than the old cast in sleeves of the early 80s. If done accurately & tight yo may end up with a merely adequate result. Be careful what rings you run. Gen Kawi rings for example eat iron bores. Wisecos etc are often fit with plated rings & should be okish. Unless they specify otherwise.

Polishing is a total waste of time. Porting, well you kind of have to know what you are doing. Bigger is better maxim will get you into trouble sooner than help you.

That clutch post may be repaired by countersinking a bolt from the back of the basket, but you have to consider a few things.

Use a rattlegun to undo that nut or build a clutch holder out of an old steel plate.

Not sure what your attachments are, don't seem to go anywhere.

[GEOF]

Good info..........Thanks Crash and F5. I am interested to know F5........Are you also racing with your 2 stroke experience?????

We are just weekend warriors.....father and son stuff in the workshop and a few trail rides and hill climbs in the weekend.
The sleeve we installed has bridge releif and the piston has two counter sunk holes in the front for lubrication. We drilled these out 2 thou and added the counter sink.
We have a 2 thou tolerance piston to cylinder clearance and 3 thou tolerance for bridge relief.
I am hoping I have eliminated any major risk of seizures but I am sure there is always the possibility.

F5.......I deleted those attachments.....not sure how it happened. I have reloaded them now.

:drinknsin

[GEOF]

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Match porting the exhaust ports
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Match porting the sleeve to the transfer tunnels.
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New Wiseco crank. I did not want to use this as I have heard too many bad things about them but it was already in another donor engine we are using for parts.

[F5 Dave]

Been racing F4 & F5 (Buckets) forever, but my dirt bikes are purely for play riding. Your clearances sound generous enough to keep out of trouble.

[scott411]

racing or play, sleeves in 2 strokes are nothing but problems most of the time, would not recomend it but your down that road already,

make sure you warm up the bike properly, they cold seize very easily,

[GEOF]

racing or play, sleeves in 2 strokes are nothing but problems most of the time, would not recomend it but your down that road already,

make sure you warm up the bike properly, they cold seize very easily,

Hey Scott..........Thanks for the info. What sort of problems have you experienced? Also good advice on the warming up. Makes sense.

[GEOF]

Hey guys. Here is some info I came across a while back and posted on TT in the states. I am interested to hear your thoughts on this.

I came across this article from RPJ Performance. I sure hope they are right. Nikisal plating is really expensive here and we are not racing mainly riding fast paced fire breaks on hills so I really hope we are doing the right thing. At least for this first build. Anyone please chime in with their thoughts????

I am not saying plating is bad it is that it is not a financial option at this stage.

[
RPJ performance
Why Re-Sleeve?[/size]
Installing Sleeve in a cylinder is required when your stock cylinder has been bored to the last offered over size piston or when a chrome plated cylinder is damaged.

Advantages of sleeves over platting are:

* Heat Transfer: It is claimed the thin plating dissipates more quickly, but a steel liner becomes a heat sink once everything is up to operating temperature, eliminating hot spots in the cylinder wall. I often find plated cylinders with very little time on them up to .005 out of round
* I have seen as much as 5 hp gain on 2 strokes using a steel sleeve, rings seat better with steel liners

* Durability: No thin plating to peel or flake off. Manufactures use Plating to save on production time and money. You donít see plated cylinders in Heavy Duty applications such as Large diesel engines that run for a million miles! With proper Air filter maintenance and good engine oil a steel sleeve will last just as long as Nikasil plating.

* Weight Savings: Yes plating is lighter. But a steel liner for a Honda CR125R weighs 12oz. The first mud hole you ride through adds more weight to your bike than that, or just donít drink that can of soda before your ride!

* Honing: you can work with steel to get perfect piston to cylinder wall clearance. Plated cylinders begin with only a .004 thickness, if honed it may become too thin.

* you can bore steel to fit an oversized piston, rather than throw the cylinder away.

* Porting: Plated cylinders cannot be properly ported, as the plating has to be blended around the insides of ports, once this is ground the platting will begin to strip off causing serious engine damage.

* Rings seal: Ring seal is better to a steel sleeve, plating is much too hard for rings to properly seat.

*Lubrication: Pores in a steel cylinder lining hold oil for lubrication for longer lasting piston & ring life.

* Racing: Sleeves are recommended for all types of riding including racing.

* Tread Green: Sleeve installation is friendly for our Environment, It does not require Harsh chemicals or disposal of Hazardous Waste Materials onto our planet. The materials machined away in the sleeve installation process are recycled.

* Cost Savings: Cylinders can be re-plated but the cost is about $250 every time it is worn or damaged. Once a steel liner is installed it can be re-bored to fit oversized pistons at less that $50 generally over sizes in .010 020,040 060 & .080 are offered. By the time you used up all the bores you will have spent around $350 in machining costs. If you needed to re-plate each time you will have spent $1250!

[Crasherfromwayback]

Advantages of sleeves over platting are:

* Heat Transfer: It is claimed the thin plating dissipates more quickly, but a steel liner becomes a heat sink once everything is up to operating temperature, eliminating hot spots in the cylinder wall. I often find plated cylinders with very little time on them up to .005 out of round
* I have seen as much as 5 hp gain on 2 strokes using a steel sleeve, rings seat better with steel liners

I call bullshit. Long as you warm the thing up as you should...and you should anyway...no way a sleeve dissipates the heat better than a plated cyl.

* Durability: No thin plating to peel or flake off. Manufactures use Plating to save on production time and money. You donít see plated cylinders in Heavy Duty applications such as Large diesel engines that run for a million miles! With proper Air filter maintenance and good engine oil a steel sleeve will last just as long as Nikasil plating.

I call bullshit. There's no reason for it to flake off if it's applied properly in the first place. You'll note that road bikes now more often than not use plated cyls too. Not just dirt bikes now. Plated cyls can also handle the odd siezure without having to be repaired.

* Weight Savings: Yes plating is lighter. But a steel liner for a Honda CR125R weighs 12oz. The first mud hole you ride through adds more weight to your bike than that, or just donít drink that can of soda before your ride!

* Honing: you can work with steel to get perfect piston to cylinder wall clearance. Plated cylinders begin with only a .004 thickness, if honed it may become too thin.

So what. Don't hone 'em. And you can buy diff sized pistons to get really accurate clearances anyway.

* you can bore steel to fit an oversized piston, rather than throw the cylinder away.

No need to bore a plated cyl as they don't wear out.

* Porting: Plated cylinders cannot be properly ported, as the plating has to be blended around the insides of ports, once this is ground the platting will begin to strip off causing serious engine damage.

Bullshit.

* Rings seal: Ring seal is better to a steel sleeve, plating is much too hard for rings to properly seat.

Bullshit. That's why you can't use normal rings in a plated cyl, as they'll fuck it. The rings for a plated cyl are softer so they seal against the hard surface, compared to harder rings that suit a liner.

*Lubrication: Pores in a steel cylinder lining hold oil for lubrication for longer lasting piston & ring life.

Bullshit.

* Racing: Sleeves are recommended for all types of riding including racing.

Bullshit.

* Tread Green: Sleeve installation is friendly for our Environment, It does not require Harsh chemicals or disposal of Hazardous Waste Materials onto our planet. The materials machined away in the sleeve installation process are recycled.

!

Who gives a shit. We're buring fuel aren't we!?

[F5 Dave]

Hey you've got a sleeve in, clearly you will try it & hopefully it will work just fine for you, don't lose any sleep about it.

I will say that with any statement one has to ask what has this person go to offer or gain? I for example have suggested that I don't like sleeves & maybe I don't like to lose face so will stick with that line lest I look silly. I have btw had an engine sleeved to undersize it for a class & that part of the process wasn't a problem.

The blurb you have posted is clearly from someone selling sleeving process. He might have a bias.

Actually I'll piss on a few of his statements. Ones about throwing the cylinder away. - erm, you replate them. Also you can weld damage & replate with surprisingly invisible consequence.


Hmm, just noted Pete's post has some replies edited in main body so I'll not address those.


What I will say though is Works factory bikes over the years of 2 stroke development have had zillions of $ thrown at them. They could easily have sleeved these super low volume cylinders. They were plated. End of his argument I think.

[Crasherfromwayback]

Hey you've got a sleeve in, clearly you will try it & hopefully it will work just fine for you, don't lose any sleep about it.

The blurb you have posted is clearly from someone selling sleeving process. He might have a bias.

Actually I'll piss on a few of his statements. Ones about throwing the cylinder away. - erm, you replate them. Also you can weld damage & replate with surprisingly invisible consequence.


Hmm, just noted Pete's post has some replies edited in main body so I'll not address those.


What I will say though is Works factory bikes over the years of 2 stroke development have had zillions of $ thrown at them. They could easily have sleeved these super low volume cylinders. They were plated. End of his argument I think.

Yeah I fucked that up. Meant to (as in tried to but too simple to) do it in a diff colour font. And yeah...what you say. My SR500 uses a plated cyl. Cost was of no concern on works bikes back then or now. Best poss performance was and still is however.

[GEOF]

Thanks Guys. Good information you have supplied.
I have found it is always good to get a range of opinions and your comments are apprieciated.
I am new to this and I would like to continue learning and that is why I posted that info to see what you guys, who have more experience than me, have to say about it.

Great stuff and thanks.

Please keep commenting as I post new stuff.......... as I really would like to hear your thoughts and ideas. It's a great way to learn I feel.

Cheers. :2thumbsup

[GEOF]

Hey F5......What is works factory bikes???? Is that a company. I googled it and found vintage works factory bikes. Is that the same thing??

[Crasherfromwayback]

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Hey F5......What is works factory bikes???? Is that a company. I googled it and found vintage works factory bikes. Is that the same thing??

Yeah I think he's referring to factory built *works* bikes. I have one in my lounge. It's an SR500 (SR being *Special Race*), as compared to the production KX family you could buy. Now days the race bikes are based on production units with some trick parts thrown at them. Back in the day...they were totally hand built exotica money couldn't buy. Here's some examples for ya...The hubs are sand cast magnesium, the cases are sand cast, the triple clamps hand made from hollow tube and the forks are machined from solid billet. Literally nothing on this bike is a production item baring things like the brake and clutch levers...maybe the brake hose and sprockets. Oh...the front guard is...the rear not. Even the seat base and side covers are not prodcution items. Cost was no consideration back then. Kicking sand in every other cunts face was.

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[F5 Dave]

Yeah I'm meaning the factories own race team bikes they lined up at world GP level, both dirt & road race. While they did production racers, - in themselves specialised low volume race bikes, often the full factory efforts were their best attempts at company pride redemption.

Not everyone is as crazy enough to actually try & buy one that has somehow slipped through the typical year end crush program that most factories employed . But Pete is special.:msn-wink:

[Crasherfromwayback]

But Pete is special.:msn-wink:

lol. In more ways than one you reckon! Very lucky is all. Was just a fluke find.

[GEOF]

Awesome....thanks guys. I did not know that.
I really like that SR 500.
What year is it and did you rebuild it or buy it as it is.........oh and is that in your lounge?????????

[Crasherfromwayback]

Awesome....thanks guys. I did not know that.
I really like that SR 500.
What year is it and did you rebuild it or buy it as it is.........oh and is that in your lounge?????????

Anytime! Cheers, I'm loving it too. Can't wait to wring the fuckers neck actually...but will wait until I restore it to it's former 500cc butt clenching self. It's actually an 83 SR500, that for whatever reason (was perhaps built out the back door as a practice supercross bike or summat) has an 84 SR250 engine fitted. Came with a near new SR250 engine as well...and a spare mag back wheel assemply. There's a geezer in Aust with most of the parts I need to make it a 500 again...he wants my spare engine real bad. Would seem the 250 is poss even rarer than the 500's to find. So I hope to get spares like a works swing arm, fuel tank etc etc as well as the engine bits. Then I can make most of an SR250 as well. 1 1/2 woks bikes can't be all bad!

The bike is as I brought it, bar a soapy wash. The guy (lived in California) got it at a swap meet in 1990 and rode it round the hills of California as his trail bike for 6 years before parking it up. Obviously had no real idea just what he was riding. And yeah...it lives in my lounge. Cunting thing got knocked off it's stand in our shake up the other week. At least it didn't dribble on the carpet. I did though.

[GEOF]

Be careful what rings you run. Gen Kawi rings for example eat iron bores. Wisecos etc are often fit with plated rings & should be okish. Unless they specify otherwise.

Hey there F5

I have used a Wiseco piston kit model 644mo4800. I have been trying to find some information as to weather the rings supplied will be okay for the sleeve. I saw your comments above. Do you think they will be okay. Can you tell me a little more about the different ring types and what I should be looking out for?

Cheers.

Geoff

[F5 Dave]

Piece of paper in wiseco box would have said if only for plated bore. It'll be fine.

Kwai std rings are particularly soft for use with their electrofusion plating which was an early adopter of the process and possibly less robust than other brands, (leaving aside earlier chrome attempts.)

Two soft materials rubbed together will wear alarmingly. Found that out myself. Plate one of them and you're ok.

[GEOF]

Thanks F5.......Good information. There was nothing in the box to suggest they were for Nikasil bore. I am sure they will do the job for both like you said.

[scott411]

you are right doing the research on the rings and pistons, as most of the pistons made for the KX80's will be for a coated bore,

i am not a fan of forged pistons (which weisco are) but they might be your only option with rings etc,

[barty5]

Anytime! Cheers, I'm loving it too. Can't wait to wring the fuckers neck actually...but will wait until I restore it to it's former 500cc butt clenching self. It's actually an 83 SR500, that for whatever reason (was perhaps built out the back door as a practice supercross bike or summat) has an 84 SR250 engine fitted. Came with a near new SR250 engine as well...and a spare mag back wheel assemply. There's a geezer in Aust with most of the parts I need to make it a 500 again...he wants my spare engine real bad. Would seem the 250 is poss even rarer than the 500's to find. So I hope to get spares like a works swing arm, fuel tank etc etc as well as the engine bits. Then I can make most of an SR250 as well. 1 1/2 woks bikes can't be all bad!

The bike is as I brought it, bar a soapy wash. The guy (lived in California) got it at a swap meet in 1990 and rode it round the hills of California as his trail bike for 6 years before parking it up. Obviously had no real idea just what he was riding. And yeah...it lives in my lounge. Cunting thing got knocked off it's stand in our shake up the other week. At least it didn't dribble on the carpet. I did though.

one just sold this year Geoff wards bike all original kx500sr for the small fee of $23,308.50 on bay
http://www.ebay.com/itm/111012793794?ru=http%3A%2F%2Fwww.ebay.com%2Fsch%2F i.html%3F_from%3DR40%26_sacat%3D0%26_nkw%3D1110127 93794%26_rdc%3D1

[scott411]

one just sold this year Geoff wards bike all original kx500sr for the small fee of $23,308.50 on bay
http://www.ebay.com/itm/111012793794?ru=http%3A%2F%2Fwww.ebay.com%2Fsch%2F i.html%3F_from%3DR40%26_sacat%3D0%26_nkw%3D1110127 93794%26_rdc%3D1

cool bike for sure, but from 1986 the USA have run a production rule, meaning frames, cases cylinders have to be production, before this it was run what ever you wanted, Honda's factory bikes were famous for being very trick, and kawasaki did a few as well, yamaha stopped doing works bikes in the early 80's as well,

[Crasherfromwayback]

one just sold this year Geoff wards bike all original kx500sr for the small fee of $23,308.50 on bay
http://www.ebay.com/itm/111012793794?ru=http%3A%2F%2Fwww.ebay.com%2Fsch%2F i.html%3F_from%3DR40%26_sacat%3D0%26_nkw%3D1110127 93794%26_rdc%3D1

Yeah I was watching them with interest thanks mate. Was buying lotto tickets hard out when he was selling his collection. KInda sad to see though. He's obviously come unstuck $'s wise.


cool bike for sure, but from 1986 the USA have run a production rule, meaning frames, cases cylinders have to be production, before this it was run what ever you wanted, Honda's factory bikes were famous for being very trick, and kawasaki did a few as well, yamaha stopped doing works bikes in the early 80's as well,

Yeah sucked when that rule came in. End of (a very cool) era. Glad the SR I got was pre.

[ktm84mxc]

Crasher did get lucky with his SR purchase and good on him for it, lucky bastard. There's quite a few ex works bikes available in the US and Europe check out worksbikes.com it's run by Terry Good and you can source it trough www.vmxmag.com.au . Honda were the ones who sent the bikes to the crushers though many did escape, my fav a RCM125 twin with leading link forks or YZM500 alloy frame etc.
The early 80's were the heyday of the genuine Factory bikes be it a SR,RC,OW, RH,RA .

[Crasherfromwayback]

Crasher did get lucky with his SR purchase and good on him for it, lucky bastard. There's quite a few ex works bikes available in the US and Europe check out worksbikes.com it's run by Terry Good and you can source it trough www.vmxmag.com.au . Honda were the ones who sent the bikes to the crushers though many did escape, my fav a RCM125 twin with leading link forks or YZM500 alloy frame etc.
The early 80's were the heyday of the genuine Factory bikes be it a SR,RC,OW, RH,RA .

Very lucky for sure. And thanks. Talking of the YZM (one of THE sexiest works bikes ever built I reckon)...this came up for sale recently. Lots of other eye candy to be seen on the site too...

http://vintageworksbikes.com/1988YamahaOW500.html

[Jay GTI]

Very lucky for sure. And thanks. Talking of the YZM (one of THE sexiest works bikes ever built I reckon)...this came up for sale recently. Lots of other eye candy to be seen on the site too...

http://vintageworksbikes.com/1988YamahaOW500.html


Wow! Only took another 17 years for the frame to make it to the production bikes....

[Crasherfromwayback]

Wow! Only took another 17 years for the frame to make it to the production bikes....

I reckon. Seriously trick bike that one though.

[scott411]

Very lucky for sure. And thanks. Talking of the YZM (one of THE sexiest works bikes ever built I reckon)...this came up for sale recently. Lots of other eye candy to be seen on the site too...

http://vintageworksbikes.com/1988YamahaOW500.html

what did it go for? probably the only Yamaha i would ever want to own,

[Crasherfromwayback]

what did it go for? probably the only Yamaha i would ever want to own,

From memory they were asking 40,000 Euro mate. If I'd won lotto I'd have it in a flash. Mind you...the brand new never ridden RN500 is fucking horn too.

[F5 Dave]

Quick look. . .hmm, doesn't look very factory, looks like a production model with flashy graphics. Oh hold on, ally frame. Oh wait, [as casts mind back], the 490s were still aircooled! With PV too. Keeps looking. Its quite a trick to make a works bike look like its production bike tidy.

[Crasherfromwayback]

Quick look. . .hmm, doesn't look very factory, looks like a production model with flashy graphics. Oh hold on, ally frame. Oh wait, [as casts mind back], the 490s were still aircooled! With PV too. Keeps looking. Its quite a trick to make a works bike look like its production bike tidy.

Loving the alloy airbox/subframe.

[scott411]

From memory they were asking 40,000 Euro mate. If I'd won lotto I'd have it in a flash. Mind you...the brand new never ridden RN500 is fucking horn too.

There was one of those in NZ a while back a customer of mine had,

his collection of mid 80's japanese 2 strokes road bikes was to die for, (RG500, NS400, RZ400 and 500) all mint,

[Crasherfromwayback]

There was one of those in NZ a while back a customer of mine had,

his collection of mid 80's japanese 2 strokes road bikes was to die for, (RG500, NS400, RZ400 and 500) all mint,

Choice! I wish I'd kept one of my KR1's.

[scott411]

Choice! I wish I'd kept one of my KR1's.

yeah be interesting to know what happened to all of the SP's, wonder if there are any unraped versions around,

[Crasherfromwayback]

yeah be interesting to know what happened to all of the SP's, wonder if there are any unraped versions around,

I know of a very nice tidy original one...but the geezer won't part with it. Pretty sure all ten of 'em got used mate.

[scott411]

I know of a very nice tidy original one...but the geezer won't part with it. Pretty sure all ten of 'em got used mate.

yeah, no one thought of keeping one back then i bet either, it would be cool to see road racing get a class like that again, i remember watching as a kid watching the street races with big fields of 40-50 bikes, just massive,

[Crasherfromwayback]

yeah, no one thought of keeping one back then i bet either, it would be cool to see road racing get a class like that again, i remember watching as a kid watching the street races with big fields of 40-50 bikes, just massive,

Aye. When I first started road racing my KX500...there was 80 entrants in F2 for the Auck Street races from memory. Had to be split into groups/races. Unreal.

[scott411]

Aye. When I first started road racing my KX500...there was 80 entrants in F2 for the Auck Street races from memory. Had to be split into groups/races. Unreal.

i remember that port street race, the first job i ever did for kawasaki was to sell t shirts thier, they said "Kawasaki, its who i am" wish i had kept one of them to,

[Crasherfromwayback]

i remember that port street race, the first job i ever did for kawasaki was to sell t shirts thier, they said "Kawasaki, its who i am" wish i had kept one of them to,

I had a blast there and beat up on more than a few top pilots on their GP bikes. Pricks made me start off 40th on the grid in both races. Finished 6th in both from memory.

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[gwynfryn]

Hey GEOF if you need a new pipe for the 80 cycletreads in Auckland have bills nickel down to $120 from $629.

[GEOF]

Awesome thanks....lI will have a look.

[Stylo]

Very lucky for sure. And thanks. Talking of the YZM (one of THE sexiest works bikes ever built I reckon)...this came up for sale recently. Lots of other eye candy to be seen on the site too...

http://vintageworksbikes.com/1988YamahaOW500.html

Thanks for the link and Holy Moly .. that YZM is porn

I'm still riding VMX bikes but only in my dreams these days dammit

[Crasherfromwayback]

Thanks for the link and Holy Moly .. that YZM is porn

I'm still riding VMX bikes but only in my dreams these days dammit

No worries. The guy that owns the site is an awesome dude. He hooked me up with the guys that are helping me get my SR250/500 back to it's proper 500cc guise! Slowly making head way. Will post pics of it once it's a 500 again.

[Stylo]

No worries. The guy that owns the site is an awesome dude. He hooked me up with the guys that are helping me get my SR250/500 back to it's proper 500cc guise! Slowly making head way. Will post pics of it once it's a 500 again.

Look forward to your progress with the SR.

I'm in the process of changing the gearing on my '04 from std 14/47 to a 14/50 combo and an RK X-ring chain I picked up recently. Should make it a bit more lively in the 3-4 gears where the torque is and I don't need the top end speed anyways. Done a bit of research and they say it's almost like putting a KX5 on steroids, not sure about that but I'll be interested in how it goes. Even a mild dose won't do any harm I'm sure.

[Crasherfromwayback]

Look forward to your progress with the SR.

I'm in the process of changing the gearing on my '04 from std 14/47 to a 14/50 combo and an RK X-ring chain I picked up recently. Should make it a bit more lively in the 3-4 gears where the torque is and I don't need the top end speed anyways. Done a bit of research and they say it's almost like putting a KX5 on steroids, not sure about that but I'll be interested in how it goes. Even a mild dose won't do any harm I'm sure.

Yeah but I won't hijack Geofs thread anymore about it. I have my own on it. Gearing 'em down is a waste of time I reckon. They work better in my opinion geared up. Make 'em work hard...less wheelspin and a longer pull in each gear.

[scott411]

Yeah but I won't hijack Geofs thread anymore about it. I have my own on it. Gearing 'em down is a waste of time I reckon. They work better in my opinion geared up. Make 'em work hard...less wheelspin and a longer pull in each gear.

agree 100%, i used to gear mine up as well, they just wheel stand otherwise,

[Crasherfromwayback]

agree 100%, i used to gear mine up as well, they just wheel stand otherwise,

Yep. That or just dig a trench! Sometimes both. But geared up...you can do most tracks with less gear changes and use only a couple of gears too eh!

[T.W.R]

Just un-earthed a brand new set of fork springs for one of these, can have them cheap if wanted :msn-wink:

[F5 Dave]

Who knows what springs the SR takes? Probably forged by Japanese virgins. Or are we talking about the 80?, just wanted to keep the hijack on track ( gear changes irrespective ).

[T.W.R]

Who knows what springs the SR takes? Probably forged by Japanese virgins. Or are we talking about the 80?, just wanted to keep the hijack on track ( gear changes irrespective ).

:bleh: the 80...brand new taken out of a 06 85 soon as it was taken out of the crate, got shelved then a month later were going to be tossed to the dump so I saved them :msn-wink: got a good stash of goodies like that :niceone:

Should see what a KX250 does when the gearing is shortened up :first: instant single seat MX chopper :laugh:

[GEOF]

Classic........Too late on the Hijack crasher................

NIce work though.......good information.