FOR SALE: f3 race bike kr1s / yz490

[Drew]

This is a wicked quick bike, weighing less than 100kg, with the power of a 500cc two stroke motorcross motor in it.
It's really well built, been geared up for road racing. It has been fitted with 17" slicks, and an adjustable steering damper.
This will be a formiddable street circuit, and F3 bike, I bought it for this reason, but have since gotten another race bike so dont need it. (not F3, so wont be the competition.)

call drewgilgeekilberry on 0274294838

might deliver in wellington for big box of beers

NO REINEKENS

[poorbastard]

So in comparison to a 400 in f3 how would it go?

Wanting to give f3 a go and still deciding what sort of bike to get.

[Drew]

hasnt been proven but its fukn quick. think about it

490 single two storke in a kr1s chassis

its tiny compared to 400s, i lean it over an get my elbow on the ground standing stil.

Today on TV from Ruapuna a 45o yamaha in a rs 125 frame cleaned up against the 650s and 400s

[slowpoke]

Looks like a real weapon, anything that light with a big two stroke would be lotsa fun! Good luck with the sale.

[avgas]

any chance of getting it road legal with lights and crap?

[Sensei]

Finding bits for a 490 now adays would be getting abit hard , & trying to keep it kool enough while racing could be another issue . Ran IT 465's 490's & Yz490's on the road & they all seized at one stage reguardless of what I did .

[mikey]

Finding bits for a 490 now adays would be getting abit hard , & trying to keep it kool enough while racing could be another issue . Ran IT 465's 490's & Yz490's on the road & they all seized at one stage reguardless of what I did .

thats some constructive advice. just what a guy needs when hes selling a bike.

this is a weapon. when im riding it. im fukn scared. you have no intentions of buying a race bike as your too slow for the track, and now your slagging off someone elses that you know nothing about. blow a goat.

you can stil get BRAND NEW parts. just becaseu they stop making a bike doesnt mean they stop selling parts. and you probably cant tune them or forget to mix oil or maintain them if you blew yours up repeatedly.

[cowpoos]

Finding bits for a 490 now adays would be getting abit hard , & trying to keep it kool enough while racing could be another issue . Ran IT 465's 490's & Yz490's on the road & they all seized at one stage reguardless of what I did .
run a high idle and over oil with premix

[johnsv650]

is it a single or twin,
f3 rules
single cylinder two stroke 126cc-500cc
production based twin or multi two stroke up too 250 cc

[fallofalot]

Looks a wicked bike. :devil2:

I'd be interested, just a bit short on cash, will contact you if I can sort something out.

Have you run it on a decent track, and how did it go. Does it comply with all the F3 regs, and has it ever passed through scrutineering.

Cheers

[James Deuce]

Scariest bike I've ridden was a YZ490 in a GPz305 frame. It was a friend's F3 bike. On a par with a methanol burning ZX-4 another friend had, in a straight line anyway. Cornering was interesting. The KR-1 chassis would sort that issue out.

Woodruff Key used to turn though and that caused more issues than seizures.

Drew, I wish I could. This looks like my sort of bike.

[xwhatsit]

is it a single or twin,
f3 rules
single cylinder two stroke 126cc-500cc
production based twin or multi two stroke up too 250 cc

The YZ490 is a single. That's the scariest engine... an overseas mate has one, the sound of it and the way the rear wheel just spins up is frightening.

[pete376403]

run a high idle and over oil with premix
I've read one authority on two stroke tuning (Kevin Cameron) that upping the oil in premix is more likely to induce, rather than reduce seizing. His logic was, more oil (as a component of premix) going through the jet = less fuel, ie a leaner mixture. His solution was to keep the fuel/oil ration correct, but increase the jet size.
FWIW Camerons H2R Kawasaki 750 triple was faster than the factory bikes at Daytona. And when it did fail, it was crank bearings rather than pistons.

[pete376403]

f3 rules
single cylinder two stroke 126cc-500cc
production based twin or multi two stroke up too 250 cc
Water cooling ok? A CR500 or KX500 would be a good motor as well.
How about fuel? If you could run methanol, it burns a lot cooler than petrol.

[Sensei]

thats some constructive advice. just what a guy needs when hes selling a bike.

this is a weapon. when im riding it. im fukn scared. you have no intentions of buying a race bike as your too slow for the track, and now your slagging off someone elses that you know nothing about. blow a goat.

you can stil get BRAND NEW parts. just becaseu they stop making a bike doesnt mean they stop selling parts. and you probably cant tune them or forget to mix oil or maintain them if you blew yours up repeatedly.

From owning a IT465 , IT490 & 1 YZ490 & a WR 500 . PE 250 , PE 400 , RM 400 , RM500 i know abit about these bike ya dick !! Wasn't meant to put buyers off this bike just letting them know some History with these type of motors when ridden on the road as that is where mine got used & raced on the dirt . Cooling of a air cooled 500cc 2 stroke has always been difficult as has getting the Fuel ratio correct for flat out rev's . Mikey if you want to try to give out shit make sure you know something about the Topic which is been talked about ! Clearly you don't .

[Sketchy_Racer]

getting the fueling right for two strokes is easy.

if you siezed your twostroke at full throttle, you must have really screwed ya jettin up. Full throttle is the easiset palce to tune for. Most two strokes nip at mid throttle.

But you know that

[Ivan]

EVerthoughtthat if it nipped up you could hard wire a fan into the bike as well to also help cool it down? Its a real good idea.


I would love to own a bike like this

No coin means no buy sorry
good luck with the sale tho:yes:

[Sensei]

getting the fueling right for two strokes is easy.

if you siezed your twostroke at full throttle, you must have really screwed ya jettin up. Full throttle is the easiset palce to tune for. Most two strokes nip at mid throttle.

But you know that

My trouble wasn't from fueling that seized the bike don't know where you all got that from ?? nothing in my post that says that ! Run a 500cc non watercooled 2 stroke bike flat out for 3months on the road & you too will find out what Seizes , But you know that right from running your 150cc Watercooled bike AH !:yes:

[Sketchy_Racer]

There is a reason two strokes sieze, and that because the dolt running them is doing something wrong. Even air cooled motors!!

If it was heat siezing, did you ever think to give it more piston to barrel clearance, to allow the piston to expand more?

Or more ways, of cooling the bike down?

Are you blind. I dont have a 150, its smaller, its a 125

[mikey]

. Ran IT 465's 490's & Yz490's on the road & they all seized at one stage reguardless of what I did .

failure is not making mistakes. its making the same mistakes over and over, by the sounds of things....

[Ivan]

My trouble wasn't from fueling that seized the bike don't know where you all got that from ?? nothing in my post that says that ! Run a 500cc non watercooled 2 stroke bike flat out for 3months on the road & you too will find out what Seizes , But you know that right from running your 150cc Watercooled bike AH !:yes:

Hey man I do know what you mean I have a DR350 bored out to 385 thing gets really hot when riding melts my pants!
I guess a 500cc 2 stroke ringing flat tack is gonna go blow I jst thought wire in a fan might help cool it down a bit more

[Sensei]

failure is not making mistakes. its making the same mistakes over and over, by the sounds of things....

Mistake ?? Blew my T509 SpeedTriple 5 times Mikey , 5 completely different problems . No Mistakes with putting it back together just a weak motor as are many other types of engines are .

[xwhatsit]

Water cooling ok? A CR500 or KX500 would be a good motor as well.
How about fuel? If you could run methanol, it burns a lot cooler than petrol.

I don't think you can run methanol, at least from a vague recollection of another thread. Something about an engine seizing and killing or hurting somebody decades ago, and it being banned as a knee-jerk reaction.

[bumsex]

hey what condition is the engine in? have you had a look? if not can you look up the exhaust posrt please?

[avgas]

Any bike should not blow up due to heat - look up melting points for the materials.
They fail because a component can not handle the stress levels. i.e. rings jam, oil pumps jam, bearings jam, lubricant jets become to thin or clogged.
The 20c part is the death to many a thing - the temperature just helps it from cradle to grave.

[pete376403]

I don't think you can run methanol, at least from a vague recollection of another thread. Something about an engine seizing and killing or hurting somebody decades ago, and it being banned as a knee-jerk reaction.
That was American legend Cal Rayborn - killed at Pukekohe when a meth fuelled Suzuki TR500 seized. Seizure wasn't the fault of the fuel - bikes seize just as well running plain old pump gas. I ran speedway bikes for over 16 years on meth, and never seized a piston (did a few cranks, but thats becuase of lubrication failure, not fuel)

[Drew]

Sorry I aint post answers, been busy on other threads makin an arse of myself.

The piston is un scorred from lookin up the pipe hole.

It's been raced F3 by the previous owner, and cookin itself has not been an issue.

He is the same guy that built it, and is bloody switched on with the engineering side of things.


Comes with a few spares too, full set of clutch fibers, few levers, fairing mounts, and some other shit.


BTW, sensei, you're a dick. Bwahahahahahaha

[Kyle]

many two strokes get there crank and piston lube from the fuel, so full throttle is not really the problem, maximum oil getting in there. The trouble comes when you back off the gas going into corners, the piston is still flying up and down, but there is bugger all oil getting into the crankcase. At least this is the case with dirt bike twostroke engines. thats why most road going twostrokes have oil injection from what i gather.
that rs125 with the 450 is a fourstroke honda crf450 motor if its the one ive seen, and it really hauls. He passed me round the outside, on my cbr600 like i was going backwards, very impressive.
Id say buy this bike because 'dude, 490cc twostroke!!' enough said.

[Drew]

NEWS FLASH, price drop on this bad boy, I'm gonna be moving soon, and dont wanna take it with me, so make an offer if you're keen.:rockon:

[Sensei]

[QUOTE=FIZZERMAN;

BTW, sensei, you're a dick. Bwahahahahahaha[/QUOTE]

Oh that hurts so much , only hope someday to be as Kool as yourself :whocares:

[Ivan]

many two strokes get there crank and piston lube from the fuel, so full throttle is not really the problem, maximum oil getting in there. The trouble comes when you back off the gas going into corners, the piston is still flying up and down, but there is bugger all oil getting into the crankcase. At least this is the case with dirt bike twostroke engines. thats why most road going twostrokes have oil injection from what i gather.
that rs125 with the 450 is a fourstroke honda crf450 motor if its the one ive seen, and it really hauls. He passed me round the outside, on my cbr600 like i was going backwards, very impressive.
Id say buy this bike because 'dude, 490cc twostroke!!' enough said.

Yes there is a Honda RS125 running a CRF450 engine its red its fast and chews tires lots,

ALso there is the Tigcraft SuperMono ridden by Jason Easton it is not a RS125 it has a custom frame called a Tig Craft which uses 125 GP components it uses RS swing arm forks and Fairings bike is 30mm longer than a RS125 and is designed in the UK
http://tigcraft.com/

It uses a YZF450 engine very fast

[Drew]

SOLD.

Happy motoring, and good luck to, FALOFALOT.

[cowpoos]

many two strokes get there crank and piston lube from the fuel, so full throttle is not really the problem, maximum oil getting in there. The trouble comes when you back off the gas going into corners, the piston is still flying up and down, but there is bugger all oil getting into the crankcase. At least this is the case with dirt bike twostroke engines. thats why most road going twostrokes have oil injection from what i gather.
that rs125 with the 450 is a fourstroke honda crf450 motor if its the one ive seen, and it really hauls. He passed me round the outside, on my cbr600 like i was going backwards, very impressive.
Id say buy this bike because 'dude, 490cc twostroke!!' enough said.
thats why ya run a high idle and a 18:1 - 25:1 pre mix... or if your a really clever bugger...and separate oiler... there are guys in the UK that use KX500 engines in side cars and they have the reliability thing sussed with good horsepower...

[Sketchy_Racer]

more oil = less petrol = less bang = less vroom vroom

But, there is a line. the extra oil can help the ring seal against the barrel, thus boosting compression = bigger bang.

Unless you've got groovy VHM head inserts... they're the shiz..

[Ivan]

yeah but to much oil can also be as bad as to little oil,
To much oil gets fouled plugs more smoke

[Sketchy_Racer]

dont ride like a fucken girl then