Got me a new bucket !!!

[Ivan]

:not: Hey I got me a new open class bucket racer today, I scored a GT125 sounds like its going to be good except for one thing, I found out It is 2 stroke so its going to need new exhausts is it possible to run a 2 into one exhaust on a 2 stroke as I know you can on fours its twin cylinder and from what I know its going to be allright, have to find out if its CDI or not I want it to have a narrow power band but have quick response at getting there. It will be a fast little machine dont know exactly what has been done to the motor will have to port it, I get it on Monday frpm Weltec
So all you guys in Wellington are going to have to start :not: to me

[riffer]

Cool bike. I had a GP125 but always wanted the GT 'cause it was a twin AND had RAM-AIR. :love: 16HP for the GT versus 15 for the GP. The GT had the reed valves rather than the rotary valves of the GP. Now that I look back, you didn't really get a lot more for the extra piston. Maybe it was the weight of those chrome exhausts...

Can't remember about the ignition but I seem to recall they had CDI. Best to check though. It was a loooooong time ago and as madboy has reminded me, my memory is crap.

Whatcha doing with the old bucket?

[Ivan]

Cool bike. I had a GP125 but always wanted the GT 'cause it was a twin AND had RAM-AIR. :love: 16HP for the GT versus 15 for the GP. The GT had the reed valves rather than the rotary valves of the GP. Now that I look back, you didn't really get a lot more for the extra piston. Maybe it was the weight of those chrome exhausts...

Can't remember about the ignition but I seem to recall they had CDI. Best to check though. It was a loooooong time ago and as madboy has reminded me, my memory is crap.

Whatcha doing with the old bucket?

Well I'm keeping the old RG50 as that bike is still furking cool, I dont know what the other is other than my AX100 but I dont know what I'm doing with that at the moment the good all GT cost me a ford escort panel van

Im gonna be :crybaby: when that go's but o well a buckets a bucket you dont get in trouble by the cops for thrashing your bucket

[Skunk]

It is 2 stroke so its going to need new exhausts is it possible to run a 2 into one exhaust on a 2 stroke as I know you can on fours its twin cylinder and from what I know its going to be allright, I'm sure the answer is no. Here's a link to how two stroke chambers work - here (http://www.southernskies.net/page_info/runningtwostrokeengine.html). If you look at the last pic you'll see that having two exhausts into one chamber would stuff up the returning pressure wave...

[Ivan]

I'm sure the answer is no. Here's a link to how two stroke chambers work - here (http://www.southernskies.net/page_info/runningtwostrokeengine.html). If you look at the last pic you'll see that having two exhausts into one chamber would stuff up the returning pressure wave...

Yeah you PM'd me that furk that sucks have to build an expansion chamber but fairly similar will run it the good ol fashioned way to start with until I build up me old Aprillia chassis

[gav]

What size carbs does it have? You do know that with an air cooled 125 you are only allowed to run the equivalent of a 24mm carb, so that means to run twin carbs, you will need to have no bigger than 2 x 12mm carbs to be legal!

[Ivan]

What size carbs does it have? You do know that with an air cooled 125 you are only allowed to run the equivalent of a 24mm carb, so that means to run twin carbs, you will need to have no bigger than 2 x 12mm carbs to be legal!


Damn have you seen how buckets has gone the rules are gone most of the buckets are basically GP bikes now noone runs legal carbs these days I'm running it how it has been tuned and its staying like it tell me how many guys run 12mm carbs only me on my RG50

[Kickaha]

Damn have you seen how buckets has gone the rules are gone most of the buckets are basically GP bikes now noone runs legal carbs these days I'm running it how it has been tuned and its staying like it tell me how many guys run 12mm carbs only me on my RG50


The rules aren't "gone" they are still in the MNZ rule book as they always have been and it's up to the clubs and competitors to enforce them, if anyone has to cheat to get anywhere then they're not much of a rider and shouldn't be allowed on the track


On your RG50 you can run any size carb you want on an air cooled twin over 100cc you are restricted on carb size, read the rule book it's all in there

[Eurodave]

If you look at the last pic you'll see that having two exhausts into one chamber would stuff up the returning pressure wave...


Yeah,wot he said, remember back in the '70s when GT380/550/750,s could run 3 into1's? sure sounded cool but dicked the power output big time

[Kickaha]

Yeah,wot he said, remember back in the '70s when GT380/550/750,s could run 3 into1's? sure sounded cool but dicked the power output big time

We had two GT550 triples with 3-1 and yes it slowed them down but we considered that awesome sound a worthwhile trade off

[Eurodave]

We had two GT550 triples with 3-1 and yes it slowed them down but we considered that awesome sound a worthwhile trade off


I rest my case! :done:

[Ivan]

Nah I dont want to cheat but I mean, you got to think it will probably has that size on it standered its a bucket racer any ways it is at weltec tho

[k14]

What size carbs does it have? You do know that with an air cooled 125 you are only allowed to run the equivalent of a 24mm carb, so that means to run twin carbs, you will need to have no bigger than 2 x 12mm carbs to be legal!
Yes the total allowable size is 24mm but that doesn't equate to the same surface area as 2 12mm carbs. More like 2 16 or 17mm carbs, can't remember off the top of my head but its something around there, pretty easy to work out anyway.

[Ivan]

Yes the total allowable size is 24mm but that doesn't equate to the same surface area as 2 12mm carbs. More like 2 16 or 17mm carbs, can't remember off the top of my head but its something around there, pretty easy to work out anyway.


Wat the have you guys seen the bikes running down Wellington they are blimin Honda RS125 rip offs I think HRC might employ a few of those mechanics to get there RS125s running even faster

[TonyB]

You'll definitely need two pipes. The reason two strokes make so much power is that they can employ expansion chambers, which do two things- they suck the new mixture into the cylinder, and then compress it- effectively supercharging the engine.

[Ivan]

You'll definitely need two pipes. The reason two strokes make so much power is that they can employ expansion chambers, which do two things- they suck the new mixture into the cylinder, and then compress it- effectively supercharging the engine.


Yeah I know im going to make it look like a 250 GP bike

[gav]

Racers will build a bike to suit the rules in place. How many 125 two stroke twins do you see racing? Not many, if any, huh? Wonder why that is? :whistle:

[Pickle]

Back in the early days of Bucket racing a few guy's ran Suzuki T90's, twins that sounde cool with chambers BUT not very fast.
Good Luck with the GT

[gav]

Yeah, the T90 wolf would be fine as wouldnt be handicapped by the rules and regs as the 125's are. Mate of mine ran a 100cc Yamaha 2 stroke twin in Nelson, had potential but seemed a temperamental piece of kit.

[Ivan]

Yeah, the T90 wolf would be fine as wouldnt be handicapped by the rules and regs as the 125's are. Mate of mine ran a 100cc Yamaha 2 stroke twin in Nelson, had potential but seemed a temperamental piece of kit.


Oh well its a bucket and I mean if I can race then I can race aint it all about fun

[gav]

Well until you start beating people and they find out your bike is a cheater :devil2:

[Ivan]

Well until you start beating people and they find out your bike is a cheater :devil2:


I aint gonna cheat i'm gonna run it into the rules like I said I dont know what it is like as I havnt seen it :done:

[Kickaha]

Yeah, the T90 wolf would be fine as wouldnt be handicapped by the rules and regs as the 125's are. Mate of mine ran a 100cc Yamaha 2 stroke twin in Nelson, had potential but seemed a temperamental piece of kit.

Diesel Pig has a T90 sitting at his place although someone has converted it to 125, so thats waiting inline to be done after his reverse cylinder project and the Turbo

[Ivan]

Diesel Pig has a T90 sitting at his place although someone has converted it to 125, so thats waiting inline to be done after his reverse cylinder project and the Turbo


T90 2 smoke if so Turbo? is that in the rules I know it is for four stroke 100s

[k14]

T90 2 smoke if so Turbo? is that in the rules I know it is for four stroke 100s
Well if you could actually read properly you would see that the t90 and the turbo are completly different projects. :whistle:

[Rhino]

Yes the total allowable size is 24mm but that doesn't equate to the same surface area as 2 12mm carbs. More like 2 16 or 17mm carbs, can't remember off the top of my head but its something around there, pretty easy to work out anyway.

The maths work out to two 16.9mm carbs. I don't think anyone will complain if you run 17mm carbs. :)

[diesel pig]

The maths work out to two 16.9mm carbs. I don't think anyone will complain if you run 17mm carbs. :)


Well your screwed Ivan, a GT125 has 18mm dia carbs and kickaha why don't you tell everbody about my bucket projects Oh thats right you HAVE! but since we are talking about the T90 project does anyone have a Honda QR50 and does it have a Aluminium barrel? and if you can't work out why I asked that I'm not telling!! :whistle:

[Ivan]

Well if you could actually read properly you would see that the t90 and the turbo are completly different projects. :whistle:

It looks like that when you fast scrolling

[Ivan]

Well your screwed Ivan, a GT125 has 18mm dia carbs and kickaha why don't you tell everbody about my bucket projects Oh thats right you HAVE! but since we are talking about the T90 project does anyone have a Honda QR50 and does it have a Aluminium barrel? and if you can't work out why I asked that I'm not telling!! :whistle:

Nah I aint screwed a good racer has spare parts lined up :not: :not: :not: :not:

[k14]

Nah I aint screwed a good racer has spare parts lined up :not: :not: :not: :not:
So you're gonna downsize the carbs?? Thats a new one :rofl:

[Ivan]

So you're gonna downsize the carbs?? Thats a new one :rofl:


Maybe I am but carb size dont matter if I add ram air into the carbs direct, I enjoy tweaking and tuning until I get it right and if I remember 2 strokes didnt come out with reeds till the late 80's so I might have to add them,

[F5 Dave]

Damn have you seen how buckets has gone the rules are gone most of the buckets are basically GP bikes now noone runs legal carbs these days I'm running it how it has been tuned and its staying like it tell me how many guys run 12mm carbs only me on my RG50

Hey Ivan, try running a bit of grammar in there huh? Remember we can't hear your voice inflection. Makes it hella hard to read, let’s try with just a minimum tickle:


“Damn have you seen how bucket rules have gone? Most of the buckets are basically GP bikes now. No-one runs legal carbs these days. I'm running it how it has been tuned and it’s staying like it. Tell me how many guys run 12mm carbs? only me on my RG50.”

Much betterer huh?


Well my bike is legal to the rules, as are most. Read the rules, they are in your licence book. Chassis is free, engine can’t contain any competition parts bar carb/ignition & now piston.

A few people have pushed the cc rule in the 4 strokes as 140 rule was hard to find parts for, (not that I condone that) 150 rule should have fixed that. 125 air-cooled should have equiv 24mm carb. Everything else is open carb size (bar 100cc 4 strokes in F5, -but I’ve never seen one).

The trick is to choose a bike that can utilise the rules to best effect. For example the GT125 is a twin - hence will have a natural power advantage, all other things being equal. The rotary valve system is another advantage. Reeds are all very well but rotary valve has made a come back in 125GP bikes, all the Aprillia & Derbi bikes were rotary valve, late 90s early 2000s (not sure if they still are).

[Ivan]

Hey Ivan, try running a bit of grammar in there huh? Remember we can't hear your voice inflection. Makes it hella hard to read, let’s try with just a minimum tickle:


“Damn have you seen how bucket rules have gone? Most of the buckets are basically GP bikes now. No-one runs legal carbs these days. I'm running it how it has been tuned and it’s staying like it. Tell me how many guys run 12mm carbs? only me on my RG50.”

Much betterer huh?


Well my bike is legal to the rules, as are most. Read the rules, they are in your licence book. Chassis is free, engine can’t contain any competition parts bar carb/ignition & now piston.

A few people have pushed the cc rule in the 4 strokes as 140 rule was hard to find parts for, (not that I condone that) 150 rule should have fixed that. 125 air-cooled should have equiv 24mm carb. Everything else is open carb size (bar 100cc 4 strokes in F5, -but I’ve never seen one).

The trick is to choose a bike that can utilise the rules to best effect. For example the GT125 is a twin - hence will have a natural power advantage, all other things being equal. The rotary valve system is another advantage. Reeds are all very well but rotary valve has made a come back in 125GP bikes, all the Aprillia & Derbi bikes were rotary valve, late 90s early 2000s (not sure if they still are).

Hey you will be lucky if this bikes carbs are even 17 they are that small, Yes I know your bike is in the rules Dave but I am saying what is the chance that a puddy little stock bike with 18mm carbs say and is a twon is going to give your bike a run for its money not complaining just using your bike as an exampel

[Ivan]

Hey you will be lucky if this bikes carbs are even 17 they are that small, Yes I know your bike is in the rules Dave but I am saying what is the chance that a puddy little stock bike with 18mm carbs say and is a twon is going to give your bike a run for its money not complaining just using your bike as an exampel


Nah mynes reed valve I got the bike and I am working on it but its not doing to well firing on one cylinder dead plugs bike wont even ride, Well it should be fine these carbs are only 17mm Maximum

[F5 Dave]

Hold on a min, crumbs these things are so old I’d forgotten. GP125s are rotary valve singles. GTs are 125 piston port twins, no reeds.
T125 stingers (like wolfs are erm, probably piston ports, maybe rotary, can’t recall).

Course you could make a short manifold & a 24mm carb. Maybe with a reedblock or two could be the go.

[Ivan]

Hold on a min, crumbs these things are so old I’d forgotten. GP125s are rotary valve singles. GTs are 125 piston port twins, no reeds.
T125 stingers (like wolfs are erm, probably piston ports, maybe rotary, can’t recall).

Course you could make a short manifold & a 24mm carb. Maybe with a reedblock or two could be the go.


Nah Dave its a twin but the reed idea is actually a good Idea I just had the carbs off and it dont have reed so I might make my own Manifold with a reed cage and I could join it couldnt I so I only need one carb

[speedpro]

Nah Dave its a twin but the reed idea is actually a good Idea I just had the carbs off and it dont have reed so I might make my own Manifold with a reed cage and I could join it couldnt I so I only need one carb

Guys in AK got one of these and made a manifold that joined the two cylinder intakes together using copper plumbing tube. In the middle they had a "T" with a 24mm carb hanging off that. It wasn't particularly "high-performance" looking but went well enough considering other aspects of the bike. You don't need reeds.
I had a piston port Suzuki TS100 single which had a very nice powerband AND made 19.9hp. LOTS and LOTS of careful work of course but it had a nice powerband even with 200deg of ex timing and 200deg of intake timing. Pete Sales also did a twin years ago and it went real well.

[geoffm]

Nah Dave its a twin but the reed idea is actually a good Idea I just had the carbs off and it dont have reed so I might make my own Manifold with a reed cage and I could join it couldnt I so I only need one carb

I would supect getting it running well on a single carb would be some feat. The length of the intake will be to long for the rev range you are working in. The inlet won't suit taking a read block and you will have fun fitting one. All be more trouble than it is worth IMO. Nothing is imposible, but I would have thought the effort woudl be better expended elsewhere - tyres, suspension, frame, rider, porting and pipes in no particular order.
Geoff

[Ivan]

I would supect getting it running well on a single carb would be some feat. The length of the intake will be to long for the rev range you are working in. The inlet won't suit taking a read block and you will have fun fitting one. All be more trouble than it is worth IMO. Nothing is imposible, but I would have thought the effort woudl be better expended elsewhere - tyres, suspension, frame, rider, porting and pipes in no particular order.
Geoff


Hey all thats done, I got me an Aprillia RS50 chassis lined up good suspension good tyres good frame good farings, I'm not to bad a rider I think, No porting has been done new piston and rings kit new oil pipes are being made I'm still at school and have access to the workshops to do this and also my uncles an engineer so he can help

[Ivan]

Bike seems to be running well at the momment on single cylinder let alone when I add the new spark plug to get the other cylinder running now this bike should be fun, I dont worry if I win any small races cause me and RG100!! are gonna win the bucket enduro on the FXR150

[texmo]

Maybe I am but carb size dont matter if I add ram air into the carbs direct, I enjoy tweaking and tuning until I get it right and if I remember 2 strokes didnt come out with reeds till the late 80's so I might have to add them,
Why do you want reed valves any way?

[Ivan]

Why do you want reed valves any way?

They are better they rely on vacuum pressure and also help prevent blow back from the carbs but any way I just got a spark plug and now my motor sings almost high sided me on our grass am so used to RG50 abd jumped on that and man was it good, me and dad are also going to port it with tooth paste just to make the ports smooth and shiny he says used to make the bikes sing in the 80's

[Bert]

me and dad are also going to port it with tooth paste just to make the ports smooth and shiny he says used to make the bikes sing in the 80's

try chrome polish and a die grinder with a polishing bit,
though in saying this, don't you want a wee bit of intake turblance ?
you would have to turn to the two-stroke tuning bible, G Bell.

Good luck with the twin (man more moving two-stroke parts to stuff)
be interesting to see it go at the next meeting.

[Ivan]

try chrome polish and a die grinder with a polishing bit,
though in saying this, don't you want a wee bit of intake turblance ?
you would have to turn to the two-stroke tuning bible, G Bell.

Good luck with the twin (man more moving two-stroke parts to stuff)
be interesting to see it go at the next meeting.


Yeah I reckon cant wait till the next round its going to be mad, me on my little twin cylinder 125 two smoke, Doesnt smoke much either I found one problem, I kept starting it on one cylinder and the second exhaust is now fill with petrol and oil and flooded lol, but oh well it still go's so hard