24mm carb is pathetic even for a bucket!

[speedpro]

First - 24mm carbs aren't hard to find 'cause that's what most if not all the eligible 125cc air-cooled 2-strokes come with. Second - the carb size only seems to be a real handicap on bigger/faster tracks. The smaller carb/bigger motor makes for a torquey setup which has advantages on something like Mt Wellington.

A 125cc 2-stroke will make more power with a bigger carb which would be useful on a bigger/faster track but then it would fade out with heat and be passed by all the water-cooled 100cc 2-strokes and the fast(yeah right) 150cc 4-strokes.

Having said that I can see where it could even things up where there currently "may" be an imbalance between the different F4 categories. However I see tracks, riders, conditions, and tuning contributing more to any current imbalance. Also things like the fact that there aren't, with the exception of the KE/KV Kawasakis, any 125cc air-cooled eligible engines with decent transmissions. Those Kawasaki engines being disc-valve are probably good for about 20hp even with the 24mm carb.

Also Joe from Coleman's had his Suzuki TS125 flying a few years ago so that just shows that it can be done with a 24mm carb. A lot of that was down to the rider though AND it was on Mt Wellington.

[speedpro]

I forgot - Stop stirring Dave!

[Hillbilly]

Both the the 2006 Cagiva Mito 125 and Aprilia RS 125 run Dell'Orto 28mm carbs as stock street bikes. So what's with the 24mm ruling?

[Ivan]

Hotted up aye?

oh you mean the XR250 carb.... that was jetted in my bck yard....

oh and that exhaust system... I thought you said it was shit? you know with the sharp 45 cut and weld .... then the home built muffler

I admit that it does go very well.....

What is hotted up is the CBR 150 with the full race sytem ... very nice that bike!

Im using A KB'r as example

[Jantar]

Also Joe from Coleman's had his Suzuki TS125 flying a few years ago so that just shows that it can be done with a 24mm carb. A lot of that was down to the rider though AND it was on Mt Wellington.

I also ran a hotted up TS125 before the TMs came out, but the Suzuki hot up kit included a 28mm carb.

[F5 Dave]

Hillbilly, those are both watercooled examples so aren't eligible under NZ rules.

Yes I agree that a Water cooled 100 will ultimately be a better bike esp for longer tracks.
Aircooled bikes have to run richer & lower compression if they are to hope to keep producing power for a whole race. The more power you extract, the more you are likely to lose it as it gets too hot.

The 125s are self regulating in that matter, perhaps the bad gearboxes is another disadvantage. I know someone who was toying with a 125 twin as described, but didn’t proceed as the gearboxes are 5 speed & bad ratios. But the ruling could be 28mm on single cylinder air-cooled to quell that argument.

The idea that slamming a 28mm carb on a 125 would produce a monster is unlikely as really a hot 125 is quite restricted with a 28, as I said RS125s came with 39s in the early days. More telling is aircooled MX bikes ran 34s.

I think it would be easier to make a competitive 125 than the current situation, the two routes are build a hot water-cooled 100 which has the most potential, but by far the most work, or just go for a 150.

As for Joe he just made do with animal riding & a blind disobedience to obey the laws of physics.