Here are the current parts on this build:
- Polini Corsa 72cc kit
Polini Variator w/6g rollers
Polini 24mm PWK D Slide Carb w/ 118/42 jets
Stage 6 pod filter
TWH intake manifold
Stage 6 clutch
TWH clutch bell
16x42 Gearing (9.1:1)
RRGS Lowdown Forks (310mm)
NCY Disc Caliper
TWPO 220mm rotor
NCY bearing throttle
JDM Dio Taillight
JDM Dio ZX Wheels
Running 32:1 premix with Castor 927 oil on a NGK B8HS plug & 92 octane fuel
Right now the bike runs really well. I bought it with a 110 main jet in the 24mm carb and it liked to get into some pretty high temps when cruising above 35mph or going WOT for about a minute or so I'd be seeing temps over 350, and if I tried to go over 40-45 mph for a minute or two I'd see temps between 370-385 and I'd pull over to let it cool down. Since then I've put a 118 main jet in there and it's brought down the temps enough that I can run over 40mph for a couple minutes without getting into danger-range. Keep in mind this is my first time tuning a 2-stroke.
Question #1: What are normal operating temps for a 72cc AF16? Will a bigger carb keep temps down? I see most of the builds coming out of Hawaii are running a 28mm carb where I'm running a 24mm. For now I've just toyed around with the main jets from 110-118 and the 118 is still pretty hot after WOT or cruising above 35-40mph but the bike seems to still be happy.
Question #2: Is the TWH intake manifold too big for the 24mm carb? Could that have an affect on the high temps I'm seeing?
Question #3: What's next? I'm looking at a Dio ZX transmission swap to run the larger pulley on the rear and get a little bit more punch in the low-end. Other than that I see mini stroker builds around the polini corsa that look cool. What type of crank is recommended to run with the corsa?
Question #4: Liquid cooling...what's the deal? I see big-boy stroker builds running liquid cooled setups with the radiator on the front of the bike. Does anyone run liquid cooling on a corsa or mini stroker setup? Is that stupid? I'm more interested in being able to run the bike really hard for longer periods of time without overheating that I am in winning races or setting speed records, should I even be looking at this stuff?