Went for a ride. Well tried to.
Not enough carb. It will idle. But as soon as you try to give it any throttle under load it just boggs. Tried moving the main jet needle up and down a notch. Worse.
If I feather it and limp it into the main jet, holy cow! This engine woke up. It runs like crap and I can tell it's got more beans.
I need to adjust the slow jetting. I don't have any jets for this carb so nibbi , here comes my order.
Now just to decide flat or round slide. The flat is more tunable but it's also costs a bit more and I don't see a flange mount style.
The round type has a flange mount up to 28mm. The 30mm goes to a slip fit. I'm thinking just go with the 28mm flange. If it's a little under carbed I don't think it will hurt performance too bad. I'd rather be slightly under sized than over. Faster air velocity makes better fuel atomization.
The nibbi pe28mm carb flange version is compatible with 250cc-300cc engines. After our test, you can upgrade or replace it successfully with just a few adjustments.
nibbiracing.com
Or
24mm,26mm,28mm,30mm,32mm,34mm,36mm,38mm,40mm.
nibbiracing.com
It look like Denny is the only one paying attention in class.