Aerox Problem with ZX exhaust 49cc

Hello,
Setup is:
Currently: 3.5g rollers i swap with 4.3g rollers that came with the Exhaust
Clutch springs yellow, which came with the exhaust.
I have not changed the torque spring.
12mm carb with 62 main jet, i have tried 68 main jet it starts leaking out of the carburetor pipe.
I put the carburetor air intake on 2.5, tried with 1.5 still same problem.


Sometimes it is okay when the weather is better and it depends when the scooter wants to start off good, mostly it's a problem which you can see in the video. I have the acceleration on 100% as you can see it does not move off fast. It also works great when the engine is cold.
Video: YouTube video no longer available

By the way the red light is on because the fuel mixture is half way left, which is nothing to do with the problem.


My clutch bell looks like this, i don't think it looks right by just looking at it's shape it looks messed up.

The outside of the clutch bell doesn't matter, the inside should be nice and shiny and smooth.
Dump the 12mm carb and fit a 17.5mm dellorto

Stevep said:

The outside of the clutch bell doesn't matter, the inside should be nice and shiny and smooth.
Dump the 12mm carb and fit a 17.5mm dellorto

what main jet should i put on the 17.5mm dellorto?

No single answer for that question. There is no standard jet size. You have to buy a couple of jet packs and start playing, start with the biggest jet (100) and work down through each jet until you hit the right one. Keep the jetting on the rich side ( a nice dark ginger is good on the plug colour) and you shouldn't seize the piston.
If you haven't jetted before I suggest that you ask the help of someone near to you who has, patience is a virtue and you need it when jetting a carb.