Hard to adjust carb with 72cc kit

[Deleted]

Hello

Last summer, i install a 72cc kit on my Kymco 4 stroke.
I have the original air box and original exhaust.

The motor run good, but it,s very hard to adjust the carburetor.
When the motor is cold, it's start #1, but when it come warm, he didn't keep the idle speed....

I adjust the mix screw when the motor is hot, but after a ride idle going down, down, down and die...

Hep me! :ambulance:

If i didn't find the stupid adjustement, i'm going to put back the 49cc kit! :lol:

Thank's!

The main jet is #90, pilot jet #38

[Fox]

Turn the idle speed screw to the right when it's hot.



Have you done a valve adjustment?

Here's a guide for that:

[tomcas]

38 idle is too big. I know, it's the stock Kymco for the 50 but I think even 35 is too big for the 72. For giggles try a 30 idle, and 88 main.

[Deleted]

Today i install pilot jet #35 and main jet #85.
It's better, i adjust the valve at (.002 intake) (.003 exhaust).
The acceleration look stronger and i didn't feel the lack in acceleration.