Installed new EV3 Andrews cam and 42mm Mikuni carb.Installed carb first ran great.Installed cam runs strong but popping air back threw carb @ idle could use some info!!

 

Hate to say it but it sounds like the the cam is not timed properly.

Check cam timing.


David

 

I have to agree with breaknbad, prob one tooth out on the cam timing.

 

I'm sure I checked the marks 3 times . I sure the marks lined up perfect.I have good compression in both cyl.Could it be a bent valve or weak spring.i guess I pulling it back down to ck the marks,one more time.Any other way to tell for sure.

Ken