Original av7 case for motobecane 40t will not fucking seal!! I’ve opened and resealed several times and cannot rid myself of an air leak. Same spot every time, just below intake (but def not intake itself).
I’ve tried sealing with no gasket, a dry gasket, gasket in 2 stroke oil maybe three different times, and finally a dry gasket with yamabond 4 spread thinly on each case half.
Is it warped? Time for new case? Just live with it? What would you do?? Next try is yamabond without a gasket but wanted to put the Q to all you fine folks before I tear it all apart for the nth time.
Performance is OK, torque is great, and I’m jetted appropriately (72ish - see bike specs below) but when I hit an incline it suffers. I live at the top of the hill so this is an issue.
SHA 15.15 w filter intact
Derestricted stock exhaust
Ported stock fast cylinder (swapped for 70cc Airsal kit, leaky case affected it exactly the same)
Le Partie CDI
Brand new seals and bearings