John wrote on 07/18/12 at 18:22:36:Routy,
It backfired quite a bit when decelerating and downshifting. It is my understanding that the "spacer mod" would fix that. Now I have other problems....
Thoughts?
Despite what you mite have read here, IMO, there is no fix for backfiring on decel or shutdown,....not that it can't be lessened a bit by the air and throttle stop adjustment on the carb. Many here have hacked carbs strictly to try to stop the backfiring, and many have not only failed, but ended up w/ more problems than just backfiring.
I did the spacer mod on mine only because I has a lean (surging) condition in the low to midrange throttle position,.....and it fixed that near perfectly. If you didn't have any problem in that range, you are possibly running rich there now, which may or may not be causing a problem now.
I can assure you that the mod didn't change the backfiring one bit, nor did I expect it would. And I have read of some that did the spacer mod, then reversed it back later.