Originally Posted by luckyduck
Yes I did solve the spitback by merely turning the mixture screws out 3 turns on 40-size and 2.5 turns on 42-size. The adjustment of the mixture screws will be specific to your bike, but they really make the most difference when it comes to idle and just-of-idle performance.
My bike has been running really poorly lately. Massive amounts of 'spitback' at low rpm, kept knocking the airfilters off their mounts. More than a few times i thought to myself the carbs would have to be completely overhauled, fortunately i was wrong. I found the culprit to be a clogged pilot jets. I had put off checking the pilots since I dont know of any good way to take them out without taking the carbs off of the bike, a pita in my opinion. Well not so much taking them off but I dare someone here to tell me it's easy putting the throttle cables back on, my fingers are still bleeding. Anyway, once on my bench i was able to see that the pilots were solidly blocked. A little carb spray and a very thin needle and all was good. Put it back together, fired up and runs like new. Man, the things I learn messing with this bike.