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Back Fire On Lift Off?
Guest posted a topic in EngineHi, Just stripped and cleaned my ZX-9R carbs and replaced the float valves. All floats to correct height. Now I get a lot of back-fire when I lift-off the throttle - and the engine idles fairly lumpy - I assume this is a fuelling issue, but what could be causing it ? Fuel mixture screws all at 3 turns each, 160 main jets, needles raised with two M2 washers each, idling at 850 rpm when warmed up. Is it too rich or too lean... how would I check and how would I adjust ? Do I need bigger jets ? Thanks for any suggestions !