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Discussion Starter #1
Hi all. I need help.
The long and short of it is I've turbo my zzr1100 but putting that aside.
The problem I have is before I started the bike was fine. Now I have a popping or back fire from the carbs on idle WITH OUT the boost hose connected. So no boost.
This tells me I have a lean mixture but my A/F ratio is RICH? What am I missing.
Can a rich mixture cause this???
Thanks..
 

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Check timing, vacuum leaks and valve clearances. If an intake valve is just slightly open during the firing stroke it can spit back thru the carbs. My 900F did that and it ended up being a burnt valve.
 
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