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Discussion Starter · #1 ·
what are the signs of running rich or lean(other than the sparkplug) in the low,middle,and top end......ive done a bunch of searching but it doesn't answer this question..the reason i ask about the low,mid,&top is the stealership has the yosh box but no dyno


thanx in advance
 

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Discussion Starter · #2 ·
nobody can help...cmon somebody..............its a 99 gsxr750 with a full 2bros exhaust if it makes a difference
 

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All this is from tuning a carbed bike, so I don't know how it translates to FI. If it's lean at idle, when you blip the throttle, it may hang a bit and drop back to idle speed slowly. Rich it drops immediately below idle speed, and rises back up. Mid range and cruise, read the plugs is the best way. If its surging while cruising at high rpm, it's lean. At lower rpm (~4000) if it surges, it may be rich. Read plugs here, that's the easiest way to tell. It's hard to tell if the bike is lean up top, except that it will not pull as hard because it's starving for fuel. If it pulls hard when cold and then doesn't pull as hard when warmed up, it's rich. If it pulls a little better when warm, but not as good when cold then it may be lean.
 
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