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Discussion Starter · #1 ·
My 05 S4R has a low RPM, low speed surge.. and sometimes a hard time starting. I've cleaned the throttle bodies, it has a new fuel pump and pressure is fine.

As exbox exhaust, rexxar flash. Any potential ideas?
 

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Do you mean you cleaned the throttle body throats or everything ? Have you run some injector cleaner ? You don’t mention spark plugs, everybody needs them sooner or later. Don’t change the plugs until after a tank of injection cleaner as the crud will end up on the new plugs.
 
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Don’t dismiss the fuel. Try a different gas station.
 

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give it a strong dose of injector cleaner and a good thrapping. then closing clearance, tps set up, throttle body set up / idle mixture is where i'd start.
 

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Discussion Starter · #6 ·
Don’t dismiss the fuel. Try a different gas station.
Sage advice!

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Good call, I'm going to try and run this tank low before I refill it.

The bike was a barn find I rebuilt, I honestly haven't checked the plugs. I'll inspect them and fun some injector cleaner
 
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