Question about 2005 Yamaha YZF-R6

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Engine lugs when the throttle is opened

For starters, here's what has already been done. I have replaced coilpacks, plugs, all fluids, fuel, had the throttle bodies calibrated at dealership. Now, my bike hesitates horribly when I open the throttle. and it got warm the other day (over 220) and would accelerate at all. With the clutch in it seems to rev freely, but lugs under any load. It doesn't smoke so I don't think there is any problem internally (i.e. piston rings, etc.)

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Hi Josh
Sounds a lot like you are running lean... running hot, stumbles when you roll the throttle on. For starters,

  • has it always been this way for you or is something that has just started happening
  • have you changed any parts... air filters, exhaust
  • when did you last run some injector cleaner additive through the bike.
These bikes are setup to run somewhat lean to begin with from factory to comply with emission control standards. Be careful if it is running hot ... if it is leaning out for some reason(will cause it to overheat also), you can destroy the engine, blow holes in pistons, burn valves... all manner of things. If you have changed any intake/exhaust parts, then you may need to have the fuel injection re calibrated to pick up on the extra flow/performance these parts provide. Altering anything in this manner will impact the fuel mix/tuning of the bike.
I would suggest running a cleaner through the system initially. Gummed up injectors will cause it to run lean for sure.
regards robotek

Posted on Apr 26, 2010


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