Join Date: Aug 2011
Location: Macomb County, Michigan
Sputting really bad at high RPM.
I am having an odd problem with my bike. It starts up instantly, idles fine, and rides like a dream through all the gears as long as I stay under 4000 RPM.
Right about 4000+ RPM it starts sputtering real bad, and at 5000 plus it gets downright terrible where I can feel it shaking and sputtering if I try to ride on the expressway.
If I give it full throttle, either riding or parked, it will accellerate smoothly and cleanly until it hits around 4000+, no problems at all.
It does have the "ears shaved" as I believe it is called. The stock air boxes are off and there are just some small round filters over the intake ports. The previous owner also punched out the baffles, so it actually sounds great.
After some discussion with the local bike shop, he said it probably needs re-jetting. Does that sound right?
Also, if I return it to the stock air boxes but leave the baffles punched out for sound, do you think that would help or do I need to buy a new stock exhaust pipe?
Thank you for the help.