I have had like flat spot in about 2800-3000RPM it works smooth under that and over that. but if I hit that magic rev zone bike will start to stumble/sputtering.. it feels like.. hell not sure.. if you rev fast from idle to higher RPM range its ok.

If I just rev engine and try to hold it 3000rpm you can clearly hear exhaust making sputtering noises.

but it's not stick coils as I did try different ones already,cleaned the tank pump.. lots of rust btw... :/

It also has new fuel inside (as I did run it empty by accident, if bike can't hold idle.. do check before taking tank off that there is fuel in the tank.. )



This problem has been already long time and really start to annoy me only if I am in traffic and have to hold that speed :) really hate that sound and jerkiness of the bike at that moment.