Help busa running crap.

[BusaJim]

Really having a hard time with my bike (K3 Gen1).
After tearing the engine down for a second time due to issues with valves, my bike is back on the road.
I've chucked in new piston rings, checked valve clearance, etc.

The bike is fairly stock with 4-1 muzzy and flapper removed from airbox and K&N filter.

Ever since I got the bike I've had issues with it running rough at low speed. Basically anything below 3k in jerks quite badly. Above that it runs fine till about 8k when the engine momentarily cuts out before cutting in again and pulling the redline.

I had the bike tuned a week ago but it's no different.

While trouble shooting, I tried 3 different stators and also installed a new regulator? Sorry if my terminology is a bit off a I'm used to working on cars. I also ran a couple more earth wires from the battery. One to chasis and the other to the engine. This made no difference.

It idles like it has a lumpy cam. I've synchronised the throttles but this too hasn't helped much.

I'm hoping someone else has come across this as I don't think I can stomach having to tear the engine down for a third time.

Have you checked that the throttle valves are in sync or maybe the vacuum hoses connected up right.