Ok,
I've jetted with the largest mains Dynojet had in their stage1 kit.
They didn't seem to be that much larger than the stock mains but I know the needles are tapered more.
So I still have this stutter at 1800-2000 rpm, even under no load.
You can just hold it there and it's not happy at that rpm.
I'm thinking maybe carb sync so that's gonna happen real soon, but just wondered if this was another gliche?
PS; bike runs like a raped ape now, even warms up quiker.
Revs freely thanks to the springs Dyno supplied.