So.
I'm going to try bigger pilot jets to see if that helps with the stuttering / smoothen out the revs low down.
Just checked over my carbs and there are no markings at all. Only has mikuni on the top plates / diaphragm covers. Here are some pics of said carbs.
What carbs do I have - xs650
What carbs do I have - xs650
What carbs do I have - xs650
I've pulled the pilot jet out as well - couldn't get a good picture though. It has solid sides and just an opening in the end. When I looked there's a couple of different kinds, some with holes all down the body, which I think wont fit.
Pilot jet also has a 25 on the side of it, which is the size I guess. What size would be best for stage 2? Straight through pipes and pod filters?
Cheers!