[shspvr]

Originally Posted by jkv45

So the problem is when holding a consistent throttle position and RPM only?

If it ran the same before and after carb work, it could mean you didn't correct the problem when you were in the carbs.

No after the head swap

Originally Posted by jkv45

Looking into the carbs from the airbox side, are the collars/needle jets protruding up into the venturis?

Collars/needle jets (silver pieces on the left) - https://faq.ninja250.org/images/e/eb/Jim_carb_2.jpg

Yes I'm ware of how collar need to be install with concave install first and convex seat match to jet holder end