OK, here's an update.
We are down to a 260 on the main (From 340) and a 45 on the pilot. It runs OK down low, and mid throttle response is decent. On top, it still smokes like a chimney and cuts out early, although maybe not quite as soon.
Things we've checked:
-Topend gaskets are good.
-Exhaust is sealed.
-RH Crank seal
-Cleaned carb a billion times.
-Took choke plunger from other carb to check, no difference.
-Good comp.
-No coolant leak from what I can tell.
The bike smells just like normal 2-Stroke (Klotz, easy to smell.) Except lots of it!!!
Just to clarify, the carb that we are using has been on the bike for a while and ran decent about a year ago, so I think that the needle and slide are OK for the bike.
Anything else that we should check? This is really getting frustrating! :eek: