Hey forum'ers, I recently bought a non-running 1980 XS650 and have been bringing it back to life. First of all I want to say that this place has been extremely helpful for getting informed on all aspects of the bike, and most problems I've encountered there is usually a thread with great advice. So thanks to all of you for sharing! The bike i purchased was sitting in a garage for almost a decade. It has great compression (140psi in both cylinders) and a new battery. I pulled apart the bs34 carbs and followed the carb guide on this site to clean everything out, and check all the screws (everything in the carb is stock). After re-assembling i got the bike fired up, and after tweaking the mixture screws (both currently sitting around 3 turns) it idles fine with the choke off. Now to my current problem which i was hoping to get specific advice on: I took the bike out for a ride around the neighborhood and when i'm in the 1/4 throttle range 1k-3k rpm, the bike surge's and bucks as if the motor is cutting on and off. Once i pass 3k it opens up and pulls smoothly (sounds great too). After parking the bike i tested the exhaust headers with water and while both are hot the right side cylinder is much cooler then the left. Furthermore, there seems to be fuel leaking from the pilot air screw passage on the right side carb into the airbox. The fuel leaking will stop when i lean (screw in) the mixture screw on that carb, however from research it sounds like the cylinder running cooler is due to an already overly lean mixture, so theoretically i would want to enrich it? Not sure if these two issues are related but any advice would be much appreciated. Thanks for reading!