Well this is my first posting. I've been browsing TT ever since I got my bike one year ago. I think this is a great site and have learned tons. Thanks to all of you! On to the problem... The bike is a well worn (cosmetically) 92 XR600R. I believe it is stock except for a SuperTrapp exhaust and Uni air filter. When I got the bike it was spitting oil out of the exhaust - literally. I put in a new (.25mm over Honda) piston and had the cylinder rebored to match. That took care of the oil spitting problem. While I had the top end off, I lapped the valve seats because the were somewhat pitted. After that I'm having a lot of trouble getting the bike started. When I do get it started, it runs really bad a low rpms (I have to continually rev it to keep it started). When I take it out for a test ride it runs rough and "surges" under constant throttle. I took the bike to a local Honda shop and they cleaned the carb and verified the jetting but that didn't do a thing (at least they didn't charge me for the "work"). Here's what I've done to try and figure this out: - Changed out the gas (worth a try) - Spark has tested good - Timing has been triple verified - Valve adjustment also triple verified - Air filter is clean - Plug is new and properly gapped Any suggestions would be greatly appreciated. I see how passionate you all are about this bike but I have just had some really bad luck with it...Make me a believer!!!