I rode my 1988 KX 500 engine today, and the jetting seems very lean. The motor stumbles and just seems generally unhappy, though it idles and starts well. The motor has been bored to 88 mm, has a Wossner forged piston, 89-up CR 500 pipe, stock carb, and stock ignition in the middle timing setting. What do you guys suggest for main jet, pilot jet, needle jet, needle clip setting, etc? I'm pretty far out of my element, and I'm not even sure where to start now that the motor is bigger. Any help would be appreciated. Thank you!