Thank you to this forum for all the advice everywhere! Have one last question, the carb is all stock e.g. 125 & 128 . How can I get the airscrews close to perfect without dyno and gas analyzers? I would assume the top cylinder would require little less air. I also feel when closing the throttle the revs would sit at 3000 for 2 or 3 seconds and then drop to +-1500. I think one of the cylinders may be to lean?