Need help. Just bought it and it runs on both cylinders when revving it up in the garage, but under load down the road it does not run well in that it's "garbling" and unable to attain a clean crisp engine sound or powerband. I am a bike mechanic but new to the NSR250. Anything to look for? Overhauled the carbs but no change. Do the jet needles wear out? Could not see any sign of wear on the needles. Thinking of replacing the nozzles (emulsion tubes) but want to consult here first.
Thanks
John