,but even with the carbs balenced,the left pipe is defently not working as hard as right,if you warm the bike up to 60deg,the right side exhaust gas does feel warm,but left is noticably colder,i spoke to mr howl who used to owen bike and he did say left/frount barrel did have a miss,they dinoed it and was fine when runnig/working, and when i took barrels off the frount barrel/piston was imaculate it was top barrel that seized,
do the air screws need adjusting,and were should they be[turns] to run safe,
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NSR250 MC18