only let true carb tech work on these carbs.they are very detailed items.i have this bike.my mech.tore them down completly.the carbs actually had parts missing.he replaced and repaired them and now it will go past 50mph in first gear.just gas and ride no problems.expensive but %!ยค mechanics couldnt fix it.it went to three different shops and when they all got thru they had ruined my bike!