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yea it sound lean on the pilot circuit or sync is off i wouldn't re jet i would first pull all the jets out and clean them thoroughly then set the float and install inline filters once its running syn the carbs and set idle mix screws if you still have a problem once this all of this is done...
if you can make several marks on either side of where its currently set and with a light set it further retarded until it runs quite bad then slowly advance it until it runs good test ridding hard between each change and this should get you in the ball park also put new pugs in and check for...
pull the carbs off sync them with your eyes put em back on and then sync them by exhaust sound no more than 1/8 of a turn and this should get you really close remember that the idle mix screws can provide different amounts of fuel with the same setting so if there both 1 1/2 turns out that...
rev it a bit like 3k ish when you check it you need between 13.8 and 14.5 ish volts to properly charge your battery no more than 14.9 or you can cook the battery:thumbsup: