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Ghostt, I see your logic. but what about any differences in the two cylinders? would the vacuum sync have any benefit over the bench method? I could see the vacuum method helping to even out the two. next time I have some free time, I will pull the air filter and set the butterflies with a feeler gauge. it may not have even needed a sync, I didn't remove the carbs from the rack when I went through them. thanks for your help.