I reuse those o-rings all the time. If you need parts, its probably easier to get them for a Yamaha 90(same power head) Clean the needles and seats. IF you don't have a vacuum gauge set up, don't try to do it without one. They are very finicky. Dont use harsh chemicals to clean them( I use an ultrasonic cleaner). I you carry it to a shop, be prepared for sticker shock. BTW, those carbs are $700 each new.
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