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Yamaha motors are usualy trouble free, so for now, assume it's not the motor. I would remove the anti siphon valve at the tank, either punch out the ball or replace the fitting. It looks like a standard threaded hose fitting but has a small ball bearing that stops fuel from siphoning out if you have a broken fuel line. We have had problems with the ball sticking and the motor running out of fuel. Then change the fuel primer ball in the fuel line. Make sure that it has a slight angle up at the motor side when installed, so the ball inside seats properly. Only use a major motor brand not an aftermarket one. After this, the motor should be checked by a qualified dealer.
Dick
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