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All of the above and a couple of more things. Ensure your fuel line bulb is pumped up tight while running. One hook in the gas line will cach air without leaking.
Fyi, after solving your problem-My Yamaha 40 on my older skiff has run great for 10 years, however is oil sensitive. It wont idle properly with cheap oil. I run only Yamalube or quicksilver. Ididnt believe it but made drastic difference and all my idle issues went away.
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