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    How does Yamaha timing advance?

    2001 VMax VX150TL with EFI on 2002 Skeeter SX190 Son's boat. Bought it new. Said motor idled fine but on last day of BASS Elite tournament following KVD, would not put Skeeter SX190 on plane. Was in heavy rain so I thought from the beginning it was fuel related. He changed spark plugs but...
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