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    1985 yamaha 90 hp 2 stroke 3 cylinder outboard surging at full throttle

    Hi, I'm about at the end of my rope with this....Motor was running fine, no problems known. I launched the boat , started and idled out of the no wake zone and when I pushed the throttle down, the motor stuttered and shook back and forth. As soon as I took it back below 1000 rpms it ran good...
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