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'93 175 2 stroke engine hesitation

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  • '93 175 2 stroke engine hesitation

    My 21ft Grady is powered by a '93 Yamaha 175 2 stroke saltwater series which periodically hesitates between 35-50k RPMs. Last summer I replaced the fuel filter, and burned through a fresh tank of gas but the periodic hesitation with 3-4 rpm variations persists. This spring I took her out and took her gradually up to 50k rpm. She faltered a bit at 37k rpm but ran smoothly at 50k (her current max) for a 15 minute trial run. It seems that the hesitation occurs less after a minute with the engine off.
    Any suggestions?

  • #2
    Run a vacumn test on fuel system to see if there is a restriction in fuel hose or tank pickup in boat. Check fuel pump diaphrams, remove and clean carbs.
    Regards
    Boats.net
    Yamaha Outboard Parts

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