Please help me identify this engine. (1997 Waverunner/WaveVenture)
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  1. #1
    PWCToday Newbie
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    Aug 2018
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    Texas
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    Please help me identify this engine. (1997 Waverunner/WaveVenture)

    Hello everyone,

    I just purchased either a '97 Waverunner III or WaveVenture 760 on the cheap as a fixer-upper and am getting conflicting information on what engine it has. (701cc or 760cc) It may have been modified by a previous owner or by a rental joint so engine may not be stock.

    Here are the numbers I've found:


    Hull tag: YAMA2321F797

    hulltag.jpg

    Flywheel plate numbers:

    yamnumbers.jpg

    Head cover numbers:

    head.jpg


    I'm almost certain this is a 760cc motor but an engine swap site assures me that '64X' stamped on the head cover indicates a 701.

    Any help is much appreciated! Oh, forward piston has zero compression. #2 has a healthy 150 compression so I'll be tearing this thing down soon for a rebuild.

    Thanks again

  2. #2
    PWCToday Newbie
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    Aug 2017
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    Washington
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    7

    Re: Please help me identify this engine. (1997 Waverunner/WaveVenture)

    760

  3. #3
    PWCToday Newbie
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    Aug 2018
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    Texas
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    Re: Please help me identify this engine. (1997 Waverunner/WaveVenture)

    Quote Originally Posted by cheechmo View Post
    760

    Thanks! If it was the 64X that gave it away, confirmed.

    64x.jpg

  4. #4
    PWCToday Newbie
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    Aug 2018
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    Texas
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    9

    Re: Please help me identify this engine. (1997 Waverunner/WaveVenture)

    Pulled the engine and crankcase had a large hole in bottom. Either that was one huge detonation or the PO replaced a piston and didn't bother to check the lower.

    Have a reman on the way from SBT. Bought a crankcase on Ebay to send them to avoid charge.

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