Yamaha RA700T 5 mph slow speed
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  1. #1
    PWCToday Newbie
    Join Date
    Aug 2015
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    Michigan
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    21

    Yamaha RA700T 5 mph slow speed

    Hello,
    I was here a couple of years ago...
    Since then i rebuild the carbs and last year the ski was running great.
    This year its max speed is like 5 mph.
    I didn't touch anything.
    What could be the reason for the slow speed???
    TIA.

  2. #2
    PWCToday Newbie
    Join Date
    May 2016
    Location
    Tampa, FL
    Age
    30
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    11

    Re: Yamaha RA700T 5 mph slow speed

    Is the motor accelerating? Or is it running rough and not doing much when you hit the throttle? If the motor is running rough and not accelerating Id say bad gas from sitting for too long if its been sitting since last year.


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  3. #3
    PWCToday Newbie
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    Aug 2015
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    Michigan
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    Re: Yamaha RA700T 5 mph slow speed

    Thanks!
    The idle is smooth and been on idle the ski moves forward slowly [as expected]
    Regardless if it is a slow acceleration or a full throttler the ski reaches 5 mph and stays there, the engine works smoothly, not rough.

  4. #4
    Frequent Poster Firebird!'s Avatar
    Join Date
    Apr 2006
    Location
    Lakeland, FL
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    42
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    156

    Re: Yamaha RA700T 5 mph slow speed

    Inspect the pump area. Check impeller in good condition, nothing stuck.

    My bet is on the splines of the driveshaft/coupler shaft being stripped.

    See if you can turn the driveshaft with impeller by hand. If you'll feel that it's spinning without turning the engine over - that's wat it is.

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  5. #5
    PWCToday Newbie
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    May 2016
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    Tampa, FL
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    30
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    Re: Yamaha RA700T 5 mph slow speed

    We need to find out if the engine rpm is increasing when he gives it throttle or not before we can even start to try and diagnose it.


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  6. #6
    PWCToday Newbie
    Join Date
    Aug 2015
    Location
    Michigan
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    21

    Re: Yamaha RA700T 5 mph slow speed

    Thank you all guys for awesome replies!
    I found a lot of weeds in the impeller.

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