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  1. #1

    Default yamaha vmax 200 HPDI compression

    I have a Yamaha Vmax 200 HPDI outboard. Wondering what the compression should be on it? I am getting
    between 90 and 95 psi per cylinder. This seems low to me but the motor seems to run ok other then a slight miss.

  2. #2
    Join Date
    Jan 2012
    Giessendam, Zuid-Holland, Netherlands, Netherlands

    Default Re: yamaha vmax 200 HPDI compression

    If all cylinders are equal, it is fine.

    Slight miss is also acceptable, these engines run like normal 2-stroke engines (not as a E-tec or a 4-stroke).

    You could install new spark plugs and decarbonize the engine with Engine Tuner (Evinrude)/Power Tuner (Mercury), that could help a lot if carbon is the issue.

  3. #3
    Join Date
    May 2011

    Default Re: yamaha vmax 200 HPDI compression

    120 is better. If you aren't running Yamaha RING FREE I would start. Possibly even do a shock treatment. Those motors run on 4 cylinders in neutral so that may be your miss but otherwise throughout the rpm range you should not be missing unless there is a problem. You may have some intermittent spark plug bridging when you start with the ring free but that should clear up as the motor cleans up.

  4. #4

    Default Re: yamaha vmax 200 HPDI compression

    Super low compression unit. I have a pair on my 28 Bertram. The only thing that is high pressure on a HPDI is the fuel rail pressure. Thanks Martin Yes PRBMAN is correct with his ring free. I would also be running Seafoam, your unit will loveit and you cannot overdose it.

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