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  1. #1
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    Reading plugs on 2 stroke

    How do you read the plugs on a 2 stroke? I have a recently rebuilt (pistons, rings, rebored cylinders) 94 Montego with a 640 engine. The mag side plug is dry and the pto side is wet. Which one is right? With a single carb how can they be different? Compression is still good (130 - 140 psi), but ski is bogging and won't take the throttle. Any ideas?

  2. #2
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    Re: Reading plugs on 2 stroke

    If you have a single carb and it is clean and set to the same settings as it once ran well with then the carb may not be the problem. Could be a broke reed pedal from being hydro locked or a bad spark plug, plug boot or coil?

    http://www.pwctoday.com/f34/carb-tuning-62278.html
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  3. #3
    I dream skis engr146's Avatar
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    Re: Reading plugs on 2 stroke

    Last edited by engr146; 10-26-2009 at 06:42 PM.

  4. #4
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    Re: Reading plugs on 2 stroke

    engr146 - thanks for the great reference document. A great discussion on the theories of tuning 2 strokes. Being an engineer myself I can appreciate this kind of detail.

    dank - engine was running well before it started losing power. Ignition appears to be ok, but will try new plugs. Reeds are ok as well. I assume the plugs should be dry, not wet. Could it be a vacuum leak? I'll be pressure testing soon.

    Thanks.

  5. #5
    PWCToday.com Is My Home Away From Home PrickofMisery's Avatar
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    Re: Reading plugs on 2 stroke

    The plugs should be dry and a nice even toasty brown color.

    However to get a correct reading the motor must be operated under load and at high RPM then shut down. Reading plugs after running on the hose or idling in th driveway is not a accurate indication. With that being said in any case one should not be dry and the other wet.

    EDIT- Not the best chart but you get the idea
    Attached Images Attached Images
    Last edited by PrickofMisery; 10-26-2009 at 11:06 PM.
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  6. #6
    PWCToday.com Is My Home Away From Home PrickofMisery's Avatar
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    Re: Reading plugs on 2 stroke

    http://images.google.com/imgres?imgu...%3Den%26sa%3DG
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    Last edited by PrickofMisery; 10-26-2009 at 11:12 PM.
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  7. #7
    I dream skis Krispy's Avatar
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    Re: Reading plugs on 2 stroke

    Quote Originally Posted by engr146 View Post
    Great bit of reading! Thanks!

  8. #8
    PWCToday's first Tigershark owner Moderator
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    Re: Reading plugs on 2 stroke

    Yeah, good illustrations.

    I winterized my 1100R yesterday and i checked the plugs and damn, they are abso-freakin-lutely perfect. I love my motor.
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  9. #9
    I dream skis engr146's Avatar
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    Re: Reading plugs on 2 stroke

    THX ,for sample sheet,I'am a power plant engineer,I can rebuild a steam turbine,But I have a long way to go understanding 2 cycle engines and troubleshooting them,I have learned so much from this forum.and learn more everyday!!


    Quote Originally Posted by gizmoe107 View Post
    engr146 - thanks for the great reference document. A great discussion on the theories of tuning 2 strokes. Being an engineer myself I can appreciate this kind of detail.

    dank - engine was running well before it started losing power. Ignition appears to be ok, but will try new plugs. Reeds are ok as well. I assume the plugs should be dry, not wet. Could it be a vacuum leak? I'll be pressure testing soon.

    Thanks.

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