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Thread: plug reading?

  1. #1
    steach's Avatar
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    plug reading?

    Four hours after removing VF3 stuffers I fouled a plug (PTO) for the first time. I lost about 100RPM (but the humidity was up ~20%). -see pic(aligned left to right; mag, cntr, pto).

    Q: the compression is down ~5PSI in the PTO jug. Was this a fluke bad spark plug or do I need to look for a gasket leak?
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  2. #2
    It sounds like a possible reed gasket leak to me. Did you use grease or anything when you reinstalled?

  3. #3
    steach's Avatar
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    Quote Originally Posted by porksword View Post
    Did you use grease or anything when you reinstalled?
    NO, it was not my best work. I just hope I find/found the problem before big damage occurs/ed.

  4. #4
    injected2stroke's Avatar
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    If you are running a factory head I think the PTO CYL is 5 lbs. lower. And the humidity will make a huge difference. GPHOTROD is having a similar problem with RPM's right now. He dropped 90 to 100 rpms over the weekend and I dropped about 50 with the humidity up about the same here 20% from last week.
    Last edited by injected2stroke; 07-31-2007 at 04:45 AM.

  5. #5
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    Quote Originally Posted by injected2stroke View Post
    If you are running a factory head I think the PTO CYL is 5 lbs. lower.
    The PTO was 5lbs lower than #2. Now it's 10lbs lower.

  6. #6
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    Factory it is about 5 lbs. lower than No. 2 . But if it is 10 lbs. lower you may have something going on. Actually I think factory spec shows the #1 and 2 cyl. to have the highest compression followed by #3 is the lowest. If you are running after market heads these readings could be different depending on which heads you have.
    Last edited by injected2stroke; 07-31-2007 at 02:41 PM.

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