Thread: plug reading?
07-30-2007, 06:22 PM #1
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?
07-30-2007, 06:49 PM #2
- Join Date
- Jul 2006
It sounds like a possible reed gasket leak to me. Did you use grease or anything when you reinstalled?
07-30-2007, 07:10 PM #3
07-31-2007, 04:41 AM #4
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.
07-31-2007, 09:42 AM #5
07-31-2007, 02:23 PM #6
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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