---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Tue 08/22/06: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:39 AM - Re: RPM drop Problem (Michael) ________________________________ Message 1 _____________________________________ Time: 07:39:56 AM PST US From: "Michael" Subject: RE: Engines-List: RPM drop Problem --> Engines-List message posted by: "Michael" >The timing may have slipped on one mag. That was the first thing to pop into my mind, everything else being checked. Are the mags new or recently overhauled and reinstalled? Sometimes things can shift. It would be unlikely for a Woodruff key to be missing, but not impossible. This would allow a gear to shift. You may have to pull the mags and check them out, as well as to make sure they are installed with the timing mark in the correct place on the drive gears. It would be odd for this to be it as it sounds like it just started after being normal for a while. Something has moved out of place, most likely in the mags or gear drive. I recently put in a new set of ($20 each) spark plugs only to find after about 20 hours one was faulty. Have them pressure checked. If they are leaking, you can see blow-by gas products in the wiring harness end of the plug. Michael