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Title: Compression test Post by: alibaba on October 26, 2011, 04:10:48 PM 1969 M696 - I am going to take a compression test. With this ignition system is it crucial that I ground out the spark plugs while turning the engine over? I know that some ignition systems can be damaged if the plugs are not grounded.
Title: Re: Compression test Post by: Howie on October 26, 2011, 07:29:00 PM You need to either ground the plugs or disable the ignition. The fuel pump should be disabled too.
Why are you doing a compression test? Title: Re: Compression test Post by: WTSDS on October 27, 2011, 01:47:06 AM Dunno about the 696 but my Monster has separate fuses for the ignition and fuel systems. Pull both, and trusting that you know the throttle should be fully open for testing.
1969 M696 - that's a VERY early one, got some pix ? Title: Re: Compression test Post by: alibaba on October 27, 2011, 06:54:20 PM 1969 M696 sh read 2009 M696 - sorry for triple typo guys. This head cold is making me ditzy.
I always hold the throttle wide open. I make it a general practice to take compression tests on most of my toys just to have a base line. Thanks all for the input. FWIW - I got 170 psi on the vertical and 160 psi on the horizontal. Sound about right with 4,000 miles? Title: Re: Compression test Post by: Howie on October 27, 2011, 08:22:48 PM Yup, excellent!
Figured it was an '09, in fact I didn't even catch the mistake. So, why the compression test? Title: Re: Compression test Post by: Langanobob on October 27, 2011, 10:46:04 PM Yup, excellent! Figured it was an '09, in fact I didn't even catch the mistake. So, why the compression test? Howie, if you read his post [cheeky] He says "I make it a general practice to take compression tests on most of my toys just to have a base line." A good practice I might add. Bob Title: Re: Compression test Post by: Howie on October 28, 2011, 02:16:24 AM Missed that :-[
Yes, it is a good practice. |