Quote:
Originally Posted by steplift20
Crazy title isn't it but this is what I'm talking about
I just ordered a engine compression tester from Amazon and the fittings are in metric, I'm going to test my sons 250 Yamaha for compression.
Are the spark plug threads in metric? What size do I use? It also comes with a universal rubber cone shape fitting that should work when you hold it tight to the spark plug threads but I would feel more comfortable using the screw in adapters .
Thanks for any info.
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Take out one of the spark plugs. Compare the threads on the plug to the adaptors. One of them should be identical. That's the adaptor to use. (Lay the adaptor threads next to the plug threads so they touch. The threads of the proper adaptor should mesh perfectly with the spark plug threads.)
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
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