What is the size?
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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