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  1. Confusing Spark Plug Threads

    Motorcycle Repair
    I recently purchased a 1977 Suzuki GS750 and I was testing the compression with good results (120psi) until I got to my third cylinder which, at it's very best, only got up to about 50psi. Fortunately (or unfortunately) I realized that there was air escaping from around the threads on my test...
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