head gasket leaks

  1. P

    tachometer only rev up to 3000 max and engine rebuilt twice and still leaking under the spark plug

    i have a 1977 xs 650 and the tachometer is only reving up to 3000 no more, engine is running well.i just bought a new 650 tachometer and i have the same issue, the drive is working, cable is new,and the rev tacho too, but still not reading the rev properly? another issue is the engine is running...
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