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  1. J

    low compression=low rpm

    I have a 71 9.5 johnson. I have to advance the magneto to carb adjustment or it sputters. With that timing advanced, it runs ok, but only about 3000 rpms. The compression test out at 50 on both cylinders. I have a good spart( at least 1/4"). It is on a heavy 16 foot aluminun boat with a lot of...
  2. J

    I have to advance timig on 9.5

    I have a 71 9.5 Johnson. Compression is 60 on both cylinders on my gauge. I have good spark (1/4 inch test). I have to set the carburator so that the timing is advanced to run good, otherwise it will backfire. Consequently I don't know if I am getting the best of my motor. Any suggestions would...
  3. J

    Im having trouble timing my 9.5 Johnson to my carb

    My 9.5 Johnson spits and backfires on the bottom cylinder when I time the carb to the mag according to specs. I have to advance the timing in order to stop backfiring. Any help?
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