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Compression

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  • Sebago13
    started a topic Compression

    Compression

    Would anyone know what the compression should be for a 1971 20hp Johnson. 20R71S

  • Bosunsmate
    replied
    Originally posted by jimmbo View Post
    I see a lot of German, Japanese, and especially British Engineering that is Cracked
    I may have too, but at the time I probably considered it a misprint!

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  • jimmbo
    replied
    I see a lot of German, Japanese, and especially British Engineering that is Cracked

    Leave a comment:


  • Bosunsmate
    replied
    Ahh interesting, "cracked" in that sense seems to be an exclusive North Americanism

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  • jerryjerry05
    replied
    The comp readings: as long as they are even or real close.
    Different gauges read differently.
    Harbor Freight sells JUNK and they don't give the right readings.

    Leave a comment:


  • racerone
    replied
    Exactly----If coils are cracked then it likely has not been used for many years.-----Most likely then a low hrs motor.-----I see that all the time !!-----I have many new coils on hand here as it is a very , very common thing.

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  • lindy46
    replied
    Cracked means original and it probably hasn't been used for years and is most likely a low hours motor.

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  • Bosunsmate
    replied
    Originally posted by racerone View Post
    There are many , many of these motors around that have hardly been used over the years.------Some spend much time in proper storage.----Used for just a few hrs every year.----If you just bought it remove the flywheel to check the coils.-----Bonus if you finfd them cracked.
    Not sure why you would want them cracked, didnt think they were like walnuts but am here to learn too

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  • racerone
    replied
    There are many , many of these motors around that have hardly been used over the years.------Some spend much time in proper storage.----Used for just a few hrs every year.----If you just bought it remove the flywheel to check the coils.-----Bonus if you finfd them cracked.

    Leave a comment:


  • Sebago13
    replied
    Originally posted by flyingscott View Post
    anything above 100 is good above 120 is great
    How does 130 sound...both cylinders

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  • Sebago13
    replied
    Thank you very much!

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  • flyingscott
    replied
    anything above 100 is good above 120 is great

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