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Thread: Johnson 40 hp mods

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  1. 08-19-2014 #1
    Kevodaniel
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    Default Johnson 40 hp mods

    I have a 99 40 hp johnson converting it to a 50 if I put a 50 hp head on it will it raise or lower the compression or do I need to have the head milled to sst 45 spec what's y'all opinions thanks for you help
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  2. 08-19-2014 #2
    LittleCharger
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    Quote Originally Posted by Kevodaniel View Post
    I have a 99 40 hp johnson converting it to a 50 if I put a 50 hp head on it will it raise or lower the compression or do I need to have the head milled to sst 45 spec what's y'all opinions thanks for you help
    Look at post #60 of this thread

    http://www.boatracingfacts.com/forum...ght=#post98945
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  3. 08-19-2014 #3
    Kevodaniel
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    Quote Originally Posted by LittleCharger View Post
    Look at post #60 of this thread

    http://www.boatracingfacts.com/forum...ght=#post98945
    Is there any way to adjust the timming accurately I'm assuming it would be better to mill the head to sst 45 spec thanks for the help
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  4. 08-19-2014 #4
    LittleCharger
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    Quote Originally Posted by Kevodaniel View Post
    Is there any way to adjust the timming accurately I'm assuming it would be better to mill the head to sst 45 spec thanks for the help
    Timing light for timing is the only way

    might as well go to 45 spec so long as milling a 50hp head
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  5. 08-19-2014 #5
    Kevodaniel
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    Ok do you know sst 45 spec
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  6. 08-19-2014 #6
    Kevodaniel
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    What's sst45 spec
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  7. 08-19-2014 #7
    LittleCharger
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    Quote Originally Posted by Kevodaniel View Post
    What's sst45 spec
    http://www.apba.org/sites/all/files/...TION041013.pdf
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