spark knock
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Thread: spark knock

  1. #1
    Newbie
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    spark knock

    hello everyone, newbe here

    i have a 1980 xl250s that i recently put a ney piston and rings in.
    the piston was a pop top piston and now it spark knocks bad.
    is there anything i can change on the firing to help it and if so can you tell me how.


    thanks

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  3. #2
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    Did you change the compression? How is the timing set on that bike?

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  4. #3
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    retard the timing or run higher octane fuel

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  6. #4
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    yes the compression did change and the timming is set to factory , this all new to me. if it were a briggs it would be no prob, but a little different for me

  7. #5
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    i am now running premium and it helps a little

  8. #6
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  9. #7
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    Quote Originally Posted by cbailey View Post
    yes the compression did change and the timming is set to factory , this all new to me. if it were a briggs it would be no prob, but a little different for me
    then retard the timing by a bit. no idea by how much you'd need to do that, so just do a bit at a time until it goes away.

  10. #8
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    Quote Originally Posted by GregR1 View Post
    then retard the timing by a bit. no idea by how much you'd need to do that, so just do a bit at a time until it goes away.


    That's really your only option.....since there is no way now to drop the compression back down. The fact that hi-octane fuel helps pretty much proves this. In some parts of the country, hi-octane racing fuel is available.....if you search hard enough. IIRC, it runs about 105-110.

    Long shot:
    Put in a colder plug.
    Don't believe everything that you think.


 

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