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Thread: spark plug threads

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    spark plug threads

    can some one please tell me how many threads a 2000 n/a harley truck has please . is it a common fault for them to blow plugs out the head

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    and they will if you dont tq them down to spec...

    13ftlbs

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    Quote Originally Posted by bgstew6 View Post
    4

    and they will if you dont tq them down to spec...

    13ftlbs
    thank you im trying to tell my dad this was a problem but " his mate " says its rubbish.this bloke has helicoiled the head and said basically the boys who owns them aint got a clue. . do i now have permission to terminate said people

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    only having four threads is an issue and not having that extra meat does/can attribute to a plug launching especially if they are not tq'd down properly.

    Having the 4 thread heads will definitley help in terms of preventing the issue...but I have seen 8 thread heads launch a plug as well due to improper tq'n of the plug...although less likely to happen.

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    so " his mate " knows basically to keep his gob shut regards expensive issues like this .

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