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  1. #1
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    OS 21XM OB Tuning

    Hi Guys
    I normally run monos here in the uk.
    I have resurected a Bandit Boats 30 hull I have with a OS 21 OB
    It has a Jim Erwin pipe on, instead of the stock muffler.
    I am told that the engine ports would need to be retimed in order to use the pipe efficiently. Other wise stick with the stock muffler.
    Has any one opend up the exhaust port timing on this engine? If so by how much?
    cheers for any comments.
    Tony
    Cambridge UK

  2. #2
    Join Date
    May 2008
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    S.Tpa
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    I have not tried a different pipe on mine, but frankly they run very well in stock form and very few mods.
    Great motor.
    I have gone to find myself , If I return before I get back - Keep me here

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