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Thread: OS 21XM OB Tuning
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11-07-2016, 10:28 AM #1New Member
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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
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11-08-2016, 07:33 AM #2
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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