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  #1  
Old 08-04-2015, 05:17 AM
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Default 250Sx Jetting

What should i run for desert racing?
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Old 08-05-2019, 08:09 PM
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Just make sure your main jet is not too lean. You can know for sure by looking at the underside of the piston crown. If it is black then the jet is too small and the engine is running too hot.
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Old 10-01-2019, 12:08 AM
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too lean also causes carbon on the top of the piston. Close to the transfer ports there should be some clean areas on the top of the piston from the fresh air/gas charge keeping it cool there.
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