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Rm 125 Recently Jetted


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I had a theory a couple of months ago that my bike was very highly jetted, as this bike was 2nd hand i had no idea and never got around to checking it. The other weekend I finally pulled it apart to find a 540 main jet instead of a 460. Before with the 540 it fouled racing spark plugs so I put a more heavy duty plug in. I was wondering with the lower jetting could I go back to a race one or will I have a fouling problem again?

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racing spark plug? the type of plug shouldn't change if it fouls or not, but yeah if put the jets back to stock and clean all the gook off the fouled plug you should be able to put it back in. most bikes are jetted rich at the stock settings, you might want to consider going a bit leaner, based on the throttle reponse and spark color of course.

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