Question about 1989 kawasaki GPX 250 R

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My GPX used to run fine, now it back fires every now and then in little intervals usually at low speeds in bout second gear, no real patterns though! I have replaced the plugs and cleaned the air filter! Any other ideas?? Or maybe u could tell me where the points would be??

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Do a compression test, if one cylinder is low on compression you could have tight valve clearence, a bent valve or a burnt out valve any one of these will cause your motor to back fire now & then at low rev's

Posted on Aug 31, 2010

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