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Montesa Mh200 Noisey

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only me again, ontesa done .started 3rd kick, runs ok ,tickover good but engine seems noisy, could it be piston slap? plenty comp, hope not mains, how can i determine cause . any tips? many thanks. carl

piston slap more like tapping on over run or low revs goes when biulding revs up ,mains are growly as if sand in the engine is there all the time and louder with more revs

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