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BMW K100 rs running poor ?

Brought the bike to work today and after about 6mile engine started spluttering and running rough. Will stay going at higher rev but no power and dull muffled sound. Like it was running on 3 cylinders but could be fuel?. Its 1984 and running poor all the time now. Other than the plugs what should I check? Battery is fine

seamie Irl
July 2011
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Mend Vehicles, Motorcycles
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