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  1. K&N Air filter / Coughing

    Engine / Airbox / Exhaust / Fuel Delivery
    Hi, I have recently serviced my 97/98 bird and its now developed a bit of a flat spot or cough at about 6000rpm. I have changed the oil, oilfilter, airfilter (from standard to K&N), all spark plugs. The bike runs fine, starts fine and has a bit more kick at the top end, but I cant figure out the...
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