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Engine revs increase with cover on???

Matt Bond

New member
Hi.
this has me baffled. After starting engine for first time this year I notice a big problem. Basically the engine idles fine without cover on top, but when cover is on the revs increase dramatically after only 2-3seconds. Nothing is touching throttle cables etc. why ???
Engine is Yamaha 4, fourstroke. 1998

thanks, Matt.
 
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