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:doh: NY 1980 YAMAHA EXCITER 440 NEEDS SOME HELP. AT ABOUT 3500 RPM IT STARTS TO LOSES POWER. THE COMPRESSION IS 120LBS IN BOTH CYL. THE CARB IS CLEAN, FUEL IS GOOD, PLUGS ARE NEW, EXHAUST IS CLEAR, CLUTCH WORKS FINE. IF YOU HAVE ANY IDEAS PLEASE LET ME KNOW. IT IS LIKE IT STARTS TO HIT A REVLIMITER OR LOSES SPARK BUT HOLDS RPM. THANKS JEFF
 

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In what way is it losing power ? BOG how is your drive belt ? if the belt is no good '' old '' it will ride down in the secondary and it will BOG as your ready to go ...
 
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