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I have a 02 440 pro X The sled has no top end......runs out of motor, I checked my main jets and have them set @ 300 clutch seems to be working fine, is it possible for the timing to be out???? Any idease would be great, I would like to take a trip to owen sound this week end but I am grounded in the garage till I get this figured out.
 

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Make sure your exhaust valves are clean and functioning properly. Have you looked at them recently? Using high quality oil helps keep them from getting a sticky carbon coating all over them. However, you'll still have to clean/inspect them occasionally. If they are gummed up, clean them without gouging or harsh abrasives. I believe the recommendation is a 3M scour pad or such.
 

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Yeah, define what you mean by "no topend". Its only a little 440, if it will pull 90-100 mph you are doing pretty good.
 
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