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Discussion Starter #1
I bought a 2003 xc sp 500 it runs great but when you go from half to full throttle to only goes to 6500 rpm. I've checked the compression and that is 119 and 120 so that is good I'm not sure what the issue is. The snowmobile starts right up first pull (cold) so I'm not sure what the deal with it is. Help wanted Thank you
 

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Check the compression hot and cold and with the throttle wide open. Idk if you cleaned carburetors but that is a good idea every preseason as well. And yep clean those VES Valves even with using Full Synthetic in that engine as required those gum up regardless. Some people clean them twice a year depending on miles.
 

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Discussion Starter #5
Check the compression hot and cold and with the throttle wide open. Idk if you cleaned carburetors but that is a good idea every preseason as well. And yep clean those VES Valves even with using Full Synthetic in that engine as required those gum up regardless. Some people clean them twice a year depending on miles.
 
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