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Had my 98 800 out today for the first real rip. Sled would pull real well from 0 to 90 but it seemed like it would run out of power and would only crawl up over 100mph. Its completely stock and I think it's either not shifting or it jetted to rich or both. Temp today was 32-33f or 0-1 c. ANy ideas?
 

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First thing I'd check is if the belt is worn.  I burnt a belt this year & the sled turned into a slow piece of junk, well it still buried the needle, but didn't have the normal snap to it.  The temps you were running in are warm, but I've run in those temps without any noticeable dif in performance.
 

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Well, considering the speedometers are off anywhere from 8-10MPH, you were REALLY only going 80MPH


Time for a ski-doo.  
   

Seriously, check your tune, compression. Your clutches may be shifting out way too early causing to high gearing too soon for the engine to get into its powerband.
 

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You didn't mention much about your " top - end " speed problem except clutching, but here's a couple things to try...  Using a felt tip magic marker, draw verticle lines on your primary and secondary clutch sheaves, take the sled out and run it as hard as possible, then check the marker lines to see if the belt has erased the marks all the way to the top of the primary sheave, and to the bottom of the secondary sheave. If the marks aren't gone, it's clutching.....  
If this shows o.k. - remove your main jets....  they probably gummed up during summer storage.
 Next thing to do..........  SEND SNOW TO WISCONSIN ! !  ( ZERTMAN8 - JANESVILLE, WI )
 

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First check the obvious.  Check the track tention and all the idler wheel bearings.  

Then check your drive belt.  Compare it to a new one.  Then if that fails check the carbs.
 
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