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bogging/stumble went away WTF???

So 700 and 600 09 rmk's are bogging at 7500 rpm or so....drop 1000 rpm....thought i had it fixed with belt deflection as adjusted, ran great....but next day , colder and did it again....took it to dealer , temps warmed up and it would not do it for them....took it home...+2 celsius this wknd, snow dropped a fair bit and it would not do it....odd time a little stumble..
I am thinking that the prob might be the exhaust valves hanging up...my 600 has a solenoid prob (8 flashes of check engine) and when it stumbled in the warm weather the check eng would flash...could it be the solenoid in cold temps cannot do the job and you move up to 7500 ish slowly or quick jab of throttle and the sled then takes a crap....
My snow is going and so is my warranty....feedback appreciated!!!!
 
I would suggest plugging the exhaust valve hoses and try it. If it works good, looks like your solenoid is shot. At least you can rule that out then. There is a good thread on it here somewhere, try a search you'll find it pretty easy.
Good luck!!
 
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