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I just got done changing the main jet size on my 700 XCSP. I was told to go up a size or two because it was running a little lean since installing an SS Rumble Pack. When I got it apart it had 450's and I switched it out with 470's and now it seems to backfire worse. Was this too big of a jump? What are the factory standard jets for this sled??[?]
 

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most people dont change the jetting when just switching a can. I think the stock jets will still be fine.
 

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Its about the ride and check method... Go back to your old jetting spec, ride the sled and check the plugs! If you have backfires just after you change the jetting, I assume that is too rich!
 
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