My Bombardier quest 650 is running perfect when the engine is cold, but after the first 4-5 minutes it starts not to take full rpm's and backfire will start? Does it need carburator adjustments?

 

Check to make sure that your choke is pushed all the way in. There are two notches on the choke. I have had the same problem with the stock carb.

 

Oops you were talking about the quest 650 not the DS sorry. Im not Scatterbrain for nothin[img]i/expressions/face-icon-small-blush.gif[/img]

 

Make sure your gas tank is venting. If the vent hose has become pinched that may be the cause.

 

if your problem is like mine have you tried getting it hot then switch it off and back on then does the bike run ok for a bit if you have carb trouble there is a tiny gauze in the bottom of the carb that some times gets blocked