I recently purchased a 2001 SXR 700. So far I have put in new plugs, premium gas and I have cleaned the carbs. The sled will run great and take off with no problem and plenty of power. My only problem is when i let off the throttle the engine will go down to 3 grand and then cut out. It sounds like it is hitting a rev limit and will do this for about 10 to 15 seconds unless I hit the choke real quick and then it will go down and idle fine. Any ideas on what the problem could be?