Mr. Obvious here, I guess if your new to sleds you may not realize that these carbed engines need a minute or so to warm up first with a combination of choke and no choke, before you hit the flipper. Otherwise the engine will bog and probably die. If you do indeed know this, then refer to the replys above.
Are you trying to move it when it's warm out? As in above 70 degrees? If so, the fuel mixture is probably so rich the engine can't develop any power. How much do you know about Mikuni carbs? Pull the spark plugs, if they are very black, that's probably your problem.
I had the same situation with a Polaris 440 that I purchased in the summer; when I went to pick it up, it would not even move to get on the trailer. A simple jet needle adjustment leaned the mix enough that at least I could move it around a bit and load it on the trailer. Snowmobiles don't like summer!
A forum community dedicated to snowmobile owners and enthusiasts. Come join the discussion about performance, troubleshooting, trails, maintenance, riding tips, modifications, classifieds, accessories, and more!