Small Engines (Lawn Mowers, etc.): snowmobile engine, blink of an eye, arctic cat

Question
  hello, my sled isnt running right. It was running perfect then all of a sudden in the blink of an eye, it started sputtering and popping. it had no power and was very hard to start when i slowed to stop. i finally got it started with gas down the cylinder and limped it back home. once she got revved up it had all of its top end but no power. now it wont even start with gas down the hole.it will fire once or twice but wont run. i took and cleaned the carb, but no difference. i know it has lots of compression and air and fuel and all kinds of spark but still wont start or even run with gas down the hole. i just cant figure it out. please help. it is a 1994 arctic cat jag 440 fan cooled.the sleds out of town so i cant give you more than that.

John


Answer
I don't have a lot of experience with sleds but the first thing I would do is replace the spark plug.  I have my own sled do the similar thing and a new plug curred it.

Try using an NGK brand plug, they seem to run better than Champion and other brands.

Let me know if the plug solves the problem.
Eric