Having trouble with my 2002 Yamaha Grizzly ATV. Runs great the first few minutes and then it runs rough or die

my 2002 Yamaha Grizzly ATV. Runs great the first few minutes and then it runs rough or dies. It has done this since it got stuck in a snow drift last winter. It acts like it doesn't get enough fuel. Anything I can check?Having trouble with my 2002 Yamaha Grizzly ATV. Runs great the first few minutes and then it runs rough or die
Is the choke stuck?
Check any fuel filter, choke and your air filter, might be dirty or clogged, also check the spark plug, might be fouled.Having trouble with my 2002 Yamaha Grizzly ATV. Runs great the first few minutes and then it runs rough or die
Could be summer blend of gasoline.
Fuel Filter. Or sounds to me like you still have water in the carb..that can last for over a year or so...that would be my best guessHaving trouble with my 2002 Yamaha Grizzly ATV. Runs great the first few minutes and then it runs rough or die
Check for rust and water in your carburetor.

George
Start with the basics, if you haven't done it yet, change the oil, clean the filter, install a new spark plug.



Then see how it runs, if it's still doing the same thing, then as soon as it starts to run bad, stop and pull the spark plug. Does it smell like fuel? No fuel smell? Make sure the petcock and float bowl needle are clean and allowing fuel though.



If the plug smells like fuel, then put the cap back on the plug and ground it to the engine. Crank it over and check for spark. You should see a decently bright blue spark. If there's no spark, or it's weak, it may be an electrical problem.



Usually a bike that runs okay when it's cold, then runs like crud after it warms up has a bad CDI - but you can't really test them, and it's not cheap to replace, so start simple then work to the electrical problems.



If you've got another Grizzly (a friends bike, etc.), you can try trading out the CDI from his bike and see if the problem goes away. It won't hurt his CDI.