I just bought a 2007 grizzly 450 about a month ago. After it had about 150 miles on it started to run horrible, i will hit the gas all the way and it stops accelerating and it sounds like it is reving. When i turn the choke all the way on it runs fine but it stalls when it idles, so i took the air box off to try something and i took it down the street and it ran fine with out the choke. I dont know what the problem is.

 

Sounds like it's warranty time ...

I take it the air filter wasn't clogged with dirt was it? Is there a fuel filter thats gummed up with crud? Still, one month old ... I think I'd just take it back and tell them to fix it.

 

I cleaned the air filter yesterday and changed the spark plug. when i took the spark plug out it was a dark black color. It was still running bad after i did this

 

sounds like either we're not getting all the info, assembly issues, or faulty part..

 

sounds like either we're not getting all the info, assembly issues, or faulty part..