i had a similar problem with my 02 250 trailblazer it would idle fine but when i hit the gas it back fired and had nothin but ran good with the choke it took me a while to find the problem but it was the little fliter on the drian line off the carb so i ran single lines ran great after that

 

It was like that when I got it. I traded a '96 Magnum 425 for the Scrambler and a 2000 Trailblazer 250. The Trailblazer wouldn't start. I cleaned the flywheel and stator and it fired right up.

 

wow man, sounds like you got a great deal. even if the bikes didnt run right. but with a little patience and diagnostics, you fixed it and turned it into a STEAL! way to go man!

X

 

Now I just need a chance to ride it. I rode it up and down the alley behind my house when I got it running. It was a sheet of ice and it was still pulling the front wheels off the ground.

 

holy **** sounds like its got some ***** whats done to it