If someone could point me in the right direction, I would appreciate it. My son was riding his 4 wheeler when all of a sudden going up hill it wouldn't move. Didn't make any crazy noises or anything. It idles fine, moves in reverse but doesn't move forward. Any idea on what we should start looking for?

 

I don't know how your reverse box is set up but it sounds like it is stuck in neutral. If it were the transmission itself I'm not 100% sure but I don't think it would move at all.
The only thing I have with reverse is my Kazuma 250 it has an external reverse box that has a foot pedal to engage it. When you release the pedal it only comes back to neutral unless you press down on it slightly then in on the keeper above it. When I got the quad the PO said it would only go in reverse and that was the entire trouble.

 

I don't know how your reverse box is set up but it sounds like it is stuck in neutral. If it were the transmission itself I'm not 100% sure but I don't think it would move at all.
The only thing I have with reverse is my Kazuma 250 it has an external reverse box that has a foot pedal to engage it. When you release the pedal it only comes back to neutral unless you press down on it slightly then in on the keeper above it. When I got the quad the PO said it would only go in reverse and that was the entire trouble.

 

ohh wait i just realised your carb probably loooks like the one near the bottom of this page http://forums.atvconnection.com/chin...ml#post3164086.

My bad dude in this case the brass screw centered at the top is the idle adjustment. The one slightly lower to the left is the air/fuel screw.

 

oops wrong thread lol