I have this 2006 arctic cat 250 utility. when I put it in forward high it makes a clunk sound every few seconds. everything works fine in forward low and reverse. does anyone have any idea what the problem would be? I was thinking maybe a gear with a tooth missing? thanks.

 

its the tranny a gear maybe a little ground or just out of place i had the same problem it click in foward and diddnt in revierse