ok, my chain tensioner is partialy broke. The spring, roller and roller arm are fine. Their was a samll pin keeping the roller arm from sliding of of the bike frame. That pin appears to be broke. My problem is i dont know how to take it off to see if i can tap the small broken pin out. Any videos or tips on how to fix this. Do i have to take off the rear shock just to get to it.

This is a NST 250cc. Chineese quad.