I recently bought a 2007 Pony and am going through it to get it going. The guy I bought it from said it slipped going up hills when he used it last (about a year ago). I started looking at the drive belts and they look OK. The top belt is loose no matter what position I put the gear selector in. I can see the bracket the variable speed pulley is attached to move when I change the selector and the bottom belt seems tight. The top belt is so loose you can easily slip it out of the variable speed pulley and the idler pulley. When I hold the top of the variable speed pulley the center sheave rotates freely. It does not seem like there is much movement of the idler brackets or springs when I move the shift selector from the brake position to 7th "gear". Is there something I should be looking for that is seized up or damaged?