I've recently purchased a sidewinder rc nitro buggy. Have done the break-in stuff, and all has been fine. Took it out yesterday and was using it, turned the car off for a bit, and then when i went to turn it on again, the pull cord came out and stayed out. After checking it and changing it with other ones, the problem that i have is this ( and this has happened with every pull start i have tried).........

it won't retract once i put it on the car, it will work fine and retract when it's OFF the car, but as soon as i put it on the car, it won't retract anymore. Does anyone have any ideas as to why this is??

Ihave checked the cord and everything, and it's not snapped, it just won't retract once i get it onto the car, and it's driving me nuts!! lol