I actually had the spring inside the ratchet mechanism break. I started to look for replacement parts and found ereplacementpart.com. If you go to the site you can order the "Strarter housing assembly" or if your mechanically inclined order just "Recoil pully assembly". Other replacment parts websites should have the same exploded views; you will just need to do a little shopping to find the best price.
Ernie
August 2010
I have the same issue...it turns out it is a plastic gear on the pulley system and all the plastic teeth are worn/broken...some ingenious person decided it would be good to have a plastic part rub against metal gears on the actual motor housing. I'm trying to find a replacement part now
Warbirds
July 2009
take the top recoil off spring is broke.
Candy
June 2009
I can answer this question...
Bolens BL150 Rope keeps slipping ,what do i need to fix?