Doug,
One other question.
Are you using 2mm nylon because if you are using a thicker one than is recommended this also could cause you problems.
The pawls on the flywheel should be at 90 degrees. They could be bent.
If you go to this site you will be able to download a parts list for your machine as this could help as well to find your problem.
http://www.ryobioutdoor.com/main/manuals/index.html

Regards,
Bruce

Regards,
[Linked Image]

Bruce


Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.