the pull cord snaps back violently and I have been told it could be the timing, how do I set the timing on the mower. Its a Masport Quantum XE45 4 stroke engine

Dod, June 2004

could also be the blade loose causing this problem.

peter, January 2005

The key on the flywheel must have sheered. The magnets on the flywheel are not passing by the magneto at the right time to send the spark to the sparkplug. That is the timimg. To repair, the flywheel must be removed and inspected for damage and a new flywheel key must be installed and the flywheel nut must be torqued down to the proper spec's.

JOHN, September 2004