While you wait for answers, we may have found some information which could help you.
Success
Message
Trying to find lawn mower part- Power Devil PDG4037R?
Throttle issue?
How to recoil the starter spring - Champion R484TR?
How do I trace a Lawn Tractor starting problem?
Tractor won't shift into gear?
Mountfield empress drive belt?
Reassemble Throttle?
No ignition light?
How to remove roller from lawnmower?
Carburettor?
Flymo 400 turbo stopped working?
Lawnmower repair?