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