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