Thanks Grumpy. I appreciate the detailed explanation.
I gave the mower a good test on the weekend and didn�t encounter any problems at all. It is starting first pull from cold so the primer system is now working spot on.
Grinding and lapping the valves in this instance seems to have solved the problem.
The mower has now been fully serviced and runs spot on for a mower of this age. This actual engine is really smooth running and relatively very quiet.
I think this thread can be closed.
PS. I have not forgotten about the Suzuki we were working on. I have been following your other thread and have the relevant parts soaking in carb cleaner and ready to be re-assembled tonight!
