Good morning Bendee,
Thanks for your reply.
Yesterday I did this and it looked right, but it still ran rough and smoky.
Took cover plate off and compared piston position against another FSM I have that runs well, and saw the pump was a bit 'late' on this one, so advanced it a little on the slotted coupler and it fires on all four now! No smoke , but not exactly 'On' so may need some fine tuning.
At present, it idles too fast. How do I slow it down?
It appears the diaphragm in governor is OK, and adjusting the throttle-stop didn't seem to help.
Do I need to adjust the big screw on the end of the governor?
What I don't understand, is that if I remove the pre-cleaner, and cover most of the air-intake with my hand, it idles down just like it should.
What does that tell you?
Thanks for all your help!...and all the best