Thanks for the bad news, tezza. (But thanks for the links on spare parts).
Would have though some of the conditions you suggest would have made some "metal" noises when crakshaft is rotated. Still at least the engine seems like will have to be removed from the chasis and start pulling it down. Guess removing the head is the start - see what is happening - if piston is moving up and down. Maybe I should take the head off while still on the chasis as it might be in the head that the problem lies. U think?

To Bruce/Deejay/Grumpy - any guidance from here would be very welcome.


PG
My Mowers:
SB Model 45: 17",3hp, Model No:21339, B&S Model 80202, type 1735-01, Code 82111901
SB Model Diplomat 430: 17", 3hp Model No:1414, B&S Model 80202, type 0880-01, Code 79110101