A big thank you to Norm for all his help in getting this to run the way it runs. The mower in question I've had for a few months and in that time I've only got it to run once and that was by putting a few drops of petrol straight into the spark plug hole. So, I do what I've done many times before in this situation. I take off the muffler and inspect the piston and bore, both look ok but I do notice that the rings are stuck. The compression reads 68 psi, this is more than other powertorques I've had which would start first time. I was all set to change the rings assuming that that would increase the compression enabling the mower to run. Norm thought it was a carby issue and went ahead modifying the cam and adding washers in order to make the throttle more functional. The mower then starts and runs. On these mowers it seems it's vital that the correct proportion of petrol and air is delivered to the combustion chamber. I cannot argue about the way it runs, it runs very well and the throttle is more functional. I have tried it again tonight just to see if it wasn't smoke and mirrors and it starts first time. For the recording have not changed the ring sap and the compression measures 63 psi, that's 5 psi less than before the Normtreatment but that seems inconsequential as I can see with my own eyes. I thought I knew a lot about powertorques but I certainly got a lesson today. Norm takes great pride with his machines and I am very appreciative that he shared his time and knowledge today.
