Hi Grumpy. I didn't have a chance to take any extra pictures but I will admit to an embarrassing moment. I had a good look at the carb (with aircleaner etc still attached) and the spring loaded screw in the middle of the float bowl had been touched. By me. I thought it was a fuel contaminant drain of some sort. Ahh the shame!!
I turned it out about one and a half turns and it idled smoothly from a cold start. It still did blow puffs while running but during a fairly smooth idle. Did a few laps of the yard and it seemed fine except for the very fine tinge of smoke.
I'm hoping it might sort itself with the fresh oil. I'm guessing the bloke who owned it wouldn't have been a stickler for the correct weight oil.
It does blow smoke with any advancement of the throttle position. Predominantly black but with some blue.
