Took a first look at Siegfried tonight after his Isle of Man duty. Disappointed by same old black sooty plug. Checked ignition timing - it is spot on. This only now leaves the piston and barrel. ADF do a complete new piston and barrel set for around £150 so I will now order one. Thinking here is that external oil appearing on the cooling fins is not coming from the cylinder base, head gasket or rocker box cover. It can only be coming from the inside so something is not right. After Sunday's rally Siegfried will retire for the winter and will be stripped down to the crankcase. I am hoping to find a piston with signs of burning and oil blow by on the exhaust side. That would prove my suspicions.
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