I'll post an update on today's 07 experiences.
I bought what I thought was a parts saw for £7 - that's $14 in your money. All I wanted was the exhaust, and this seemed like a decent way of getting one. The bad news (from the CAD perspective) is that the "parts saw" is in far better condition that the one I was trying to fix. Damn, now I have 3 07s.
Anyway, I'm not doing a proper restoration like Brad's - I'm creating a working saw and bolting it up to the Lewis Winch that is sitting on my table. So I want functional, not show grade.
Today I tore into it. Piston and jug are good - 160 PSI, with one score mark on the exhaust side. The carb was stripped, dumped in the (new) ultrasonic cleaner and re-kitted. Nice and shiny now.
Then I pulled the starter off. Hmmm. Why has someone cut out a really thick gasket to go under the recoil cover? I peeled it off and put it to one side. I stripped the recoil down, dumped it in the tank and re-assembled it. New rope, nice and clean, looking good. Then I bolted the recoil cover back on....and realised that the fan was binding on the recoil cover. I removed the fan, and checked alignment. Still binding. I removed the flywheel and fan, swapped them with one from another saw. Still binding. Everything looks fine, flywheel nut is torqued correctly, fan is properly in place. In the end, I packed out the recoil housing with a few washers, and it works fine - but why is the crank about 2 mm over to the left? Any ideas, O wise ones?
Anyway, it runs very well. Idle is a smooth 1800 rpm and the cut off kicks in at 7400 rpm. By disabling the cut off, I tuned it to 11,000 rpm, which is the same as an 070. If these figures are wildly wrong, please tell me!
Now all I have to do is to work out how to attach a large mount Stihl to a Lewis Winch - it appears to be designed for a small mount bar.