It's interesting to see the Pe Reivers calculator.

I think it will be fun to see how fast this little guy can pull a plane!

The front bearing has a 'slide in' fit to the case, so I need to get some Loctite and take care of that yet. The 6 inch prop is making plenty of thrust to power a 1/2A pylon racer pretty well. I would probably launch it at 21,000 or so on the first try. I figure the factory sets the timing low to turn those 7x4 props well. I then use the lip of the liner as a guide for cutting the outside diameter of the shim. You can trace a circle on thin brass sheet with a sharp scribe until the scribe cuts all the way through. I also took a wild guess and shimmed the liner with a home made shim. Oh ya, I almost forgot, I made a C/L venturi for it and am using a OS.10 needle to control a bladder tank. I have a MAS 6x4 on it, unbalanced of course. The rod looks pretty 'chintzee', but we'll see how it goes. The piston felt heavy to me, so I removed some material from inside and that seemed to make some difference. The liner looks good, the fit with the piston gets progressively tighter at the top. I took some 600 grit to that part of the shaft and kept working it until it became a light press fit. It turns out that the snout of the crank was jammed into the front bearing too tightly. I tore it apart and noticed that the shaft had a slight amount of drag and a rough feel when it was turned.

I thought this would be a great project, so of course here we are now. and asked me if I wanted to have a crack at a NIB. A friend to us here at the forum had read some recent rumblings in another thread about this engine.whether or not it was worth hot rodding, etc. Well you never know what a new day will bring.

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