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It's more accurate to use a dead stop device to locate TDC. The crank can travel a number of degrees while the piston is sitting still at TDC.
You can fabricate some flat stock that spans the top of the cylinder and held on by two opposing studs. Drill and tap the material in the middle so a stop bolt threads into it.
1. Position the piston some distance down the cylinder.
2. Adjust the depth of the stop bolt, then lock it in place with a nut.
3. Rotate the engine clockwise carefully until the piston stops against the stop bolt.
4. Mark the pully opposite the crankcase split line.
5. Repeat 3 in the opposite direction.
6. Repeat 4
7. Halfway between your marks is TDC for your engine. Notch the pulley with a file, then apply white paint to ID it.
I noticed Jeg's carries a "TDC Plate and Stop" (#128-40200) for about $12.00. They also carry a TDC Locator that screws into the spark plug opening that does the same thing. Make sure the rocker arms adj. are backed out so they don't interfere with the valves (I haven't tried the latter, so I can't vouch for adequate clearance using this method).
Sherwood
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