CB200 Cam Chain Sprocket on Crankshaft Align

franque · 11-20-2017, 09:36 PM

If it is like other Hondas, it is more based on the position of the flywheel, which you've already removed. As long as you're close to TDC, you can just mark a couple of places on the cam timing sprocket (up top bolted to the camshaft) to make sure that the chain goes back on aligned with where it was on the cam, and then mark the chain/crankshaft sprocket as well, that way you know that everything is properly indexed.

Effectively, as long as the valves are loose (i.e. you're properly at TDC), and the piston is pretty much at the top, which you could verify with a screwdriver in the spark plug hole, as long as everything is properly indexed to itself, and none of the valves are engaged, getting the exact tooth correct isn't that important, you just need to make sure that it all goes together the same way it came apart.

You could either use nail polish or a paint marker to mark both, make sure that they are free of oil so that the paint will stick. Additionally, have you considered just replacing the crankshaft? I haven't really tried to source a rod or a crankpin for one of these, but traditional Honda practice is to just replace the crank (also that has less of a margin of error).

11-20-2017, 09:36 PM	#2
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	If it is like other Hondas, it is more based on the position of the flywheel, which you've already removed. As long as you're close to TDC, you can just mark a couple of places on the cam timing sprocket (up top bolted to the camshaft) to make sure that the chain goes back on aligned with where it was on the cam, and then mark the chain/crankshaft sprocket as well, that way you know that everything is properly indexed. Effectively, as long as the valves are loose (i.e. you're properly at TDC), and the piston is pretty much at the top, which you could verify with a screwdriver in the spark plug hole, as long as everything is properly indexed to itself, and none of the valves are engaged, getting the exact tooth correct isn't that important, you just need to make sure that it all goes together the same way it came apart. You could either use nail polish or a paint marker to mark both, make sure that they are free of oil so that the paint will stick. Additionally, have you considered just replacing the crankshaft? I haven't really tried to source a rod or a crankpin for one of these, but traditional Honda practice is to just replace the crank (also that has less of a margin of error).
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