While I have my engine torn down I am checking the
timing sprocket marks with TDC etc. Here's the weird
thing. The alignment marks are off a little, maybe not quite a gear tooth, or maybe just. I find TDC on fire stroke and check that with valves / cam timing
and it seems correct. Both valves closed and preload
set right. Used a dial indicator to exactly find TDC and same with valves so I know the two are where they should be. Whats up? Can the marks be "off" somewhat on the chain set?