Skylarking
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The engine timing, that is the crank to cam relative positioning, must line at the beginning of the 4 stroke cycle. This must occur regardless of there being one cam chain (or cam belt) or multiple chains, belts of gears... the relative positioning must be preserved otherwise the engine won’t work...Is there any way to know for sure that it’s in time ? Everything lined up, after I turned it a few times they don’t line up anymore but I have been told that’s normal
About the only way to get the crank/cam rotation wrong (# crank turns = 1 cam turn) is to put in the wrong idle cogs (or whatever they are called) with the wrong number of teeth in the wrong position but I’d expect manufacturers would ensure such is not really possible...
So, with the correct parts installed in the correct places, after two full turns of the crank, the cam to crank relationship will be back to where it was before, presumably with the crank & cam in their correct alignment with all the marks where they should be.
It’s not like supercharging where undersized pullies can have a use... crank & cam gear must be 100% factory spec’d, timing wise, else things won’t work.
Just curious who told you it’s normal for timing, where all marks are aligned*, will not be aligned after two full turns of the crank?
*or if out by 5 teeth at the beginning will still be out by 5 teeth after 2 full crank rotations.