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You have the older pushrod motor. These zongshens were used for a while on china bikes.
If you want to adjust your valves this is when you must find TDC for the timing of the VALVES. This is NOT ignition timing.
If you are installing a new camshaft for the valves, then again you MUST find TDC and align the marks on the camshaft with whatever point of reference the manual specifies. On newer 4T MX bikes they use the marks on the cam to be level with the top of the cylinder head for example (SOHC/DOHC system).
If you want to adjust the dirtbikes ignition timing then you do not have to find TDC at all, you need to have a timing light and you need to remove the plug on the case where the top of the flywheel will be. There is an indicator on the flywheel for TDC which is where "0 degrees" is for your timing light.
To change the timing on a bike you need to remove the flywheel cover, and remove the bolts/screws on the stator and adjust the stator position to advance/retard ignition timing.
You have to recheck your position change with the timing light every time as far as I know. For these bikes I would just leave it at 0 degrees
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