Just rebuilt bottom and top end cant fiqure out how to set timing

The ignition timing is CDI ignition, pre-set at the factory. You can't change it. The valve timing is the only timing you can do and that is done by lining up the static cam timing mark and the timing mark on the flywheel.

If you simply installed the cam chain on the gear without paying attention to the position of the crank and the position of the cam then the valves are likely not opening and closing at the correct time. Too far off and the piston can hit the valves and bend them and possibly crack the valve guides.
Check a service manual. Cam chain timing procedures will be shown in the manual.

Please rate this answer. Thanks Tasha!