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You mentioned you were going to check the valves then noticed the timing off , did you check the valves ??? , if so what did you find , was it within spec ??
Also , if it was out of time and you only put it in time and now its really hard to start , does it turn over completely without binding up (like something is hitting ) ?? , if so , did you check the Decompressor is working correctly ?? , if the decompressor sticks or was installed incorrectly , the compression will be like a old Harley and be next to impossible to kick over properly , on these engines , if you do not kick the engine over with force and speed (a full fast stroke) the engine will unlikely fire , it needs momentum to fire , you can't kick it slowly like a 125 , so if the compression is preventing you from kicking properly , that "might" be the reason why it did not start
What i would do is recheck the valve lash , and remove the spark plug and turn the engine over by hand and watch closely at the valves , make sure they are opening and closing correctly and fully , make sure the lash is correct , and triple check the timing and function of the decompressor , if the bike is in time , and the engine has Spark , Gas , and Air , , and there is no damage from valves hitting piston (from timing being off) it will run
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