Never rule any suggestion out until you have actually checked it. You came here asking for suggestions .
I presume you mean while trying to ride ?
Is the TORS brain unplugged ? Three wires to little box under hood.
Check reeds, fuel flow to carb, clean carb , check reeds, check flywheel key , install new plug, trim 1/4 inch off plug wire, set float level, make sure you have good spark, run separate ground wire from coil to unpainted surface on engine. Do a compression test with a GOOD gauge , Craftsman being the cheapest you should use.
This list in no particular order and may not be complete.
When you exhaust ALL of these possibilities check back in, we'll go from there.