I'd give it a chance to clean out any build up of old 2stroke in engine / exhaust before looking for a problem. Then wet side crank seal. Burning engine / gear oil looks and smells differently from 2stroke.
I'm sure that's true of many plastics, my experience is with Acerbis tanks and guards. Identical stickers will last till they wear away on guards, but lift rapidly on tanks.
Cable routing important, fewer bends (and cable tries) the better.
Rod that passes through gearbox checked to be straight ?
Longer clutch arm. Mechanism not worn and well lubed.
Choice of oil in clutch will affect feel.
https://www.ebay.co.uk/itm/Garage-Door-Bolt-Locks-Heavy-Duty-Pair-Garage-Security-Keyed-Alike/253089041195?ssPageName=STRK%3AMEBIDX%3AITand_trksid=p2057872.m2749.l2649
I'm wary of making the garage look like there is something inside worth stealing.