Final drive chain tension

Love my Iwis Chain. From new , no need to re-adjust after 5000 kms. running , spray oiled up every 1000 kms . One inch up and down central movement , with no tightness variations , spinning up the rear wheel to check various locations. Changed a tire during that time too. I look for road grit on the chain all the time and consciously avoid rain and bad weather. I'll even turn around to avoid dusty dirty road construction projects to find a nicer / cleaner route. Good for chain and air filter .

Spin the rear wheel and see how easy it spins when loose and how it stops spinning quickly when tight.
When it is loose the only bother is snatch. I guess the best place to be is somewhere in the middle.

Chain tension can be very subjective, it’s tight, it’s loose, it’s OK etc. i considered buying a Ducati one time and they include a spanner to ensure the chain is correct. My 900 Trophy suffered a broken chain link from new, and a friend’s Sprint shed its chain at speed in France wrecking the engine. Both caused because a. a batch of bad chains, and b. the suspension goes over centre and tightens over bumps. So for the Commando with its old style chain I get someone to sit on it while I check the tension as it’s rolled forwards. I can’t sit and lean myself any more, my joints aren’t flexible these days.