I'm not sure of the first engine mileage, that it's the engine of my bike.
Unfortunately she does not have the odometer...
I replaced the chain and the tensioner about 10 years ago, then the bike has not been used for a long time, and I started using her again in 2013.
I can estimate from 5000km (3100 miles) to 7500km (4650 miles).
The second one, that it's the one with the worse chain tensioner , has traveled about 12200 miles (exactly 19613 km).
If we consider that this engine has run regularly in Tuscany, near Florence, Siena and Arezzo, not on the highway, but on the narrow streets of hilltop villages, we are in the range indicated by Dave.
I'm now waiting for an answer from verslagen, I have to send him the chain tensioners, but I don't know where!