Cylinder wear/coating

Hey Dave, thanks for the quick explanation, that helped me a lot already.

I was wondering about the cross hatches as well, never seen it not being at an angle before.

I‘ll talk to the local engine guy to get the cylinder and piston measurements. If I got your explanation right, recreating the correct cross hatches and replacing the piston rings might be an alternative as well, depending on the current piston clearance/wear right? I would like to avoid boring the cylinder too early, to have fun with the bike as long as possible, since I don’t know how long it‘s going to take to get a decent replacement cylinder to Germany. Maybe I‘m a bit paranoid in that case… Do you have the rings in all sizes as well?

The piston looks pretty worn in your pictures . . . It kind of looks like it was run without an air filter sometime in it's past. I'd be surprised if it checks out as still being good. Anyway, measuring it will tell the story and determine how to proceed. I may have a set of std. rings if you decide to go that route.

~ Good Luck, Dave / Enduronut