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Cylinder wear/coating
Hey guys,
yesterday I disassembled the top end of my DT360 to check the cylinder and the piston. The piston luckily seems to be the standard size. However, close to the decompression release hole, the cylinder wall shows some serious wear in my eyes. It looks like a brass/bronze coat being revealed and the surface feels a little more rough than the rest of the cylinder. In the upper region of the cylinder, this brass color seems to shine through the cross grinding (if that's what you call it in englisch). Do you know how these cylinders were coated back in the day? Since I guess I will have to bore it to an oversize, it would be great to know which piston sizes Enduronut or someone else of you got in the shelf for the 74 360.
As always thanks for your advice & bests from Germany!
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?