What rings do I need, weird 250.
Posted: Sat Nov 11, 2023 3:08 pm
Hey gang- I have a 68 250 Scrambler and a 72 Mototrans 250. I am just digging into Ducati's as restoration projects.
I started with the 1968, which I bought pretty much as you see it. Cylinder and head were off, head was fresh back from what was supposed to be $1500 worth of head work. I started to dig into this bike and have all of the manuals. I was suprised to see the 8 fin cylinder on this bike had a 76mm sleeve and the piston measured 75.68 below the rings. Seems like a 350 sleeve? Once I cleaned up the piston I can see what is either 06 or 90 on the top. I am confused about what i have. it’s def a 76mm sleeve in a 250 8 fin. Since I am new I am not sure what the piston actually is and I have no idea what rings to buy. The oversize stamping on the piston is throwing me and the fact that even though I have 3-4 workshop manuals I have no idea what I am looking at.
I have found a couple of ebay postings with this particular piston style with old 250 barrels.
I have an icloud album below. Has a Japanese 21" rim on front, headlight is wrong, tailight is wrong, fenders are wrong. Are the forks correct?
I do have the original Raedelli front, I am curious if front hubs are correct. Will post the 72 Mototrans seperately.
https://www.icloud.com/sharedalbum/#B16GI9HKKG7P6Ln
I started with the 1968, which I bought pretty much as you see it. Cylinder and head were off, head was fresh back from what was supposed to be $1500 worth of head work. I started to dig into this bike and have all of the manuals. I was suprised to see the 8 fin cylinder on this bike had a 76mm sleeve and the piston measured 75.68 below the rings. Seems like a 350 sleeve? Once I cleaned up the piston I can see what is either 06 or 90 on the top. I am confused about what i have. it’s def a 76mm sleeve in a 250 8 fin. Since I am new I am not sure what the piston actually is and I have no idea what rings to buy. The oversize stamping on the piston is throwing me and the fact that even though I have 3-4 workshop manuals I have no idea what I am looking at.
I have found a couple of ebay postings with this particular piston style with old 250 barrels.
I have an icloud album below. Has a Japanese 21" rim on front, headlight is wrong, tailight is wrong, fenders are wrong. Are the forks correct?
I do have the original Raedelli front, I am curious if front hubs are correct. Will post the 72 Mototrans seperately.
https://www.icloud.com/sharedalbum/#B16GI9HKKG7P6Ln