Cylinder sleeves - KTM engine

[rob w]

Someone told me you do not press the cylinder sleeve out of a '73 - '79 KTM for removal. That they have to be machined out.

Is this true ?

Thanks,
Bob

[ALB]

That is not true. I am not a machinist, but when I sent 250 and 400 cylinders to be resleeved to Forest Stahl, he heated them up and pressed the old sleeves out. When I received the resleeved cylinders, the old sleeves were returned with them. I still have a couple of used sleeves on my work shelf.
The 175 (6 fin) cylinders are the ones that have to be machined out. These were throw away cylinders and I had replacement sleeves made up to fit them. The opening must be carefully machined to fit the diameter of the new sleeve which is then press fit into the opening.

Alan Buehner

[rob w]

I sorta thunk so. Thank you Alan for your knowledge, and clearing that up for me.
Bob