Vintage BMW Motorcycle Owners

Hi everyone!

Anyone know if you installing a pre 75 cylinder with 16mm pushrod tubes, on an existing18mm pushrod tube setup, would work?

Are the pushrods compatible? Would I need to swap the pushrods for another part if I install the 16mm cylinder on?

The current cylinder completely failed a leak down test so I was looking at using a spare set of cylinders I have on the shelf. Didn’t realise they were pre 75 parts.

Thanks all!

Mid 1976 model year, the cylinder Jug spigots were increased in size from 97mm to 99mm. The newer 1000cc /7 models came out for the 1977 model year. I am unsure exactly when, the pushrod tubes were enlarged.
Thus, you MAY also have a spigot size difference to deal with....