Could anyone confirm if the crank is the same in all the above models? I have recently bought a spare bottom end for my MC18 track bike with no crank - does the 21/28 one fit? Also does anyone know how I can identify which model the bottom end is from as I beleive all the engine numbers start with MC16 - as these do!! Thank you for any help.

Tony

MC18 crank has a "conventional" looking centre seal - beside the centre main bearing on the lower cylinder side.

The MC21/28 crank has an "O-ring" type centre seal sat in a groove machined into the centre main bearing.

The MC21/28 and MC18 cranks are NOT interchangeable.
_________________
Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

Check us out on Facebook! Please "like" our page!

Many thanks for that Andy - is there no way to identify the bottom end - I was told it was MC18 but the guy wasnt sure. Looking at the centre crankshaft journal, I think it is 18 as there is a space where a seal would fit and no groove for an 'o' ring.

Cheers

Tony