Ok cheers for that,

would a solution like that be suitable for the R2J 1988 engines?

Also can someone clarify if you can rebuild an MC18 crank with new bearings and have it pressed apart. Everywhere says no, except the source of bearings comment i wrote in 1st post and an Ebay auction from an ex racer.

And I quote

"honda nsr250 mc18
i have loads of spares from when i used to own them.

people are under the opinion tha you cant split this cranks and that you cant get the bearings,rubbish i rebuilt several cranks for less than £50 all bearings and balancing ect."