I have had a siezure with my MC21, after pulling the heads off the engine I found a small spring sticking out of the centre lube hole that sits over the centre bearing on the middle main crank bearing. it looks like it has come adrift and worked its way up through one of the holes in the bearing housing and up into the crank case. Has anyone ever heard of this happening before. I think that Im the unluckiest bloke going if this is the case.
I can upload some pics but I cant see the button.

You have to use a 3rd party hosting site like photobucket to post photos up.

Worst case pm me and I can host on your behalf if you don't have an account.