Bearing Replacement Issues - GSXR

Hello All,
Having an issue with my GSXR fork swap. I have a 77 xs650 and purchased the cognito moto stem swap and received 2 sets of 99-3515-5 bearings from all balls racing. I am going to be replacing the front end with a 2003 GSXR 750 front end. I had the gsxr stem pressed out and the new cognito moto one pressed in along with the inner bearing for the bottom. I was told to put back the old xs650 bearing (top part) to use a spacer and then put in the new outer race. However, it is way too small, like 1mm. The bottom of my head tube appears to maybe have worn over the years or something, but half way up there is a ridge. How am I supposed to get this outer bearing race to stay put? The inner diameter measurement of my tube is around 49.05mm...definitely not 48mm.

-Brent

gonna try this...hope it works

Oooooohhh, I'd rethink that. Lot of critical forces in there. At the very least, I'd make up a spacing sleeve for that...

would you use one of these?

Well, I guess I'm spoilt. Having a lathe makes this an easy-to-solve project. I'd turn a precisely fitted spacing ring for this, replicating the installation press-forces.

Outside of that box, I can't think of anything that I'd trust for handling the steering/suspension loads...

Thinking about this some more, seem to recall a similar 'race too small' issue in an older thread, a parts mixup. Just can't find it. This one has some dimensions:

http://www.xs650.com/forum/showthread.php?t=5486

Why don't you measure and order a bearing and race that would fit directly from a bearing house?

Ended up cutting a ruler to spec and bent it around a socket to shape it. The ruler was steel and was 0.5 mm thick which was perfect for what I needed. I was able to tap in my outer race and it is staying put for now. Thanks for all the feedback.