Well I came across an issue which didn't seem right. Replacing the fork seals on the '79 CB750Kz I got OEM seals 48mm x 35mm x 11mm and drove them home. I had to get new seal clips and dust seals as the old ones were done. When I installed the seal clips over the new seals I noticed that there was space between the seal and the clip, meaning that the seal could shift up 2.54mm before the clip would stop any further movement. Having recently cafed a CB450 I was used to there being a seal spacer that sat between the top of the seal and seal clip. But according to the OEM fiche there isn't a spacer in the '79. I searched to see if there were other bikes that had a spacer that could fit, and found that Yamaha's XS650 uses the same seal as the '79CB750 but uses a spacer between the seal and retaining clip. But with my luck the spacers were out of stock a MikesXs.net. So I decided to make my own, I took a short piece of ABS 1 1/2" drain pipe and using my lathe I spun two spacers 2.54mm thick each. The OD of the drain pipe is a perfect fit in the fork tube and the wall thickness is enough to cover the outer seal and yet not enough to interfere with the upper seal wiper. I dropped the new spacers in above the seal and then snapped the clips in place above them. No way will the seals move now, so no potential leakage from shifting seals and the best part is the spacer won't rot or rust. ;D
