Post by fz750horse on Aug 6, 2012 12:45:01 GMT
This is very obscure but it might help someone in future...
After I rebuilt my fork post-Brands crash it became obvious that I had also twisted the yokes.
Because I have a 5EB R6 front end, I had made hybrid yokes with an FZ stem and R6 triple trees. When I first did this, I had advice from FZ guru Steve Spencer that the FZ stem was 0.006" smaller than the R6 one and would need to be hard chromed and milled to the correct size. I took the whole lot to an engineer who did the job but commented that he didn't think there was any difference in the stem diameters.
Anyway, I had a spare R6 yoke waiting for just such an eventuality so I took everything round to my mate's hydraulic press at the weekend, pressed the stem out of the twisted yoke and the R6 stem out of the new one, dropped the FZ stem into the new clamp and... it was a sliding fit.
After a bit of swearing and head scratching I measured the hole in the new triple clamp and it was 0.006" bigger than the old one. Further investigation revealed different numbers stamped in the two triple clamps and subtle differences in the castings - looks like Yamaha must have subbed the yokes out to more than one supplier
By chance, another set of yokes had appeared cheap on eBay last week and I had bought them for spare. They haven't arrived yet but fingers crossed they match the first set. If they do, and if the stem then fits without hard chroming I'll post the casting numbers on here so that there's a record of which ones will work without chroming.
Does this post make me the worlds first R6 yoke geek
After I rebuilt my fork post-Brands crash it became obvious that I had also twisted the yokes.
Because I have a 5EB R6 front end, I had made hybrid yokes with an FZ stem and R6 triple trees. When I first did this, I had advice from FZ guru Steve Spencer that the FZ stem was 0.006" smaller than the R6 one and would need to be hard chromed and milled to the correct size. I took the whole lot to an engineer who did the job but commented that he didn't think there was any difference in the stem diameters.
Anyway, I had a spare R6 yoke waiting for just such an eventuality so I took everything round to my mate's hydraulic press at the weekend, pressed the stem out of the twisted yoke and the R6 stem out of the new one, dropped the FZ stem into the new clamp and... it was a sliding fit.
After a bit of swearing and head scratching I measured the hole in the new triple clamp and it was 0.006" bigger than the old one. Further investigation revealed different numbers stamped in the two triple clamps and subtle differences in the castings - looks like Yamaha must have subbed the yokes out to more than one supplier
By chance, another set of yokes had appeared cheap on eBay last week and I had bought them for spare. They haven't arrived yet but fingers crossed they match the first set. If they do, and if the stem then fits without hard chroming I'll post the casting numbers on here so that there's a record of which ones will work without chroming.
Does this post make me the worlds first R6 yoke geek