We had a bit of fun yesterday in the machine shop. Dip has gotten it into his head that a modern swingarm is a must. So with spare gs750ef and new r6 units in hand we made the trek to my brothers shop in Kitchener.
It was a fairly simple process, calculate how much to machine off the new arm (.625 a side) then index the arm to the head on the mill and cut away....it wasn't
that easy because we were rushing and the arm moved 1/2way through the final side. 30 min of frustration trying to get it squared up again and we finished it off.
In the end, through no planning it worked out perfectly. The swingarms both have needle bearings in them, both have the exact same od and id. The r6 unit used a 3/4" wide unit and a 1/2" wide unit, the gs750 used 2 3/4" wide units, 25mm id. Once the final final pass was done on the mill we measured the depth left of the needle bearing "pocket" and sure as shit is was .500" each. All Dip needs to do now is just get that 1 bearing.
To finish the swap off, we cut down the r6 pivot bushing to 8.75" to match the new swingarm width and then machined the r6 bolt that feeds through it to fit the frame. I belive my brother added 2" of threads to it to make it work.
I'm sure Dip will get around to posting up pictures etc when he gets all the fab work on the bike done.
More pics of the shop (it's a hydraulic machine shop so it's a bit "messy"), sadly I forgot to snap a pic of the hone 18' long stroke!: