The end of this shaft will house a pillowblock bearing mounted on a brace, so as to support the extended shaft and increase in power transfer the shaft will see.
Thoughts, suggestions?
Here's a thought on the support shaft for the tranny. - beware, I'm gonna babble.
The Dez, with it's old engine setup, had the tranny mounted under the Arctic Cat engine - the tranny input shaft was supported with a thick walled short, stout tube that came off the chassis. There was very little clearance at full upshift between the belt and the support shaft (and this bit me in Mexico when we modified the tube once ...)
Anyhow, with this idea in mind for the RX1 transplant (
http://www.yellowdogracing.com/dezrx1install.htm) I kept the support for the input shaft between the clutches for easy and speedy belt changes. (Jay supports his from the back of the chassis - you pull a quick pin to rotate the support out of the way - one extra step I was able to remove from the changing process)
What made this setup work for me - and maybe for you with the 600??? - is that the rear engine mounts on the RX1 are supported by one LONG ass bolt that goes though both engine mounting lugs. The long ass bolt has a rounded head with a square underneath the head - no need for a wrench on this end - just for the nut on the other end. Sweet, easy setup.
Now, the next issue with this long ass bolt is that it's too long - in the RX1 sled, it goes through a couple bosses that are about 2" wide each.
Jay cuts this bolt to length, threads the cut end, sticks a nut on the threads and then welds the nut to the end of the shaft. I recently read an article on bolts and decided there was no way I was gonna modify this bolt. Instead, I was gonna use it for support.
What I did was turn down a piece of steel so that a piece of 1.125 x .095 walled tubing would slide over the tube. Next I welded the thick wall tube to the outer side of the engine mount.
The excess bolt would be in this tube. The tube, along with the bolt (which is under tension when torqued down) would act like a large boss for the input shaft support.
The support slides right over this boss and the bearing in the support slided over the end of the input shaft on the tranny.