@747:
hi, I made my plug out of 6061
bearings are from allballsracing just picked it off the list from their fork conversion sections. The 7000 and 2000 series its not "hard to weld" persay.. I didnt think it was anymore difficult at least not on the tig. The problem is that even if your welds are fantastic the grade alone is prone to cracking. The biggest loads on a steering stems are in shear, not tensile so I think with the added pins it should resolve the issues.
@Cali:
Hi, the pins were there less for the spinning. I was concerned that when the top nut is tightened it would pull hard on the stem and cause it to crack. The pins were there to relief the stress of the pulling.
It wasn't too much effort to extend the stem, probably about .. oh I say 4hours of actual work. Def much much less that lathing a new stem from scratch. I have gone through and remade a few parts form scratch instead of modifying existing though. The steel in these CB's isnt exactly fantastic haha.
I had to weld some cast iron stuff for my cousin so I havent had many updates but I will post the fork conversion as soon as its complete. I was missing 3 stem nuts off the gsxr which I found on ebay. Once that arrives I'm hoping it'll all just bolt up.
Thanks for your interest, here are the updates on this project that I havent included on the thread:
The swing arm seemed so short on the 74 , for the mono shock setup I wanted to do, I decided to swap in a later model .. i think its a 79
Swap was pretty easy I just had to mill the long end to fit the frame and lathe off the inner race:
On to the mono shock
I noticed not many people post up how to make the top link ... its kinda important. After checking out a few bikes I went with this. Its DOM milled with a 3deg angle to fit into the CB750 frame
I'm using a donor shock from a 96 CBR1000. Which I know has a linkage. Now I can't replicate the linkage with the stock swing arm but talking with one of the RnD guys at honda he suggested as long as I keep the correct ratio it should work fine. To get this ratio down I made a mock strut:
Match the eye-to-eye
Match the travel length
Add a couple of 10mm lines and tada we have mock strut
Figure this will take the guess work from when I get to welding the upper swing arm support