TTI 6 Speed Gearbox

acotrel said:

I finally got my bike back together yesterday after fitting the replacement selector drum to get the gear change in the right direction. I'd been putting the job off for the last 8 months, mainly due to hot weather, but partly because I was cheesed off about having to do the job, and not knowing what was inside the box. After I checking had removed all the screws from the cases, I couldn't get them apart easily, I hit the two outer cases with a rubber mallet, however only very the outer one came off. So I rang Bruce Verdon and he told me it should just come apart. So I then gave the end of the mainshaft a good bash, and ended up with the cassette in my hands. I could see where selector drum the detent spring and ball were located so I tried to re move the cover screw. I had to use multigrips on the head of it - strongest loctite ever, - And then I found the spring and ball don't come out that way, they are inserted from inside the bore where the drum fits. When I tried to unscrew the two shafts which held the selector forks, they simply slid out and dropped the forks. I'd looked at the cassette and thought I'd seen four selector forks, however there were only three on the clean rag I'd spread on the bench. So I looked on the floor etc. I changed the selector drum to the inverted pattern one (held the ball and detent spring up) , and put the bits back together again. I then fitted the cassette back into the inner case and fitted the outer. The whole thing now works perfectly, however I still went to the TTI website, and looked at the photo of the 6 speeder and counted the selector forks. I am eternally grateful that the gears are held onto the shafts by circlips, and that I didn't do the job during hot weather. I've never been so much all fingers and thumbs in my whole life.
I once watched my mate fit the desmodromics to a 4 valve Ducati head, I'm glad it is not my job to do that. You need fifteen fingers and three thumbs.

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