H 9 speed again

[bvaughn85]

can someone give me some input on how the 9 speed actually works. I understand that it speeds up the bottom shaft to allow higher speeds in between 4th and 5th. Just can’t really wrap my head around how it does that. I’m looking at the bottom shaft while the cable is being moved but don’t see any gears moving? I can see the shifting collar move back and forth, but what is it actually doing?

 

[used red MN]

I give an explanation in this previous YT post.
YT post how 9 speed works
As I said in the explanation there I have never seen one of these in person. Never thought about this real hard, but looking at it now I am going the make this big assumption about how it actually shifts. Look at the video linked in that post and pause it at 15 sec. On the upper shaft from the left the 1st gear is the belt pulley drive gear. The next set is the 9 speed step-up set and the 3rd set is the stock ratio “slower” countershaft drive. This time looking at it I see by the amount of space there those gears cannot slide front to back. So both sets must stay constantly meshed. So apparently something on the sleeve on the lower shaft that the shifter can move forward and back has teeth that shift into internal teeth in the ID of the gears to determine which ratio drives the bottom shaft. Similar to how 5th gear works. I hope this is right. I know D Slater can probably correct this if it is not right.

 

[D Slater]

can someone give me some input on how the 9 speed actually works. I understand that it speeds up the bottom shaft to allow higher speeds in between 4th and 5th. Just can’t really wrap my head around how it does that. I’m looking at the bottom shaft while the cable is being moved but don’t see any gears moving? I can see the shifting collar move back and forth, but what is it actually doing?

First off it's best if shafts are able to turn a little when shifting so nothing is forced. Teeth need to line up like gear teeth do in main transmission. Constant mesh gears on lower shaft are not connected to shaft unless a splined coupling is moved to lock one gear to shaft. Splines are wider than gear teeth. Sleeve you see move has two pins connected that pass through holes in the M&W third and fourth speed gear that moves piece with splines on ID and OD that locks constant mesh gears to countershaft, can also go to neutral between shifts. Pins can sometimes fail attachment to splined piece or come loose at sleeve end if you find a problem. Ring on sleeve goes into slots in pins. Real small allen head screws help retain ring. Sleeve has springs and balls that contact groves in sleeve that works like shift detents. If unit is taken apart the ring that holds pins needs removed but would leave rest of sleeve together if working. Due to keys on shaft after constant gears removal care is needed when pressing parts off down to shift sleeve. Why I mentioned better to get all the countershaft and washers at front different than original. Probably won't happen but if finding extra low gear or fast fourth gear transmission some parts a little different.