Re: 10 speed tranny on a cb900, how does it work?

Posted by Half-Caf on Jun 29, 2012; 2:00pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/10-speed-tranny-on-a-cb900-how-does-it-work-tp4023759p4023834.html

Wow, this is stirring up quite a bit of discussion!
Truck, you wanted a pic of my 900, so here it is!


I bought it in fairly rough shape, but I basically just wanted the motor to stuff in my 750 frame.
Now I never did bother tinkering with the 900 before I took it apart, so I can make no grounded claims on riding down the road, but the mechanics I do understand..

Just remember that the 900c has the same exact gears and shifting as your 750 (internal trans)
The Sub-trans basically just bolts onto that and adds 2 more gears on top of it.
The two are not really integrated in any way other than the fact that they are bolted together.

Therefore, the 900c has the regular shift lever that controls the internal gears (comes out of the crankcase)
But, it also has a lever coming out of the sub-trans that lets you select the High-low gears as well -Make sense?

Here is how it looks on the bike:

Engine Trans -> Sub-Trans -> Shaft Drive

So, given the fact that they operate independently, I guess you could use that extra gear option a couple different ways, but once again, I hear that in the real world people use it mostly like an "overdrive" gear.