CT90 High/Low ratio rear sprockets illustration?

bill Badger

bill Badger

New Member
i have a later version CT90 with the high /low ratio gearbox. I have now acquired a double sprocket assembly from the early model which I want to fit to my bike which will then lower the gearing again. No real reason, other than it sounds like a good idea. The hub assembly that I have is in pieces. Does anyone have an exploded drawing to allow me to check that I have all parts?

Thanks in advance....
 
bill Badger

bill Badger

New Member
Thanks for the reply. The diagrams help but neither of them show the flange &(9) as I have it. Mine has the inner studs for the smaller sprocket (1), and also four mounting points for the large sprocket for when it's not in use. When in use, the larger sprocket sits over the smaller one and four bolts lock them together. The drawings don't show this and yet I can't see any way of the larger sprocket being out of the way when not in use.
 
B

b52bombardier1

Well-Known Member
That jumbo sized rear wheel sprocket is for a very early CT90 and its a pain to deal with. And it won't do you any good unless it comes with the short length of drive chain for use with the bigger sprocket. You add and remove this short piece of chain as needed when you are switching sprockets. I can't find that short length of chain listed on Partzilla but you could make it. That whole approach to hill climbing by Honda is a lotta' trouble if you ask me but here is a better look at Part #2 with assorted different tooth counts:

https://www.partzilla.com/catalog/honda/motorcycle/models-with-no-year/ct90-a/rear-wheel

In first gear low range on the CT90 bikes with the sub transmission, I have PLENTY of available torque to climb a muddy thirty degree incline. You will run out of rear wheel traction way before you run out of torque using the sub transmission in low range first gear. I've climbed some very steep hills out in California at 2 mph and 6000 RPM in low range and the only trouble I have had with the sub tranny is that switching between hi and low range often requires the back wheel to be spinning a little to get it to switch ranges. Without that spinning, you will often think you switched but really, its a different form of neutral.

Rick
 
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