Is it possible

E

Evolutioneddy

New Member
Why not instead of getting a jackshaft to use the shifting gears flip the motor around and not even worry about a jackshaft wouldn't the sprocket be going in the right direction and then you can maybe use a 3speed or better internal hub shifter would that work
 
Sorry, Eddy, it won't.

Stare at your engine's clutch, while you spin it any direction.

Now reach over and spin the clutch oin that same direction, as you sit on the other side of the engine.

See what I mean?
 
Thank you for the info I guess I'll have to start my plans for a home made jackshaft I have a cruiser at the moment and was just looking for a cheap way to accomplish some rpm reduction at speed my motor stock as it is actually has more than enough power maybe I just need to look into a reduction in my drive sprocket size although I wonder if there was a way that you could mount a 3 speed or 5 speed hub backwards and adjust it to grip the opposite direction I guess not knowing exactly how things work give me crazy ideas but sometimes that's how the best ideas come to be
 
Lol, mb builders have been thinking about reversing multi speed hubs since day one.

Unfortunately the hubs freewheel helplessly when reversed.

However, at least one builder is working to reverse the hubs, costing special machine work and $$.

To date, no one has been successful.

The cheapest gear reduction is a simple rear wheel sprocket.
 
One way I can think of doing what you talking about is you'd have to have an input gear and an output gear on the internal geared hub then you'd have to attach a gear to a sprocket. You'd need a set of the gear/sprockets. So from the motor the chain would connect to the sprocket side of the 1st sprocket/gear and the gear side would drive the input gear on the internal geared hub. The internal geared hub's output gear would then drive the gear side of the 2nd gear/sprocket and the sprocket side would drive the chain going to the left side rear wheel sprocket.

The only other way I can think of is to use a 2 twisted chains like what's on recumbent bicycles and tricycles. That'd be an input twisted chain and an output twisted chain.
 
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Actually Cannoball2 has adapted Sturmey-Archer's 'fixie' geared 3 speed hub to use with the output of the CG engine. I'm surprized a few of you old timers here didn't read his conversion and test ride of this hub.

It's an expensive gear hub, nearly $150 bucks new. But tough enough to handle your engine's power from a stock 66 cc engine. And it gives you three forward speeds from the engine side, and allows you to pedal start your engine as the hub is 'fixed' gears and doesn't freewheel.
 
Sorry I missed it.

I guess it's an expensive or labor-intensive one-off project.
If not, the fixie-geared 3-speed hub would be commonly used here.

To some, $150 is a cheap price to pay for multi-speeds.
Compare it to the $200 it costs to set up a shift kit.

I wonder if it'd handle 212 engines.
 
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Thanks, here's the hub.

www.ebay.com

STURMEY ARCHER HKS3X.BWWB.E00.BX S3X FIXED GEAR 36H 130MM BLACK HUB 3SP | eBay

Find many great new & used options and get the best deals for STURMEY ARCHER HKS3X.BWWB.E00.BX S3X FIXED GEAR 36H 130MM BLACK HUB 3SP at the best online prices at eBay! Free shipping for many products!
www.ebay.com

unnamed (2).jpg
 
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5-7HEAVEN said:
Sorry I missed it.

I guess it's an expensive or labor-intensive one-off project.
If not, the fixie-geared 3-speed hub would be commonly used here.

To some, $150 is a cheap price to pay for multi-speeds.
Compare it to the $200 it costs to set up a shift kit.

I wonder if it'd handle 212 engines.
Click to expand...
If you're like me and able to TIG weld this looks like a an easy project to make and a better use of the left side of the bike for the drive side. I think CB2 used one of those twin allen screw, tubular metal clamp thingies you can get at McMasters. The main thing is it isolates the engine from the pedal side and raises the drive chain so it doesn't need an tensioner. Should be done only on a bike with long horizontal dropouts so old school early to late 1980's entry level mountain bikes, like old Specialised's HardRock Sports or Nishiki Pueblos.
 
LR Jerry said:
Thanks, here's the hub.

www.ebay.com

STURMEY ARCHER HKS3X.BWWB.E00.BX S3X FIXED GEAR 36H 130MM BLACK HUB 3SP | eBay

Find many great new & used options and get the best deals for STURMEY ARCHER HKS3X.BWWB.E00.BX S3X FIXED GEAR 36H 130MM BLACK HUB 3SP at the best online prices at eBay! Free shipping for many products!
www.ebay.com

View attachment 105622
Click to expand...
yeah you want the aluminum shell version as CB2 drilled it to fit up (bolt..) {Edited to correct the sprocket maker...} Sturmey Archer 8 speed IHG sprockets onto the outside of the drive side spoke flange. Basically setting up a hubgear jackshaft. It's pretty brlliant work CB2 is a really creative guy and he shares his work. I'm using a Yamaha PW50 clone carb on my 48cc CG engine after reading his experiences with these clone carbs. It's a brilliant carb for the small engines.
 
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