3 speed jack shaft

camlifter · #1 (**permalink**) 09-24-2009, 07:18 PM

heres the drive for my 4 stroke build,

diceman2004 · #2 (**permalink**) 09-24-2009, 08:06 PM

pretty cool setup , have you done a 3 speed hub before , i,ll be keeping an eye on this one , curious to see how well the hub can take the abuse . how do you start the motor on this one ? ( your drive side of the 3 speed hub probably still coasts ) . is it gonna have a pull start ?

or is your next post gonna say ( homer simpson ) dohhhhh !!!!

markeatmark · #3 (**permalink**) 09-25-2009, 01:14 AM

that is cool. looks like a lot of fine workmanship

bairdco · #4 (**permalink**) 09-25-2009, 01:28 AM

is that a rollfast/ jc higgens frame with the middle tube removed?

spad4me · #5 (**permalink**) 09-25-2009, 05:37 AM

The double transmission set up is nice.
Dis you use something like this for the engine mounted one.
X7, FS529 New Cat-eye Pocketbike CVT transmission.

camlifter · #6 (**permalink**) 09-25-2009, 07:12 AM

the motor is pull start, the frame is a columbia from the 60's, the gear box is for a pocket bike. i think it should hold up well, the motor puts out much less tq than a person can put to the hub. it's just something i wanted to try, no free wheel crank, and the out put shaft of the gear box is now supported by 2 additional bearings, that should take care of the flexing problem of the hoot type gear box's, this one is a chain drive box.

bandito · #7 (**permalink**) 09-25-2009, 06:30 PM

CAM the chain that drives the wheel, Why didnt you go straight to the shaft with a drive gear? It seems it would be simpler and less moving parts plus less loss of power. What was your thinking on this? Im thinking you did this for strength and to cure the shifting of parts maybe as you said, was this the sole reason?

camlifter · #8 (**permalink**) 09-25-2009, 08:34 PM

Quote:

Originally Posted by bandito

CAM the chain that drives the wheel, Why didnt you go straight to the shaft with a drive gear? It seems it would be simpler and less moving parts plus less loss of power. What was your thinking on this? Im thinking you did this for strength and to cure the shifting of parts maybe as you said, was this the sole reason?

not sure what you mean. if i used gears from the gear box to the 3 speed hub that would reverse the direction. i'm using the 3 speed hub to get more reduction than the 3 to 1 box offers plus getting 3 speeds and no need for a free wheeling crank set. i should have it ready for a test drive in a few days.

Dan · #9 (**permalink**) 09-26-2009, 01:14 PM

FANTISTICO CAM! Looking forward to more pics and updates. Really, very cleaver. I was just going to ask how you were going to address chain stretch but on 3rd view of your pics,.. wow, good job

(I wanted to do some thing like that but with clutches that engage at different RPM and freewheels. Would work like an automatic tranny)

bandito · #10 (**permalink**) 09-26-2009, 06:45 PM

OK cam let me be a little more precise, in pic 1 it clearly shows what Im asking. The shaft coming out of the gear box is only about 4 inches away from the drive chain that drives the wheel. Just curious as to why you didnt go to that shaft directly with the drive chain that drives the wheel. Pic 3 shows this very well also........nice fabrication and clean install.