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4 Stroke Bicycle Engines & Kits 4 stroke engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine


3 speed jack shaft

4 stroke engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine


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  #1  
Old 09-24-2009, 06:18 PM
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Default 3 speed jack shaft

heres the drive for my 4 stroke build,
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Old 09-24-2009, 07:06 PM
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Default Re: 3 speed jack shaft

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 !!!!
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Old 09-25-2009, 12:14 AM
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Default Re: 3 speed jack shaft

that is cool. looks like a lot of fine workmanship
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Old 09-25-2009, 12:28 AM
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Default Re: 3 speed jack shaft

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

Last edited by bairdco; 09-25-2009 at 12:29 AM. Reason: can't spell
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Old 09-25-2009, 04:37 AM
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Default Re: 3 speed jack shaft

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.
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Old 09-25-2009, 06:12 AM
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Default Re: 3 speed jack shaft

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.
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Old 09-25-2009, 05:30 PM
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Default Re: 3 speed jack shaft

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?
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Old 09-25-2009, 07:34 PM
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Default Re: 3 speed jack shaft

Quote:
Originally Posted by bandito View Post
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.
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Old 09-26-2009, 12:14 PM
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Default Re: 3 speed jack shaft

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)
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Old 09-26-2009, 05:45 PM
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Default Re: 3 speed jack shaft

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.
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