DIY jackshaft shift kit

[5-7HEAVEN]

I See...

Okay, I see it now.....

10t/17t = 1.7.....
9t/34t = 3.78:1.....
Engine built-in gearing = 4.1:1.....
1.7 x 3.78 x 4.1 = 26.33:1.....in first gear, similar to 64-tooth rear sprocket.....
2nd gear is 9t/26t = 2.89.....
1.7 x 2.89 x 4.1 = 20.14:1.....in second gear, like a 49-tooth rear sprocket...
6th gear might be 9t/14t = 1.56:1.....
1.7 x 1.56 x 4.1 = 10.87:1 in 6th gear, similar to a 26t rear sprocket.....

If you can keep the chain from jumping off the 9t sprocket, the ratios will work VERY well with your Happy Time engine.

In comparison, an SBP kit with 10t/44t = 4.4.....
First gear is 34t/30t = 1.13.....
First gear ratio = 1.13 x 4.4 x 1.7 x 4.1 = 34.65:1.....like an 85t rear sprocket
Second gear is 26t/30t = .87 x 4.4 x 1.7 x 4.1 = 26.68:1.....like a 65t sprocket
6th gear is 14t/30t = .47:1 = .47 x 4.4 x 1.7 x 4.1 = 14.41...like a 35t sprocket

Interesting...

 

[Florida_Trail_Rider]

I need the Retainer that spaces it out..Mine seems to be missing that..

 

[QQ7]

hey jaguar, all those links are broken now.
I'm interested in making one of these myself. could you update the links?
thanks!

 

[Pablo]

That's from our old site. Many parts here: http://sickbikeparts.com/shift-kit-and-all-drive-products/

And here: http://sickbikeparts.com/bicycle-parts-and-tools/