building shift gearing

[5-7HEAVEN]

Thanks 5-7HEAVEN, Your math seems excellent. I have a 10-40 tooth chainring from jackshaft and a 36? (will count it) front chainring on bike. I think the front de railer would keep the chain in place. I'll try to find one today.

Have a 33 tooth sprocket coming for the jack shaft to replace the 43. My splines I cut aren't the straightest so the 33 will mount to a smaller gear right to the 5/8" keyed shaft and bring the ratio perfect. Should get that Wed or Thurs.

It's an excellent combination to start with. You should have it all, brutal acceleration, overdrive, less engine wear and excellent gas mileage.

If you have a powerful engine, it will scream.

If you have a low-to-medium hp engine, it will sing like a sewing machine.

 

[old motorbike]

Low to medium hp . Shifting as of yesterday. Rode it around for awhile
Finally no chain jumping. Installed the SBP 36 tooth and plate to help keep the chain on.
Forgot camera, pics later.
Sure is fun to shift even with auto clutch.

 

[old motorbike]

A few pics. Went 30 mph in 3d out of 6 gears. Sure is fun to shift. Riding in the dark. Can see now.

 

[silverbear]

Boy, that sure worked out nice! Looks neat, too...
SB

 

[old motorbike]

Thanks silverbear, sure is fun to ride with all the gears. Gotta make a movie.

 

[Dan]

Purty work OMB! Looking forward to your vid

 

[Goat Herder]

Very Kewl Old Motorbike I do really enjoy following these D.Y.I. type builds. That bike came out great

 

[old motorbike]

Thanks G.H. Wish I could do more.

 

[old motorbike]

Thanks Dan, Love your avatar. Got one of those go pro cams, want to use without case to be able to hear sound if possible.

 

[Dan]

One of these? that is slick!

go pro cam - Google Search

 

[old motorbike]

That's it Dan,
Here's my 1st attempt quicky around the warehouses. The sound got loused up, but another is coming.
HomemadeShiftkit1stvideo.mp4 video by oldmotorbike - Photobucket

 

[old motorbike]

Tried same camera mounted in box, but sound still crackled from wind noise.

So covered it with louder music. Took it on local streets. Had to leave it in 5th as 6th would slip. (Need to shorten chain more).

Averaged 35.1 top speed, which is plenty with lower rpms. Cars still go 45-50 around town here.

Will do another with a regular camcorder.

MovieHitthestreet1sttime.mp4 video by oldmotorbike - Photobucket

 

[meerkatt]

sweet! but get some gloves on man! only takes a little crash to lose a lot of skin & working with no skin is no fun!

 

[Goat Herder]

I like the way your gearing came out. That bike looks sweet!

 

[old motorbike]

sweet! but get some gloves on man! only takes a little crash to lose a lot of skin & working with no skin is no fun!

You're right I usually have em on but left off to push buttons on cam.
They're no good on workbench.

 

[old motorbike]

I like the way your gearing came out. That bike looks sweet!

Thanks Goat Herder. it 's no faster, but engine runs easier and FUN.

 

[bobby]

great did you fix your clutch problem?

 

[old motorbike]

great did you fix your clutch problem?

so far the clutch is working great for doing this just stock