Chain and sprocket modification

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yodabob

New Member
Jun 29, 2008
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North Wales PA
Finally got a chance to modify the sprockets and chain to a good quality #40 chain. It’s a tight fit but it can be done. Tight tolerances on the engine 10T sprocket and the rear I machined a clamshell hub and keep the nine hole pattern on rear sprocket of 45T. I’m into power not speed. The idler is a clamshell aluminum mount. Idler is uhmw with a one-inch roller bearing cam follower. The bear is being changed to a track roller bearing when it arrives. Will take better side-to-side pressure and it good to 1400 rpm. See attached pics.
It is like a whole new machine now. Vibrations are next to nothing now, no chain to sprocket noise. Just the chit chit bang bang of the exhaust now.
Yodabob legal in PA
YouTube - motorized bike street legal in PA
 

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Creative Engineering

Creative Engineering

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Sep 20, 2008
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Clearwater, FL
web.tampabay.rr.com
Very Good!!! Yodabob

The engine sprockets are scrap from the Chinese...I had planned on making several hundred of these, but if you are set to do it in volume...

I made the same type of chain tensioner for the Schwinn Jaguar...It worked perfect!

It is not necessary to utilize the 9 bolts when doing a clamshell. Next time try using (3) 3/8" bolts. It will be plenty strong and save on the machining time. I did a 9 pin for the Spoiler belt drive set-up out of necessity.

Jim

Manic Mechanic
 
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Creative Engineering

Creative Engineering

New Member
Sep 20, 2008
1,668
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0
Clearwater, FL
web.tampabay.rr.com
Bob,

I watched the you tube video...good job.

This should be an example for everyone!!!

Do it right...make it legal...and then go enjoy it.

I am an O.E.M. for a number of products. I can generate a Legal Manufacturers Certificate of Origin for any MB I build, which means I can license and insure it if I choose.

Brett tried getting a moped tag here in the Tampa Bay area...they told him it isn't a motor vehicle...AND, go have fun!

For our area, I'll go on this premise until it becomes necessary to document what I build. The time will come I'm sure.

Jim
 
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