Motorized Bicycle Engine Kit Forum  

Sponsors



Go Back   Motorized Bicycle Engine Kit Forum > Bicycle Motor > DIY Home Built Motorized Bicycle (non kit)

DIY Home Built Motorized Bicycle (non kit) Post all about your home built rides here. Weedwacker motors, lawn mower engines ect. This area is for non kit builds

Reply
 
Thread Tools Display Modes
  #1  
Old 07-25-2016, 11:42 PM
msrfan msrfan is offline
Motorized Bicycle Elite Member
 
Join Date: Sep 2010
Location: Southern California
Posts: 1,646
Default 3D Motorsport Clutch on Briggs Powered Schwinn

Except for the clutch, this is a pretty traditional build for me. Standard Chicago Schwinn cantilever frame cruiser with a Briggs flathead engine. This bike is being built by my grandson, Greg, and me for his friend James's dad, Tim. He's given us some design parameters, like full fenders and rear rack, and is leaving the drive train to us. So we're going to experiment with the manual clutch.



First, I turned the sprocket down on a lathe and screwed it back onto the clutch basket, as it supports the bearing. Then I machined a solid 3 1/2'' pulley until it fit where the sprocket used to be. I fastened it to the basket with six countersunk screws from the inside. I may need to machine a pocket on the outside of the pulley for another support bearing.






Next I made a 5'' aluminum pulley with a 3/4'' center and broached a standard 3/16'' keyway to fit the jackshaft.






So we're starting with a 2 1/2'' engine pulley going to the 5'' jackshaft pulley for the primary drive. Using a standard Whizzer 15'' pulley on the rear wheel powered by the clutch pulley will give us the desired overall drive ratio, same as most Whizzers.
The engine will slide in it's mount to tension the primary and the rear wheel will do the final drive. That's the idea anyway so we can make a solid mount for the jackshaft/clutch assembly. The keyed shaft will be supported by bearings with the clutch sandwiched between them and the other pulley will be outboard.
That's as far as we got so far. I sold Tim a moped fuel tank and Greg will supply the motor. We've acquired the rear pulley and some heavy spokes also.
Next I'll lace the new spokes into the S-2 rims that came on the bike and install the pulley.

Last edited by msrfan; 07-26-2016 at 11:54 AM.
Reply With Quote
  #2  
Old 07-26-2016, 12:04 AM
3dmotorsportLLC's Avatar
3dmotorsportLLC 3dmotorsportLLC is offline
Motorized Bicycle Member
 
Join Date: May 2016
Location: San Diego
Posts: 33
Default Re: 3D Motorsport Clutch on Briggs Powered Schwinn

That is looking great so far. You won't have any bearing related issues as a result of belt tension- just tighten up the tension until it stops slipping.

If it's something that you're concerned with, you could always go with a 15T sprocket, which has the bearing directly in line with the sprocket teeth. Or as you suggested, press in a second bearing right next to the first.

If you want to go the latter route, let me know and I'll send you an extra bearing.
__________________
Danny Downs- Owner of 3D Motorsport, LLC
Check us out at http://www.3dmotorsport.net
Reply With Quote
  #3  
Old 07-26-2016, 11:56 AM
msrfan msrfan is offline
Motorized Bicycle Elite Member
 
Join Date: Sep 2010
Location: Southern California
Posts: 1,646
Default Re: 3D Motorsport Clutch on Briggs Powered Schwinn

Quote:
Originally Posted by 3dmotorsportLLC View Post
That is looking great so far. You won't have any bearing related issues as a result of belt tension- just tighten up the tension until it stops slipping.

If it's something that you're concerned with, you could always go with a 15T sprocket, which has the bearing directly in line with the sprocket teeth. Or as you suggested, press in a second bearing right next to the first.

If you want to go the latter route, let me know and I'll send you an extra bearing.
Thanks. I'll let you know if there's any distortion with tension. Don't want the friction plates binding in the basket.
Reply With Quote
  #4  
Old 07-26-2016, 12:57 PM
Tony01's Avatar
Tony01 Tony01 is offline
Motorized Bicycle Elite Member
 
Join Date: Nov 2012
Location: San Jose, CA
Posts: 778
Default Re: 3D Motorsport Clutch on Briggs Powered Schwinn

8.6 is a good ratio for a single. 45mph @ 5k on 26" tires. Nice job on the machine work.
__________________
I don't always listen to Alice in Chains..... but when I do, SO DO THE NEIGHBORS
MxTrq clutch tuning | 212cc 2spd | CVT tuning
Reply With Quote
  #5  
Old 07-27-2016, 10:02 PM
curtisfox curtisfox is offline
Motorized Bicycle Elite Member
 
Join Date: Dec 2008
Location: minesota
Posts: 3,751
Default Re: 3D Motorsport Clutch on Briggs Powered Schwinn

HO! Here we go, got to watch this. Thinking on buying one of these clutches myself. As always love your work and builds................Curt
Reply With Quote
  #6  
Old 08-01-2016, 04:52 PM
3dmotorsportLLC's Avatar
3dmotorsportLLC 3dmotorsportLLC is offline
Motorized Bicycle Member
 
Join Date: May 2016
Location: San Diego
Posts: 33
Thumbs up Re: 3D Motorsport Clutch on Briggs Powered Schwinn

Quote:
Originally Posted by curtisfox View Post
HO! Here we go, got to watch this. Thinking on buying one of these clutches myself. As always love your work and builds................Curt
We would certainly appreciate your business!
__________________
Danny Downs- Owner of 3D Motorsport, LLC
Check us out at http://www.3dmotorsport.net
Reply With Quote
  #7  
Old 08-02-2016, 11:41 AM
curtisfox curtisfox is offline
Motorized Bicycle Elite Member
 
Join Date: Dec 2008
Location: minesota
Posts: 3,751
Default Re: 3D Motorsport Clutch on Briggs Powered Schwinn

Working on my own version ( antique style old Rudge motor cycle ). If that falters then I will by. Mean time will watch msrfan's build, and maybe loner,LOL................l.Curt
Reply With Quote
  #8  
Old 11-03-2016, 03:39 PM
MkowaOweno MkowaOweno is offline
Motorized Bicycle Newbie
 
Join Date: Nov 2016
Location: Russia
Posts: 2
Default 3D Motorsport Clutch on Briggs Powered Schwinn

Got the Briggs outboard mounted on the boat couldnt run it on maiden voyage because we were on an electric only lake. Im going to get the steering wheel assembly throttle and shift cable made and connected next and then Ill see how it works on the river.
Reply With Quote
  #9  
Old 11-04-2016, 12:44 PM
scratchbuilder's Avatar
scratchbuilder scratchbuilder is offline
Motorized Bicycle Elite Member
 
Join Date: Jan 2015
Location: ca.
Posts: 536
Default Re: 3D Motorsport Clutch on Briggs Powered Schwinn

Wondering, reason for clutch mounted on Js...what is advantage? What happened to pics?
Reply With Quote
  #10  
Old 12-21-2016, 08:35 AM
msrfan msrfan is offline
Motorized Bicycle Elite Member
 
Join Date: Sep 2010
Location: Southern California
Posts: 1,646
Default Re: 3D Motorsport Clutch on Briggs Powered Schwinn

Quote:
Originally Posted by scratchbuilder View Post
Wondering, reason for clutch mounted on Js...what is advantage? What happened to pics?
Hey scratch, finally getting back to your question. The clutch mounted on the jackshaft allows for a narrower engine.

Meanwhile this build has stalled while the owner gathers more resources. The good news is I decided to use the belt clutch on a different bike and have a build thread with lots of photos.


http://motorbicycling.com/showthread.php?t=62250
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 06:19 AM.


Sponsors

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
MotorBicycling.com