WWII WLA tribute w/sidecar

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silverbear

The Boy Who Never Grew Up
Jul 9, 2009
8,325
670
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northeastern Minnesota
How did I miss this thread? Wow! Your Dad is one lucky old guy. There are a lot of things to admire in the build, but the absolutely most beautiful, awesome thing is a son making a cool bike for his dad. Well done, sir...
SB
 

fasteddy

Well-Known Member
Feb 13, 2009
7,454
4,920
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British Columbia Canada
That bike and sidecar are sure looking sweet. Your Dad won't have to stop people on the street to show them the bike because they will be stopping him to see it.

Steve.
 

RicksRides

Member
Feb 22, 2012
864
6
18
osceola IN
I made a dash piece to cover the area between the 2 tank halves,mounted the head light and speedo. The little one is my 2 y.o. grandson RJ, I turned around after setting the camera down, see the look I got after telling him he had to get down. (3rd pic)
 

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cannonball2

Well-Known Member
Oct 28, 2010
3,682
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Colonial Coast USA.
Thats awsome RR! You have manufactured an M/C and a dang cool one at that! Might as well start gathering up parts to build RJ something, doesnt look like hes gonna let you off the hook . Took me about 3 tries to get the gearing to suit me with my 125. What are you going to run?
 

RicksRides

Member
Feb 22, 2012
864
6
18
osceola IN
CB2, Ive got a 13t front and a 39t rear just for a starting point but there are plenty of tooth sizes available for this engine and the rear rim is off a 60s cb160. Any guesses (idea) on what i should run (its a 18 in rim w/tire 23 in) Oh and already have the parts for a build for RJ (20in. JR. BTR using 98cc 2 stroke)
 
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cannonball2

Well-Known Member
Oct 28, 2010
3,682
221
63
Colonial Coast USA.
CB2, Ive got a 13t front and a 39t rear just for a starting point but there are plenty of tooth sizes available for this engine and the rear rim is off a 60s cb160. Any guesses (idea) on what i should run (its a 18 in rim w/tire 23 in) Oh and already have the parts for a build for RJ (20in. JR. BTR using 98cc 2 stroke)
That gearing would be fairly high for the little 125 in the situation its in. I am sure you want it geared on the low side to pull the load of the rig and two people. Probably the thing to do is to arrive at a desired top speed and gear for it. The internal primary gearing is 4:1 on an auto clutch and I dont remember exactly but close to 3.8:1 on the manual. The top gear is close to a 1:1, so at 7500rpm you are getting about 1875 at the engines sprocket auto or 1973 manual. This is low to mid 40s using your specs. Probably ok if where you are is all flats. If you drop to a 10t front sprocket, top speed is in the low to mid 30s and Im sure the 125 would be happier about it. You can just plug the front sprocket rpm(1875 or 1973) for what ever clutch system you have into a gear calc in the single reduction mode to get your top speeds @ 7500rpm the engines hp peak. They will rev higher if needed but I use this figure as max continous use. Your final drive is a 3:1 , my ultimate final is around 2.2:1 It pulls it pulls it well, but its just a 120lb bike and a 170lb rider. Hope this helps.
 

RicksRides

Member
Feb 22, 2012
864
6
18
osceola IN
Well more progress on Dads MC. I installed a headlight and Klaxon (OOGA)horn on the sidecar. Decided to use cables for the 2 rear brakes, mounted the levers down at the floor board, I'll mount a pad on them to be used as a brake pedal. Also mounted the rear turn signals and modified a trailer light to use as the brake/tail light. Ive got to seal the tank, run the wiring, install the carb and exhaust, as well as a few odds and ends and she'll be ready for her maiden voyage!!!!!!
 

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RicksRides

Member
Feb 22, 2012
864
6
18
osceola IN
The Ooga horn is LOUD, really, LOUD!!! 10 bucks at HF, a little bit of flat black and it looks like it belongs there. It should get peoples attention.
 

fasteddy

Well-Known Member
Feb 13, 2009
7,454
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British Columbia Canada
Your build is looking even nicer as you finish it up. As they say, the Devil is in the details.

I'll bet that the horn will make the errant drivers need to go home and change their cloths.

Steve.