Yamaha Moto Bike, the resurrection.

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Bruce Turk

'Lil Knee Scuffer
Feb 23, 2020
15
59
WALDEN, NY
Back in 1975 my parents bought me a Yamaha Moto Bike------- I just noticed it hanging in the parts shed where it hasn't moved in at least 30 years and decided to Google it. That's how I found you guys/gals. I have been a vintage car restorer for 32 years and have done 8 complete restorations; I still own all 8 cars. Quite frankly my back is not up for restoration number nine, so I thought I would tackle something a bit less labor intensive.

So here it is, my old Moto Bike. It was originally orange and since I was a Hot Rod kinda kid, I quickly sanded off the original paint and covered it in metallic blue. The bike was heavy, so I put it on a diet, throwing away the kick stand, rear fender, chain guard, reflectors and cutting off part of the tubular frame that supported the rear fender. The handle bars were thrown out and replaced with something more chopper-like... I'm sure other modifications were made along the way.

So here I am, age 59, looking at my old ride. I would like to undo my childhood modifications where possible, by sourcing original parts. That means I need the parts listed above, a paint code and hopefully a decal set. As luck would have it I have access to a machine shop at work, so replacing the missing piece of tubular frame will not be difficult. We can bend one up and Tig it in.

I don't recall ever replacing the rims, do they look original to you?

Let the fun begin.
Regards,
Bruce Turk

YAMAHA MOTO BIKE 004.JPG


YAMAHA MOTO BIKE 005.JPG


YAMAHA MOTO BIKE 006.JPG


YAMAHA MOTO BIKE 007.JPG


YAMAHA MOTO BIKE 009.JPG


YAMAHA MOTO BIKE 010.JPG


YAMAHA MOTO BIKE 011.JPG
 

Bruce Turk

'Lil Knee Scuffer
Feb 23, 2020
15
59
WALDEN, NY
Thank you for the reply. I found the decals, thanks for the tip. What orange paint did you use? Could I trouble you for a measurement or two so I can bend the tube for the rear fender? I can make a drawing with the measurement points that I will need.
 

West is the Best

Look Ma, No Hands!
Apr 12, 2018
60
56
Covina, CA, USA
Those Yamaha's were cool bikes. I have a vintage '73 Yamaha MX360 dirt bike that I have had for a few years that was fun to ride in the desert.
I brought this Bicrosser BMX bike on eBay s few months ago. It is pretty cool; Suntour 3 Speed, drum brakes, rear shocks.
I actually want to make this ridable so I am attempting to make it fit. I was able to fit a standard 26" crank with no petal strike issues. I put a long stem on it.
I have a seat post coming. Cleaning up the wheels and brakes and replacing the tires with yellow walled streets. If all goes well, I will blast and powder coat the frame lemon yellow. I plan to replace the shocks with some stiffer minibike shocks. These bottom out a bit; not a kid anymore...
1146923
 

Bruce Turk

'Lil Knee Scuffer
Feb 23, 2020
15
59
WALDEN, NY
Now that is a very interesting build indeed. Looking forward to seeing more progress shots.
 

Bruce Turk

'Lil Knee Scuffer
Feb 23, 2020
15
59
WALDEN, NY
Now that the bike is broken down to parts, I will fix the frame in a couple of spots, followed by paint. I know finding an original handlebar will be next to impossible, so I will look for something close. Any suggestions would be appreciated. The seat will be an easy fix, I just have to straighten out the metal pan, then replace the foam and vinyl. I am missing the chain tension bolts and associated hardware that pulls the wheel back, can anyone provide a nice clear photo so I can fabricate them?

motobike 010.JPG
 

Mark Johnston

Wore out three sets of tires already!
Apr 16, 2017
512
Phoenix
My axle adjusters are missing also. Maybe the manual has photos or drawings to go off of? I see manuals on eBay from time to time.
 

Bruce Turk

'Lil Knee Scuffer
Feb 23, 2020
15
59
WALDEN, NY
Mark, From the pictures that I have seen, they look like "U" shaped channels slip over the frame. The threaded bolt adjuster must have an eye that goes over the axle. My guess is the eye is very flat, like a flat washers thickness. If I had just one close up picture I know I can make them. If I make them I'll make a few extra sets so you can have one.
 
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Mark Johnston

Wore out three sets of tires already!
Apr 16, 2017
512
Phoenix
If I remember correctly you are right. Seems like they were like a washer with a threaded rod offset to clear the dropouts, with a stamped steel cap on the end of the dropouts to tighten against.
 

Andrew Gorman

Cruisin' on my Bluebird
Jun 15, 2008
3,019
Pasadena (Hastings Ranch), United States
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Reactions: Bruce Turk

Bruce Turk

'Lil Knee Scuffer
Feb 23, 2020
15
59
WALDEN, NY
Mark,
Yeah, well, ummm, like that... is that the actual Yamaha Motobike part?
Thanks for the picture!
Bruce
 

Mark Johnston

Wore out three sets of tires already!
Apr 16, 2017
512
Phoenix
Mark,
Yeah, well, ummm, like that... is that the actual Yamaha Motobike part?
Thanks for the picture!

Bruce
If my memory is correct I believe the photo posted by Just Jeff is what you need. If it isn’t the original part, it will certainly do the job.
 

whopperchopper

Finally riding a big boys bike
Jun 2, 2012
198
Those adjusters have been on eBay before. Genuine Yamaha. Seat down tube has a patten pending decal that is not reproduced as far as I know, so try to save it if it's on your bike, look closely on mine and you will see it. I used hydrolic oil #46 in my forks, According to the Moto-bike service manual the right side (spring side) takes 116cc and the left side takes 130cc you can also use #32 hydrolic oil aka jack oil.
 
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Reactions: Mark Johnston

Mark Johnston

Wore out three sets of tires already!
Apr 16, 2017
512
Phoenix
Good info! I’m sure mine need new seals, if I remember right they’re the same as the YZ-50 forks of the same era? Still available?
 

whopperchopper

Finally riding a big boys bike
Jun 2, 2012
198
Mine don't leak but I don't ride it, I took my seals which looked good, washed them with soap and water, dried, then soaked them in brake fluid overnight to soften them a bit , then soaked them in clean #46
Until they were ready to install.
 

Bruce Turk

'Lil Knee Scuffer
Feb 23, 2020
15
59
WALDEN, NY
Those adjusters have been on eBay before. Genuine Yamaha. Seat down tube has a patten pending decal that is not reproduced as far as I know, so try to save it if it's on your bike, look closely on mine and you will see it. I used hydrolic oil #46 in my forks, According to the Moto-bike service manual the right side (spring side) takes 116cc and the left side takes 130cc you can also use #32 hydrolic oil aka jack oil.
I just ordered a set on EBay, they are taking a slow boat from China and should arrive in a month. I should be ready for final assembly around then. Thanks for the hydraulic oil info. I ordered the 5/8" O.D. steel tubing that I need to replace the missing section of the frame today from McMaster Carr. I also ordered four low shoulder 10mm x 25mm shoulder bolts to replace the studs that the rear shocks attach to. Mine were bent and stripped so I cut them off and drilled them out to fit the new bolts, which I will weld in place. My patent sticker is long gone, I sanded it off when I repainted the bike metallic blue. Next up is seat repair.
 
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