Yamaha Moto Bike, the resurrection.

[Mark Johnston]

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.

 

[Mark Johnston]

Found these with a quick search. Not much help though.

 

[Just Jeff]

Something like this?

 

[Andrew Gorman]

Those are standard bike parts. Just look for bicycle chain tensioner on ebay. Or you can get snazzy anodized aluminum ones (with steel working parts) on AliExpress:

5.22US $ |Bicycle Chain Adjuster Tensioner Fastener Aluminum Alloy Bolt For BMX Fixie Bike Single speed Bicycle Bolt Screw Bicycle L0303|Bicycle Chain| - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

 

[Bruce Turk]

Mark,
Yeah, well, ummm, like that... is that the actual Yamaha Motobike part?
Thanks for the picture!
Bruce

 

[Mark Johnston]

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]

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.

 

[Mark Johnston]

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]

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]

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.