Wtb: Yamaha supermini swingarm

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9/26/2018 7:32 PM

Looking for a swingarm only.

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9/27/2018 8:46 AM

good luck finding an OEM for a realistic price.
as I recall Rock river used to build them as well as Chris Aldredges dad. I built a couple back in the dayout of two small wheel swingers. It is very easy to do, sleeved together with a billet chunk inside. just need an Aluminimum welder. I used to have detailed pics of the process but I cannot find them.
I still have one on my TTR 150 with YZ suspension Photo Photo

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9/27/2018 10:16 AM

Thanks TJ. I bought a spare small wheel swing arm and took them to a fabricator. He said he would do it but suggested I find a factory one. I may just roll with it. Any idea what alloy of block you used?

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9/27/2018 12:51 PM

I think it wa 6061. I found it in the exact dimensions of the ID. just had to round the corners a little and it slid right in.Hard to tell in the pic but I made the matching cuts in a V shape for sdded strength and welding surface. I want to say I only added like 1 1/4" in length. I did alot of research and measuring other superminis.
also on the inside of the arm I drilled a 1/2" hole on each part that was also plug welded for strength.

you can find stock small wheel swingers on ebay for like $20 all day long.

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9/27/2018 1:19 PM

Thank again for the info! We are going for it. I'll post some pics when done. Mods, feel free to move to tech help/race shop.

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9/30/2018 2:01 AM

Hi guys, are the supermini bikes just what we call big wheel size? 19 inch front 16inch rear?
Over here in nz we had both small wheel and big wheel 85cc yz and kx too in the 90s
I know that your super minis are 100-112cc ish size but was unsure what else was changed
Thanks

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