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Makotosun

AT1 Front fork swap

  • Peakbiker
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AT1 Front fork swap was created by Peakbiker

Hi I hope you can help. I have a 1969 AT1 early model frame number 106937. Ever since I have owned it the front forks have been slightly bent there were slight rubbing signs on the forward facing surface of the inner tubes where they enter the lower section, these have become progressively more noticeable. I have seen a pair of secondhand fork legs for a 1972 model for sale in the UK. From the photograph in the advert the brake plate retaining lug on the left hand lower leg appears to be wider and shallower than mine. I have also noticed from parts lists that the part number for inner fork tubes vary from early to later models.
My question is. Can the outer fork tube lug be modified to suit my brake back plate or will the inner fork tubes off the later model work in my outer tubes? I would appreciate any help that you can offer.
27 May 2021 02:19 #1

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Replied by Gr8uncleal on topic AT1 Front fork swap

Is it not possible to just straighten and re-chrome your existing fork legs (all done in the same process)?

Fellow UK member Mauser used Dynasurf.
27 May 2021 02:38 #2

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Replied by RT325 on topic AT1 Front fork swap

"72 should have alloy lower sliders & a wider locating lug for the brake plate. I'm not sure 'without checking' that the later forks will slide in & be secured the same way although i'm thinking about my DT1 in that respect to changes so you might be lucky. If you had complete forks with yokes--triples as they seem to be called nowdays--then the complete set up 'should' drop in, just don't drop ball bearings everywhere like i did recently. Also you would need a later brake plate to make it an easy job & not a good idea narrowing the fork lug but in saying that you could--with a bit of hacksawing & chiseling-- widen the slot in the plate. Partzilla links here to look at if it helps.

www.partzilla.com/catalog/yamaha/motorcy...nt-fork-front-fender
www.partzilla.com/catalog/yamaha/motorcycle/1972/at2/front-fork
27 May 2021 04:29 #3

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Replied by RT325 on topic AT1 Front fork swap

i'd better add that the "72 tubes wont fit into the "69 lower sliders as "69 has a bush attached to the inner fork tube as well as other differences.
27 May 2021 04:33 #4

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  • Peakbiker
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Replied by Peakbiker on topic AT1 Front fork swap

Thanks very much for the prompt replies. Looks like straightening and re chrome is the way to go.
Cheers
27 May 2021 05:16 #5

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