Extended for tubes and internals swap

lumbee · Nov 29, 2021

I found a couple of threads on this but didn't really find an answer.

I just got a 4 over set of fork tubes from Mikes and have begun dissembling the stock forks to swap the internals. However, the part in the image below (dampener?) will not fit inside the new fork tubes. You can see in the picture of the tubes that the new tubes (on the right) have a smaller inner diameter on the lower part of the tube. Is this due to the year of the stock forks I have? I don't know the year of tubes these are. Does anyone know the year of the stock tubes I need so I can swap the internals over to these new/extended tubes?

e8nSAVZhURn4P7FHeupuLlILiHf0SZNIEW-Vwl7Hpq-A8wQtS7cX0Eg5EYJyU7OnytfDWhlD2hNHQHSjJhY_lmC-gGKApgJrtcV01R3uXYBD6MIr_n6optj3Y_AdfeJrTsKCsy_s6ixemKHPRhlfPaJzxTblIF9ukGOX5vbwtu2UQVEfPwiy1WJ3ysfyk6WdufQ8LAjzEpSIHNtXiZqJHWyglGp3t0GV55FgA1RlApGJdj11OqKbFhczlng13a1gddJw1OjKErQA3VH12IVZK7qAcHoY2Z231RKBJXu65R9hdIpqKVEzbwLONM-uBaJPedzw0Mv9FDpAyYdON1gJ8gHdmIRXIoSfGFxKILCmUvvXddlxaPcdgYT2yWrNzc6P5M_C2Ka8XLenywyM9hVMc2QJ2KRQKkNDwu2Jfiguc5EUxWVnIOaLRM_H9o5hsQ5EqSwBfJ2oLoSjXEbuzHFSfWT0tFhUwjWyup6gxV2m2ipSs-MBYdsi8A8usoZTcSNrf7Da9DvUdvcPOLQZ_9Oo_ln0czX2WSv_Qlp7bNjavYt3v9TbSIMEpsCb86iPShZMHaZWndci-CV_eEmBUodqwQq--dksDBo58M55syJFfMJn2_C1MVpqsB4cCJw-spPGFT8IkP8-yRjWTFVPqTaqXu2kiBDcfJO-inTUcKLwSEYJ9ZIHrHnuMgwWM20DB-0hE8Yu1FtdkoqMU7he8iBMiFi8=w1044-h784-no

Here are the internals:

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nj1639 · Nov 29, 2021

No pics showing but let me Kreskin here a moment..........
Hmmm.....perhaps you may be trying to put internals from a set of 35mm tubes into a set of 34's. That probably wouldn't work.

RustiePyles · Nov 30, 2021

70-76 are 34mm forks. 77-84 are 35mm forks. The internals will not swap between the two. All the 35mm forks are the same, and most of the 34mm forks are the same although I'm not sure about the earlier 34's.

GLJ · Nov 30, 2021

72/73 internals are different from 74-76. Will not interchange.

RustiePyles · Nov 30, 2021

GLJ said:
72/73 internals are different from 74-76. Will not interchange.

That was what I thought. :thumbsup:

lumbee · Nov 30, 2021

Just to clarify. These are the extended forks I purchased from Mikes:

https://www.mikesxs.net/yamaha-xs650-35mm-fork-tubes-4-set-2-for-77-84.html

So I need a set of 74-76 fork tubes/internals to put in these? Is it just 74-76, or will 74 and later years work?

jetmechmarty · Nov 30, 2021

lumbee said:
Just to clarify. These are the extended forks I purchased from Mikes:

https://www.mikesxs.net/yamaha-xs650-35mm-fork-tubes-4-set-2-for-77-84.html

So I need a set of 74-76 fork tubes/internals to put in these? Is it just 74-76, or will 74 and later years work?

You bought 35 mm fork tubes. '74-'76 fork tubes are 34 mm. I expect you new internals for '77 to '84 forks. See post #3.

Team Junk · Nov 30, 2021

You need 77 or later for internals to work with those tubes

nj1639 · Nov 30, 2021

What year is the bike?

lumbee · Nov 30, 2021

nj1639 said:
What year is the bike?

The frame or the forks? It's a basket case with w/cobbled together parts. From what others are saying here it sounds like the forks are earlier years.

GLJ · Nov 30, 2021

Before you go any further you should measure your trees and see what size they are.
Then see if the tubes you bought fit them.

lumbee · Nov 30, 2021

GLJ said:
Before you go any further you should measure your trees and see what size they are.
Then see if the tubes you bought fit them.

Oh I see you mean 34 vs 35mm. Yeah, I'll check that out for sure

RustiePyles · Nov 30, 2021

If you have 76 & earlier (34mm) lower legs and tripple trees none of that will work for those tubes either.

nj1639 · Nov 30, 2021

OK.
Since the forks go into the triple tree and the triple tree attaches to the frame....what year is your bike frame?

gggGary · Nov 30, 2021

Measure twice, buy once?
There's some darned good sleuths round these here parts, snap and post up some pics of your project and we can try to sort out what all you have.
The XS650 was in production for 14ish years. There are few parts in common between the first and last bikes.

lumbee · Dec 1, 2021

nj1639 said:
OK.
Since the forks go into the triple tree and the triple tree attaches to the frame....what year is your bike frame?

Bike is a 74. Will 77 and later trees work with this frame?

lumbee · Dec 1, 2021

This looks like a good deal:

https://www.ebay.com/itm/115065348095

The seller does not know the year, can anyone ID the year of this front end based on pics?

RustiePyles · Dec 1, 2021

35mm/77-84 i think

RustiePyles · Dec 1, 2021

RustiePyles said:
35mm/77-84 i think

But they're missing the springs, caps, and top yoke. If you're building a chopper you can get a better looking top yoke that will also drop your front end about 1.5". Springs and caps are readily available. Speedmotoco sells a nice top yoke here

Team Junk · Dec 1, 2021

Would it be cheaper to find tubes to match your current forks and sell the 35mm tubes ?

Extended for tubes and internals swap

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