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 Post subject: Later USD triple trees on 89/90 frame
PostPosted: Tue Sep 01, 2020 10:03 am 
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Joined: Tue Jan 21, 2020 2:18 pm
Posts: 28
Location: Norway
model: 900 SS
year: 1990
I am fitting the triple trees from the later 900SS on my 89 and was adviced to use the 32005/26 bearings for the swap. They do indeed work, but the bottom bearing seems to recess further into the frame than the old bearing so the lower crown is hitting the frame. Has anybody else had this problem and how did You solve it. Additional spacer under bearing cup in frame or a spacer on the triple tree, or a bit of both?


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File comment: Bearing too far in so will not be able to get any preload on the bearing
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 Post subject: Re: Later USD triple trees on 89/90 frame
PostPosted: Sat Sep 05, 2020 7:20 pm 
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Joined: Sun Jul 26, 2009 7:35 pm
Posts: 106
Location: Haarlem, The Netherlands
model: 750 Sport
year: 1989
Hi,

Currently I’m doing the same. I’m using the original stem pressed in the USD triple tree. That should allow the original bearings and spacers to be used. Not sure if the steering bumpers need to be removed/filed off.

Assembly is planned as the new bearings arrive somewhere next week.

Cheers Joep


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 Post subject: Re: Later USD triple trees on 89/90 frame
PostPosted: Sat Sep 05, 2020 7:58 pm 
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Joined: Tue Jan 21, 2020 2:18 pm
Posts: 28
Location: Norway
model: 900 SS
year: 1990
With the 32005/26 bearings the USD stem for fine in the frame. But will have to sort out the height of the lower bearings.


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 Post subject: Re: Later USD triple trees on 89/90 frame
PostPosted: Sun Sep 06, 2020 12:59 pm 
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Joined: Sun Jul 12, 2009 1:56 am
Posts: 49
Location: Minnesota, USA
model: 906 Paso
year: 1989
I put a spacer under the lower race when I put a set of Showa forks from a 1995 900SS on a Sport


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 Post subject: Re: Later USD triple trees on 89/90 frame
PostPosted: Sun Sep 06, 2020 1:06 pm 
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Joined: Tue Jan 21, 2020 2:18 pm
Posts: 28
Location: Norway
model: 900 SS
year: 1990
Speedmade wrote:
I put a spacer under the lower race when I put a set of Showa forks from a 1995 900SS on a Sport

To be sure; that means You put the spacer in the frame under the bearing race?


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 Post subject: Re: Later USD triple trees on 89/90 frame
PostPosted: Mon Sep 07, 2020 3:36 pm 
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Joined: Sun Jul 26, 2009 7:35 pm
Posts: 106
Location: Haarlem, The Netherlands
model: 750 Sport
year: 1989
If you use the original stem which matches the steering head, the location of the bearing part on the stem matches the locations of the bearing part in the steering head. That is of course if you use the original spacers.

I did try to use the later USD stem but could not get it it work. I tried spacers under the bearings in the steering head but ended up with the bearings not fully matching the machined parts of the stem where the bearing should sit. I felt that that was unsafe. It seems that the bearing location on a later USD stem are further apart then on the original stem, which are spaced closer.

I hope this helps.

KR Joep


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 Post subject: Re: Later USD triple trees on 89/90 frame
PostPosted: Mon Sep 07, 2020 6:23 pm 
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Joined: Tue Jan 21, 2020 2:18 pm
Posts: 28
Location: Norway
model: 900 SS
year: 1990
That makes sense. I am thinking about making some spacers underneath the bearing races in the frame and pushing them further apart. This will also move the lower crown down which I also need. If this doesnt work using the later stem is the next course of action I think ;)
Thanks


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 Post subject: Re: Later USD triple trees on 89/90 frame
PostPosted: Tue Sep 15, 2020 7:27 am 
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Joined: Tue Jan 21, 2020 2:18 pm
Posts: 28
Location: Norway
model: 900 SS
year: 1990
Well, then its on. I ended up using the stem from the 91-97. I made a spacer under the bearing race on the stem (same height as the original). I also made spacers underneath the races in the frame and discarded the original ones. 5mm if I remember correctly. Had to grind away the sterring stops as they hit the lower frame rails. Only problem now is that the fork legs hit the upper frame rails and the steering stops in the frame doesnt hit the lower crown. I will get the lower crown welded so the it will hit before the fork legs touch the frame. Also fitted the front wheel after adapting the spacers. Waiting for calipers to see what I need to fo to make room for the discs :)
Pictures when I will find energy for tiresome resizing of pictures..


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