skillzman1
XS400 Junkie
will a front end off an xs 650 special with the larger forks swap onto a xs400 if you use the triple trees and all...or will it require machining of the stem for the smaller xs 400 head bearings?
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curiousity question
- Thread starter skillzman1
- Start date
gentlemanjim
More Wrenchin than Ridin
They are both 35 mm fork tubes. Why switch?
hardtailed77
Never Finished
Don't they have the same size bearings too?
skillzman1
XS400 Junkie
Hmmm...I thought they were smaller on my 400...but the disc brake forks wont work with a drum brake wheel...or will they?
I have access to an 83 seca 650 ...but it has what looks to be an XS front rim...straight spoke vs the curved spokes on the rear..assumed that it had been changed.
I thought the front forks on my xs were 33mm.
I have access to an 83 seca 650 ...but it has what looks to be an XS front rim...straight spoke vs the curved spokes on the rear..assumed that it had been changed.
I thought the front forks on my xs were 33mm.
hardtailed77
Never Finished
I have a document somewhere that has Jap bike bearing, fork, axle, etc. specs.....I will try to find it today and post.
gentlemanjim
More Wrenchin than Ridin
If you go here and click on the part, it will tell you which other models it fits.
http://www.boats.net/parts/search/Yamaha/Motorcycle/parts.html
http://www.boats.net/parts/search/Yamaha/Motorcycle/parts.html
cdavismini
onemankustoms
xs400 forks are 33mm.xs650 have 34mm and 35mm forks depending on model.only way i know is to get your triple trees bored out to fit the bigger diameter fork tube of the xs650.
skillzman1
XS400 Junkie
I thought I read that somewhere.
hmusket
XS400 Addict
I have both an xs650 and xj550 triple tree. I plan to use an xj550 front end on my '81 xs400. If I get the time on Friday, I should have an answer.
hmusket
XS400 Addict
Got outside, had time to remove front end and try triple trees. Diameter of stems was no problem. Length is a different issue. XS650 neck measures about 7-1/4", XS400 neck measures 6-3/4". The 1/2" difference will not allow the top bearing retainer to tighten down because of the small ridge or stop on the triple tree stem. The XJ550 stem fits just right, but the issue with that is the size of the forks, which are 36mm, opposed to 35mm for the XS650. For me it is not a problem, because I plan to use the whole front end of the XJ550.
I noticed in the photo section a fellow who goes by the name Ringo, did a build using an XS750 front. Perhaps he could shed more light on the situation.
I noticed in the photo section a fellow who goes by the name Ringo, did a build using an XS750 front. Perhaps he could shed more light on the situation.
skillzman1
XS400 Junkie
interesting...thanks
ga650
XS400 Member
skillz,
the xs 750 front end I bought on ebay is a neat setup. allows dual brakes up front, a 35mm tube which will allow for wider variety of clip ons and suspension setups (cartridge etc.).
The stem length is OK, you will need to turn the stem down to accept the 400 sized bottom bearing though, top bearing seems to fit OK.
I got the whole setup, trees, forks and wheel for about 90 dollars at the door.
if you google "green bastard xs 400" he has the 750 setup on his bike, its very cool.
the xs 750 front end I bought on ebay is a neat setup. allows dual brakes up front, a 35mm tube which will allow for wider variety of clip ons and suspension setups (cartridge etc.).
The stem length is OK, you will need to turn the stem down to accept the 400 sized bottom bearing though, top bearing seems to fit OK.
I got the whole setup, trees, forks and wheel for about 90 dollars at the door.
if you google "green bastard xs 400" he has the 750 setup on his bike, its very cool.
gentlemanjim
More Wrenchin than Ridin
Can we get a link I tried google and search on the YOC - no luck
ga650
XS400 Member
Gramatron
Meat popsicle
Hey guys, I know it's years later but I was hoping to throw a 650 front end onto my 400 and get the dual disc setup. I'm trying to figure what I need to do between the bearings and steering stem to make the swap. Can you guys shed any light?
motoTrooper
XS400 Addict
Hey Gramatron, I just put an SR500 front end onto my XS400 and the stems are the same diameter, I would imagine they are the same for the XS650 too. Yamaha would not go out of their way to engineer and manufacture different stems for each model, too costly and pointless. I also think these guys before were confused on the subject.
I installed some new tapered bearings from Mike's XS for the 400 and everything fit easy peasey. I'm using an SR caliper on one side and the XS caliper on the other. Mirror copies.
I installed some new tapered bearings from Mike's XS for the 400 and everything fit easy peasey. I'm using an SR caliper on one side and the XS caliper on the other. Mirror copies.
Gramatron
Meat popsicle
Oh awesome, I've been eyeing a pair of forks on ebay. Guess I'll go ahead and pull the trigger. Thanks!
motoTrooper
XS400 Addict
Keep in mind when I say 'front end' it also means the triple clamps, fender, etc. I wouldn't try to bore out the 400 triple clamps to accept the larger fork tubes.
Hope it helps
Hope it helps
Gramatron
Meat popsicle
Agreed, the intent was to mount a 650 triple tree. I wanted check to avoid obvious fitment issues at the neck
