XS750 front end

staggers · Feb 9, 2016

The other night I was over at Phil's place and he noticed something odd with my forks!
After a bit of measuring we found out they are 36mm forks off an XS750! It looks like I have a complete 750 front end on the bike! the twin disks appear to be of smaller diameter than the stock 650 too.
Has anyone else on here got this setup? I'm wondering to rebuild these forks or just get a 35mm standard front end for it? The forks are in a bad state and need re hard chroming for a start and then the rest new seals and all.

These forks have been on for a long time! why would someone go through this much effort to put these forks on?

gggGary · Feb 9, 2016

The normal reason is bone yard Bill smooshed together what he had to make a runner out of 2 or more junk bikes. Since those tubes are toast, either better XS750/850 tubes or back to an XS650 front end, whatever comes to hand. The wheel, calipers are the same so you need at least a XS650 rotor and complete fork to swap back. The 750 stem needed to be ground pressed out of the lower triple and swapped with a 650 stem to do the fork swap UNLESS someone just wedged the 650 triple clamps open and jammed the 36mm tubes in there. :yikes:

(I have seen it done before)

fredintoon · Feb 9, 2016

staggers said:
- - - It looks like I have a complete 750 front end on the bike! the twin disks appear to be of smaller diameter than the stock 650 too. - - - These forks have been on for a long time! why would someone go through this much effort to put these forks on?

Hi staggers,
like Gary said, it's likely what the dreaded PO had available to get the bike on the road again after a major mishap.
Suggest you check if the frame is still straight, too.
Mind you, if the XS750/850 forks were in good shape it'd be a valid upgrade.
If it were mine I'd look for 36mm fork tubes in better shape and do a fork rebuild.
And yeah, the XS750/850 did come with the same smaller size front disks that are on a rear disk XS650.

XSLeo · Feb 9, 2016

You don't mention what year your frame is. The 70-73 bikes used a shorter neck. This shorter neck is the same as the XS750 neck. If your bike is on of these early bikes then no stem swapping needed.
You only need to swap stems if your frame is 74 and up.
Leo

FLEA · Feb 9, 2016

sometimes front end was changed over for sidecars ,have a project 73 tx650 with same set up that po ran with a chair

gggGary · Feb 9, 2016

front motor mount - later long neck frame

most likely an 80 special.

fredintoon · Feb 9, 2016

Hi Gary,
rear disk brake, click-down seat mounts, front frame bracket for rectangular reflector, has to be 1980 Special.
Hi Leo,
bike already has some kinda 36mm 'trees installed, eh?

nj1639 · Feb 9, 2016

The cinch bolts on that lower triple are machined to be tightened from the side, just like the stock triple on the 35mm fork setup. The cinch bolts on my xs750 triple are tightened from the front......suspecting those tubes may have been whammer-jammered into the triple at worse or the triple was machined to receive the 36mm tubes- more likely as there doesn't appear to be an inordinate gap at the cinch.
OR
It's a stock 36mm triple that tightens from the side, and not sure what year and model xs750 that would be........

gggGary · Feb 9, 2016

The plot thickens??

Maxim 750 triple.

The maxim bottom tubes are different than the ones he has.

fredintoon · Feb 9, 2016

Hi Gary,
if REPEAT IF staggers hybrid fork has a Maxim triple tree set on the XS750 Standard fork legs it'll do the reverse of the XS750/850/1100 Standard tree/Special fork leg hybrid that XS series sidecar operators use to lessen to lessen the front wheel's steering trail.
Again, IF it's like that the bike will steer really heavy.

staggers · Feb 9, 2016

Spot on, it is an 80 special. I've stripped the whole bike down to a bare frame now and just from a visual inspection I can't see any damage or bent tubes on the frame but will have to check the alignment somehow?
I've got the trees off too so I'll put up some pics tonight and see what you all think? I think they are stock 35mm triples just from comparing photos with others.

staggers · Feb 9, 2016

here's a few pics of the triples

nj1639 · Feb 10, 2016

There's a rise of 3mm that sticks up on the lower triple that the race sits on, characteristic to the 35mm triples- and though the pics are a wee dark I can see that in pic #1. Also in pic #3 there's a pretty good gap in that cinch. Could be 1/2 a mm was removed off the tube slots or they whammer jammered the tubes in.
If you're thinking of going stock 35mm I'd consider putting the cinch bolts in and tightening them down for a measure, to see if they'll grip a 35 mm tube. If they were forced to accept the 36 mm tube without any metal being removed there's no telling what condition those tube slots in the triples'll be in.....as in stretched or possibly out of round. Don't even want to think about stress fractures.......

The pikey 84 · Jun 14, 2018

I have a 73 tx650..anyone know if a 73 tx750 triple tree stem will fit into my 650 neck? If so what bearing would I need to get I'm want to go with tapered bearing..any help would be greatly appreciated.

XS750 front end

staggers

XS650 Enthusiast

Attachments

gggGary

If not now, When?

fredintoon

Fred Hill, S'toon.

XSLeo

XS650 Guru

FLEA

XS650 Guru

gggGary

If not now, When?

fredintoon

Fred Hill, S'toon.

nj1639

Paleo-simplistic

gggGary

If not now, When?

fredintoon

Fred Hill, S'toon.

staggers

XS650 Enthusiast

staggers

XS650 Enthusiast

Attachments

nj1639

Paleo-simplistic

The pikey 84

Xs650 operator

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