79F Centerstand attachment?

[clcorbin]

Gents,

I had to remove my centerstand on my 1979 standard. The hardware had been replaced in the past (probably after the original owner crashed and repaired it) (it is 3/8" grade 5 hardware...) and it is definitely not stock.

As it came off, the left mount had a spacer in the centerstand that went over the bolt. The outside hole is much smaller than the inside hole, so the spacer would hit against the outside of the bracket but would "poke through" the inside of the bracket. When the nut was tightened down, this would "crush" the spacer against the outside of the mount and cause the centerstand to pivot on the spacer instead of the bolt. The left side also had this funny bracket around the outside of the frame bracket as well:



You can also see the bolt that was in there and the spacer. The right side was setup the same except it was missing the spacer and it did NOT have the bracket around the frame mount.

From looking at the (crappy) parts diagram I could find, it appears the stock center stand bolts were large diameter that provided the pivot surface directly with a smaller diameter threaded stud that was installed from the inside and then had the small nut installed on the outside to secure the stand and provide the pivot points. The only reason I can think that my bike would be different is that it does have a Kirker 4-1 exhaust on it (again, OE installed. Probably after his crash!). But for the life of me, I can't figure out what that little bracket would do.

Does anyone know what that bracket is for? Also, does anyone know were I and get the correct bolts and nuts for the centerstand? I was planning on making up a new spacer and getting 10mm bolts to refasten the stand, but if the factory had better hardware with the "spacer" already on the bolt, that would be a better solution in my opinion. Anyone have any of these things I could have/buy?

Thanks for the help!

[donebysunday]

Gents,

I had to remove my centerstand on my 1979 standard. The hardware had been replaced in the past (probably after the original owner crashed and repaired it) (it is 3/8" grade 5 hardware...) and it is definitely not stock.

As it came off, the left mount had a spacer in the centerstand that went over the bolt. The outside hole is much smaller than the inside hole, so the spacer would hit against the outside of the bracket but would "poke through" the inside of the bracket. When the nut was tightened down, this would "crush" the spacer against the outside of the mount and cause the centerstand to pivot on the spacer instead of the bolt. The left side also had this funny bracket around the outside of the frame bracket as well:



You can also see the bolt that was in there and the spacer. The right side was setup the same except it was missing the spacer and it did NOT have the bracket around the frame mount.

From looking at the (crappy) parts diagram I could find, it appears the stock center stand bolts were large diameter that provided the pivot surface directly with a smaller diameter threaded stud that was installed from the inside and then had the small nut installed on the outside to secure the stand and provide the pivot points. The only reason I can think that my bike would be different is that it does have a Kirker 4-1 exhaust on it (again, OE installed. Probably after his crash!). But for the life of me, I can't figure out what that little bracket would do.

Does anyone know what that bracket is for? Also, does anyone know were I and get the correct bolts and nuts for the centerstand? I was planning on making up a new spacer and getting 10mm bolts to refasten the stand, but if the factory had better hardware with the "spacer" already on the bolt, that would be a better solution in my opinion. Anyone have any of these things I could have/buy?

Thanks for the help!

Don't know what that extension did except maybe raise the rear tire a little higher.
I have bolts but they are for XS650 and the holes would need to be enlarged on you 11 for them to fit. Why the XS650 would have larger bolts ? ? ?
Shipping get them to you.

Done };~)

[Ken Talbot]

Gents,
Does anyone know what that bracket is for? Also, does anyone know were I and get the correct bolts and nuts for the centerstand? I was planning on making up a new spacer and getting 10mm bolts to refasten the stand, but if the factory had better hardware with the "spacer" already on the bolt, that would be a better solution in my opinion. Anyone have any of these things I could have/buy?

Thanks for the help!

Those bolts are called "shoulder bolts". A quick google search should turn up all sorts of suppliers.

[clcorbin]

Those bolts are called "shoulder bolts". A quick google search should turn up all sorts of suppliers.

Do you have the measurements for them? Especially the diameter, the length of the shoulder and the diameter of the threaded stud?

[clcorbin]

Don't know what that extension did except maybe raise the rear tire a little higher.
I have bolts but they are for XS650 and the holes would need to be enlarged on you 11 for them to fit. Why the XS650 would have larger bolts ? ? ?
Shipping get them to you.

Done };~)

Done,

Thanks for the offer! I might take you up on that if I can't track down the correct ones. For some reason, I don't want to drill on the frame if I don't have too... I am also assuming that the larger diameter part is the threaded stud part, no the shoulder part?

[clcorbin]

I THINK I know what the U bracket is for. The Kirker 4-1 exhaust does not have the rubber bump stop on it like the factory exhaust does. This little bracket will be pinned between the left "arm" of the centerstand and the frame rail when the centerstand is up and it will prevent the centerstand from rotating all the way up. This SHOULD provide the clearance between exhaust and the centerstand cross support.

Of course, it still doesn't have any damping in there, so you do still occasionally hear the centerstand pop down and then smack the bracket after hitting a hard bump. But at least the exhaust doesn't get banged up.

[donebysunday]

Done,

Thanks for the offer! I might take you up on that if I can't track down the correct ones. For some reason, I don't want to drill on the frame if I don't have too... I am also assuming that the larger diameter part is the threaded stud part, no the shoulder part?

It's the shoulder that is bigger the threaded part is the same. While back someone on this list needed the bolts to replace a center stand that had been taken off by the PO. I checked the ones I had and found the difference I contacted a buddy for the bolts and he sent them to him, turns out they were the same thing I had.

Maybe that person would jump in here and tell us how that worked out ?

[clcorbin]

It's the shoulder that is bigger the threaded part is the same. While back someone on this list needed the bolts to replace a center stand that had been taken off by the PO. I checked the ones I had and found the difference I contacted a buddy for the bolts and he sent them to him, turns out they were the same thing I had.

Is the length of the shoulder the same? Worse case, I can always put the bolts in the lathe and turn the shoulder diameter down. I would refer not to have to rethread if I don't have too...

Of course, as I don't have an original bolt to play with, I have no idea how long the shoulder should be for the factory bolt.

[fredintoon]

Is the length of the shoulder the same? Worse case, I can always put the bolts in the lathe and turn the shoulder diameter down. I would refer not to have to rethread if I don't have too...
Of course, as I don't have an original bolt to play with, I have no idea how long the shoulder should be for the factory bolt.

Hi CL,
designers have little obsessions. Had a boss one time that wouldn't pass ANY design that had a spring in it. We told him,
"but your car is FULL of springs"
"I didn't design the f**ker"
Likewise, the Yamaha design office is obsessed with shoulder bolts, they put the bastards everywhere including where they shouldn't.
(XS650 owners will remember the 14mm end of the 16mm swingarm bolt falling off with scary consequences)
Your best fix is to use a standard bolt and turn up a simple sleeve to fit over it. Use a fender washer under the bolt head.

[Ken Talbot]

Hex head size 17mm
Self locking hex nut size 14mm
Shoulder diameter 14mm
Shoulder length 40mm
Thread size, pitch M10x1.25
Thread length 16mm

[clcorbin]

Ken,

Thanks for the specs! That is what I needed!

I've been thinking about another approach. Take a standard 14mm bolt with a long enough unthreaded shank and then cut it to 40mm. Then, drill and tap the end to take a M10 x 1.25 bolt. Basically, it would be an internally threaded spacer with a bolt head on it. And drilling and tapping that would be a LOT easier than single point threading the stud.

[TopCatGr58]

Hey Corbin,

That's too much work! Okay, 14mm = 0.546875". 1/4" NPT pipe is 0.54" diameter. Sch 40 ID will be about 9mm or very close to 3/8" or 5/16" ID, so get the pipe, cut it to length, then just run the bolt with fender washers on both ends. JAT! Granted, pipe isn't quite as strong as a solid bolt.

There's plenty of room beyond the end of the section that the shoulder needs to be. I would think you should be able to find a bolt that is close to the 1/2" ~ 17/32" size with a long enough shoulder where you could just put either a spacer or bunch of washers to fill in the space beyond the end of where you need the shoulder, so that you could still just put a self locking nut onto the end of the bolt....who cares if the bolt sticks out a bit longer thru the hinge point!

T.C.

[3Phase]

Clint,

Unless you're just totally into making new bolts I have both of the center stand bolts (somewhere...) from my wrecked XJ11 that will never need them again.

Send a PM with your address if you want them and you can have them for shipping.


.

[clcorbin]

Clint,

Unless you're just totally into making new bolts I have both of the center stand bolts (somewhere...) from my wrecked XJ11 that will never need them again.

Send a PM with your address if you want them and you can have them for shipping.


.

Scott,

Thanks! I'll send you a PM now. Sorry to hear about your bike!

[3Phase]

Parts on the way

Not a problem, Clint!

I didn't wreck the bike, I just bought it for parts and the P.O. is fine or I wouldn't have even touched it.

.