Steering head bearing dimensions?

[makenzie71]

Anyone know them for the 600? 92 model, if it matters. Can't find it listed anywhere...

[slayermd]

You can try here. Might have to dig through the thread tho.......

Also try the Wiki.

If no luck, Yamaha_George will come and save the day with his notebook of FZR numbers.

[DonTZ125]

Top bearing is 47x25x15mm; lower is 55x30x17mm.

http://www.wemoto.com/ ; they're overseas, so shipping and exchange is horrid, but they do have interesting tidbits of data tucked away (like bearing sizes!) that you really have to dig for elsewhere.p

[makenzie71]

Thanks, Don! That's awesome information...the FZR600 steering stem is the same length as the GS750, and the bearings are the same size. Perfect upgrade.

[cad600]

You can find the bearings on eBay all the time. I think I paid $30 for the set. The top and bottom bearing are different sizes as Don mentioned. But the FZR uses tapered needle bearings with a tapered bushing that goes into the steering neck. If the bearings for a GS are not the same, don't use them. If you don't want to use eBay, you can buy the bearing directly from the manufacture - http://www.endurobearings.com/other/bea ... pered.html - You are looking for these two bearings - 32005x and 32006.

[makenzie71]

You're right...I can find bearings on eBay all day. But, finding the bearings and finding the proper bearing dimensions is not quite the same thing.

It doesn't matter tapered or straight...the stem is straight and, really, the collars on both bikes are straight. Tapered bearings have a longer life and a higher threshold, but both are compatible if you have to rely on the tapered bushing to seat the bearings.

The stems are the same dimensions...in the end, that's all that matters, no matter what variety of bearings either are "supposed" to use.

Anyone happen to know if YZF600R's share the same size bearings, by chance?

[95FZR600]

You're right...I can find bearings on eBay all day. But, finding the bearings and finding the proper bearing dimensions is not quite the same thing.

It doesn't matter tapered or straight...the stem is straight and, really, the collars on both bikes are straight. Tapered bearings have a longer life and a higher threshold, but both are compatible if you have to rely on the tapered bushing to seat the bearings.

The stems are the same dimensions...in the end, that's all that matters, no matter what variety of bearings either are "supposed" to use.

Anyone happen to know if YZF600R's share the same size bearings, by chance?

Maybe, explain what you are trying to accomplish and we could help you better.

[makenzie71]

Oh my accomplishment is putting an FZR600 front end on my GS750...I'm currently running some hopped up showa forks that were top of the line in 1979 but sort of leave me wanting now. FZR's, though, have a really great front suspension...I've ran FZR forks on my FZ600 race bike and on two one-off racers with great results.

The thundercat, thing, though...another fella with a GS750 happens to have access to a YZF front end, which is also pretty good, and is curious if it's as compatible.

[cad600]

Do you know the dimensional size of the GS bearings? If so, I would go look at the link I posted earlier and see if you can find some that match the GS steering neck and a FZR stem (which is 1.0" for the top and 1.18" for the bottom). If not, 95FZR600 and I have been working on a universal fork swap that would allow you to bolt any fork set you want to to any bike. Here is a link to that topic so you can read a little about it. viewtopic.php?f=30&t=2561 This idea was adapted from someone Yamaha_George knows and is race proven.

[makenzie71]

yeah...the GS750 actually uses the same size bearings and I measured earlier...the steering stems are even the same length. If donTZ125 is correct on the FZR sizes, it'll be a direct swap.

[cad600]

Good deal then. Post up some pictures of it when you are finished.

[sweekster]

The thundercat, thing, though...another fella with a GS750 happens to have access to a YZF front end, which is also pretty good, and is curious if it's as compatible.

The FZR uses the same stem as the Thundercat so you'd be able to accomplish the same feat with either front end.

[95FZR600]

Opened up all sorts of doors here. Let us know how it works out and post some pics.

[makenzie71]

Oh yeah here ya go...

I mean, I doubt it's somethign any of you will ever actually do but still...

You WILL have to have new headlight ears.

You WILL have to add an 8mm spacer under the lower bearing on the steering stem.

There are NO TABS for mounting your gauges.

Aside that, even the ignition cylinder bolts up.

You also lose your steering stops. A little welding will fix it for me but not everyone can weld.

Mounted up...

Took a bit of effort to get her there but worked out ok in the end...I wish I didn't have four other people's bikes in my garage so I could have had some room but oh well...



Had to cut an 8mm spacer to stack the lower bearing on. 5mm would have been fine, keep that in mind...it was hard to measure, though, so I went overboard to make sure. I'll be cutting a proper grease-bucket style insert to stack the bearing on later. My current stock was a little lacking for the project.



Oooooooo nice clip-ons too...