1991 FZR1000 front wheel

[Yamifj1200]

  Does an FZR have upside down forks?
DavidR.

Yes, I have a set on 1992 FZR USD forks on my '84... I love 'em.

Pat, that sure is pretty......


Eric M

[Pat Conlon]

Thanks amigo!

Pat, that sure is pretty......
Eric M

[racerman_27410]

Direct sunlight on that could damage an admirer's eyes...... 

You got her looking sweet Pat   

KOokaloo!

[jvb_ca]

Pat...that is just fricken georgeous... ..

Cheers...Jake

[ccsct203]

So I received the bearings and pulled the old ones out. The old bearing measures 12mm not the 13mm i first thought.
Thats a difference of 2mm total or an 8% difference or about .080 inch.
I have not measured my Fj bearings but I will tonight.
I don't ride over the 80-90mph mark.
The bearings look substantial and give me no reason to believe they would not hold up since they are again made to handle high side loads and up to 70k rpms.
I wonder what the after market bearings are good for in rpm?
If i knew a engineer then I would talk to them. But since I only have the info from the manufacturer and the spec sheet to go by i'll have to try it and report back.
I have a 3.0 inch wheel with oem bearings in case  i notice issues with this 3.5 inch wheel.

[captaudi]

Hey, new guy here. I did this mod last winter and installed a 91 FZR1000 front wheel in my 93 FJ. I was able to find an industrial bearing that width and OD  was correct for the wheel, the change is it has a 3/4" ID. The I bought some 15MM ID steel bushings from McMaster Carr and turned them to a 0.002" press fit in the bearing and the right side spacer. I reused the FJ speedo drive. This gave me a 2MM +/- wall thickness bushing, I felt comfortable with this. I put 7K miles on this setup last year and it was flawless. This included a day of very aggressive twisties and elevated speeds.

If you want i can get you the numbers for the bearing and bushings.

Dan

[TRoy]

If you want i can get you the numbers for the bearing and bushings.

Hi Dan... please do! Thanks!

[captaudi]

OK, lets see if I can get this right.

The front bearings are 6203-2rs 3/4". If you type that into eBay you will find a common agricultural and industrial bearing. I assume it is a mongrel to use a imported (metric) component on a standard 3/4" shaft. I went through all of the listings and found one that listed the specs. Matched them against the ratings in Mcmaster carr and found one of what I felt was high enough quality.

The bushings are McMaster Carr #7811K29 15mmx21mmx16mm bronze alloy rated for 7500 lbs. I made a mandrel in the lather and turned the outside diameter to a 0.002" press fit in the bearing. Then trimmed them to length (12mm). I pressed them into the bearings with red loctite.

Use the FJ1200 speedo drive, and the r/s spacer from the FZR1000. Seals are to match the wheel.

The overall width of the stack is 1.5mm narrower than the fj1200 wheel, this means I am deflecting the fork sliders slightly. Jon Cain and I discussed this and he felt I was OK. In all things fork related I trust Jon's opinion.

The wheel is 2lbs lighter, the tire profile is better and now I have these 320mm rotors waiting to get the calipers spaced out. I may need some of Jon's CNC expertise for this.

Would I do it again? Maybe, now I need to see if I can adapt to the YZF600r forks. I should have gone the yzf route from the begining.

Cheers,

Dan

[ccsct203]

Thanks for the info.
I used all oem parts I ordered from Bikebandit.com
To make the center spacer I used a 1/2 x 6" piece of black pipe and cut it down to 95mm which is 2mm longer then the oem spacer.
as noted the new bearings are 1mm narrower then oem or 2mm total.
speedo drive-oem large seal-speedo ring-new bearing-1mm spacer-1991 wheel w/95mm x 1/2 black pipe spacer-1mm spacer-new bearing-oem seal-oem fj1200 left spacer
this was all assembled with the 1988 fzr1000 axle.
I'm waiting on my wheel paint to harden to reassemble everything.
7K miles... sounds good so far.
I do have the 1988 fzr1000 forks so no deflection necessary.

[captaudi]

Sounds like a good fix to me  . As long as you have the bearings seated against the 1mm spacers and the length of the tube is spot on, it should work great! I would verify essentially zero gap between the inner bearings races and the spacer. You don't want to have preload on the bearings when the axle is tightened. You will love having the 3.5" wheel, with a Pilot Road the overall feel is very stable and linear.

Cheers,

Dan

[ccsct203]

i may just install 1 1-mm spacer and press the 2nd bearing up against the spacer then I'll know that the bearing is up against the spacer.
I bought a extra set of bearings JIC.
the last time i loaded the bearings incorrectly was on a mini-bike many years ago.
I'll never do that again...lol
I'll be happy once this is done but then I'll be looking for the next project.
Maybe I'll install a FJR1300 FI unit on the bike....mmm

[captaudi]

I just noticed you are in Ct. We should try and hook up for a ride. My riding buddy is in Hartford, we should find some twistys in bewteen and ride them. Let me know if you are interested.

Cheers,

Dan