Wheel Bearing Issues
 

Hello all,
I just picked up a new pair of Michelin Pilot Power tires for my 1991 f2 this weekend. I read some threads about proper techniques for removing the wheels and wheel bearings, but I'm not sure if I carried out the task correctly, as it was my first time. The rear wheel came off really easy after my hugger, chain guard, chain, and all relevant bolts were removed. I don't think there is any damage to the rear wheel bearing, although I think it may be safe to replace it anyways. Here are some pictures of the rear wheel bearings.
https://cbrforum.com/forum/members/q...ring-17149.jpg
https://cbrforum.com/forum/members/q...ring-17147.jpg
Also I am wondering If I should replace the rear sprocket.
https://cbrforum.com/forum/members/q...cket-17151.jpg
https://cbrforum.com/forum/members/q...cket-17148.jpg
I am VERY new to the mechanical aspect of motorcycle repair, so hopefully someone can help me out with the few questions I have.

I proceeded to remove the front wheel, following the steps on a thread in the general tech forum, however it was difficult to remove the axle. I tapped it out using a rubber hammer. There was also an attachment on the left side of the front wheel, that attached right onto the axle. It had a hose attached to it, so perhaps this is some sort of cooling device for the front wheel housing (if thats the correct term). The right side of the front wheel had a seal which I pulled out (I did this carefully making sure not to damage the seat) because it didn't look like it was intact. Infact, the ball bearings were loose and it seemed like some were missing. Perhaps the seal was broken. Here are some pictures of the front wheel bearing housing, and the parts I pulled out.

Front left:
https://cbrforum.com/forum/members/q...ring-17137.jpg
Front right:
https://cbrforum.com/forum/members/q...sing-17140.jpg
Front right:
https://cbrforum.com/forum/members/q...sing-17141.jpg
Parts that came out of the right side of the front wheel:
https://cbrforum.com/forum/members/q...seal-17142.jpg
https://cbrforum.com/forum/members/q...seal-17143.jpg
https://cbrforum.com/forum/members/q...seal-17144.jpg
https://cbrforum.com/forum/members/q...axle-17145.jpg

Basically, I know I have to replace the front wheel bearing. However, the way the parts came out, it doesn't seem like the bearing configuration on the front wheel is symmetric. I mean that the bearings on the front right don't seem to be the same as the ones on the front left. I am worried that the front wheel might need replacing..does it look like this is the case or will a simple replacement bearing do the trick? I am probably asking alot of stupid questions here, and I apologize! That being said, I know all you guys/girls are incredibly knowledgeable and hopefully someone can help steer me in the right direction.

I looked at allballsracing.com, but didn't feel like paying $66 for shipping before I knew exactly what needed to be purchased. I'm going to my local shop on tuesday to ask some questions and see if they have some of the specific parts I'm looking for.

In addition, I definitely WON'T be putting the tires on myself, as I have no idea nor the equipment to balance the tires. I will gladly leave this to the pro's.

Lastly, I'm not sure if you can tell from the pictures, but it seems like the upper sidewall of the wheels are very minutely bent, perhaps from the PO's using a tire iron incorrectly..again I'm not sure, but it caught my attention so I figured I'd mention it here.

Front:
https://cbrforum.com/forum/members/q...heel-17139.jpg
https://cbrforum.com/forum/members/q...heel-17138.jpg
Rear:
https://cbrforum.com/forum/members/q...heel-17146.jpg

Sorry for the poor picture quality, they were taken on my iphone. If other pictures are needed to aid the diagnosis, let me know and I will try to get different angles.

Thanks for looking!
Cheers

The hub with the cable is the speedometer sensor, I believe.

Yes, new bearings are in order. Haven't cross-checked, but $66, sounds surprisingly high,for
allballsracing. They have been my go-to source for all my bearings in the past, though.They usually
sell as kits, for the specific application, based on make/model/year. So if you need two different ones
for left/right, it should be shipped that way.

The rim does look bent, whether it's enough to be a safety/mechanical issue, is hard to call.
Is that just an illusion of wheel rim tape?

Thanks for clearing up the speedometer cable question. As for allballsracing.com, the only reason it's $66 for shipping is because I'm not located in the US. The part is only $17 I believe. If I can order the bearings through a local shop it might be cheaper, so I will look into that on Tuesday. I'm unsure about the wheels, but I'll have the guys at the shop take a look at them. The rim tape was applied by the PO and he didn't do a very good job with the overlap and non-circular path.

Should the rear sprocket be replaced? If so, which brand would you recommend?

It's hard to tell from the pics, whether the sprocket is worn or not. Are the teeth
symetrical? If they have a lean, then they are getting worn and will need to be
replaced. If you replace any of the drive-train, replace all of it. i.e. both sprockets
and the chain as a set. Post a closer look, straight down on the sprocket.
Like your second pic, but close enough to discern the teeth.

Hope this helps, Ern

Thanks for your help! The teeth seem to be unsymmetrical, but it's hard to tell whether they all are. I think I should replace it regardless, along with the front sprocket and chain as well. I didn't know chains were $180! I'm going to see if I can get a better deal on ebay. Here are some pics of the rear a bit closer up.

https://cbrforum.com/forum/members/q...cket-17183.jpg

https://cbrforum.com/forum/members/q...cket-17184.jpg

https://cbrforum.com/forum/members/q...cket-17185.jpg

Thanks!

Yeah - that sprocket is done. If it is that bad, the front is just as bad, and the chain is too. All 3 need to be replaced.

For the front bearings - yes something is fubar with the bearings you pulled out, and the roller bearing being in there is puzzling. Replace em all.

For strength and longevity, go with steel sprockets in the 530 size. 530 stuff is usually a little cheaper too. If you think a few ounces of weight savings is important, you can get Aluminum sprockets and/or 520 size.

I just checked - you can get steel 530 front and rear sprockets, and a lower-priced o-ring 530 chain in the $170 range before shipping @ somewhere like Dennis Kirk.

Yuppers, time for replacement. See how the teeth are squashed at the tips?
That raised metal ridge? That should be a slight bevel, to the edge of the tooth.

When you get your new set/kit, take a look and compare the two. That will give you a better idea, of what wear looks like and how it affects the teeth.

So I'm going to replace the full drivetrain as you both have instructed. Definitely stoked to get some nice new machined parts, as well as cleaning the swingarm, forks, and surrounding areas.

I see what you guys are saying now, with the teeth. Almost looks like a wave. I ended up going with JT steel sprockets, in the 530 size, as well as a DID chain. Went with 43 in the rear and 15 in the front, which is 2.87 gearing. I think that's stock. Also ordered bearings at my local shop from allballsracing.com. Can't wait to get all these parts on, all polished and everything. I'll post a pic when she's got her new tread on too. Thanks for the help.

Cheers!