Help FZR250 Transmission bearing and other questions

Hi Guys,

looking for the output shaft transmission bearing, managed to do a walk in & walk out at the local bearing place for the other three bearings - part numbers 8, 10 & 30 were easy

http://www.firstclassmotorcycles.co...yamaha/1998/fzx25-zeal/transmission#ficheZone

Part 23 isn't so simple - It's a Koyo bearing - 83B139SH2 - http://www.firstclassmotorcycles.com.au/part/yamaha/9330620217#top
Yamaha Part 93306-20217
This page has other potential candidates, https://all-bearings.com.ua/index.php?route=product/product&product_id=5771&tag=SKF:+616073

although I'm not sure about the SKF bearing and the other alternative, 156704 as some pages list them as dual row

The guy at Shep City Bearings said he could probably source one in a month or so, which right now isn't looking so bad considering that I'm not getting worthwhile hits on google.

Has anyone else managed to source one of these, it does come up as available via Yamaha dealers and I've tried the other places, partzilla etc

Just not fond of getting gouged for one bearing, considering that I managed the other three bearings for less than the price of one OEM oil seal

On a related note, the oil seal from this page, part 2 seems to have two variants, one normal and one with a secondary external lip on the inside edge which I wasn't able to source

http://www.firstclassmotorcycles.co...a/1998/fzx25-zeal/crankshaft-piston#ficheZone

Has anyone done an engine with the normal seal, because I'll opt for one of those if that's a viable option.

 

I did notice some variances in the actual uses of some "equivalents"; dual row deep groove for a Lada transmission, others are for wheel bearings, which I assume are angular contact cylindrical bearings, so not at all suitable.

Proper specs pages on actual bearing manufacturers site are non-existent thus far, so I haven't seen any with tolerance differences and most hits are for generic pages on Chinese sites

Curiously, this page has detailed specs, up to and including the clearance in the part number, however the internal bore dimensions are different 22mm (wrong?), and I haven't managed to remove the sleeve which goes beside the front sprocket yet to actually verify in I.D.

http://www.automotivebearing-xr.com/displayproduct.html?id=2848450606171520

FWIW all of the other bearings have retaining grooves and they were at a standard location for easy substitution as the guy at the bearing shop asked first thing, what is it out of as some motorcycle bearing have that retaining groove at non-standard locations.
Before going in I actually thought that a retaining groove would be a difficult ask, which wasn't the case at all.

PITA to have to shovel out 5X the price for a bearing, and that's assuming that it doesn't take a month to be delivered anyway, if it's actually available at all from Yamaha...

 

Well Yamaha dealer came back to me and said the part is NLA

So I either find another source or leave the original in there and replace the other three

@Linkin @GreyImport @Joker or anyone else that's had a few of these apart - I cannot seem to budge the sleeve which goes inside the sprocket on the countershaft - has anyone else encountered this issue?

 

Well spotted, however that's one of the sites which lists different i.d. dimensions and I haven't yet managed to remove the sleeve off of the shaft to check the internal dimensions

 

I've already contacted that site, waiting to hear back

I cannot remove the sleeve on the shaft so I'm disinclined to use any force at the moment as I don't want to damage the bearing in case it needs to go back in to service

 

The sleeve that goes onto the countershaft doesn't seem to want to budge, I've put vice grips on the sleeve and given the end of the shaft a tap with a rubber mallet - no luck

Going to try a decent amount of heat next

I just wasn't expecting it to be as stuck as it seems to be and I don't want to support the bearing and start hitting it with some force just yet as I don't have a replacement for the bearing as yet

 

Not yet, although it's looking increasingly inevitable

 

AAH, that's a good tip, I tried heating with the small flame of a butane soldering iron, not enough juice to get it hot enough and I'd forgotten that I have a heat gun

 

That is the replacement shaft.

The other one was kaput because nut came loose, the the sprocket slipped off of the shaft and mangled the threads so the nut was welded back in place and following that the sprocket slowly mangled the splines till the whole thing stopped spinning.

I was hoping to replace all of the bearings when I put the whole shebang back together, but until I can remove the sleeve I cannot actually replace the bearing, it I can find a replacement...