Help FZR250 Transmission bearing and other questions

Both good ideas, the local hardware suggested a press to remove it, I might be wrong, however I can see that damaging the outer race as the SH2 designation means that the inner race has been hardened only

I am going to remove the engine from the bike and see if the other spaced comes out easily, I have been meaning to do this anyway.

I did put some Inox MX5 down to see if there was something to be loosened, going to fill the cavity now, let it soak overnight and see if that helps.

There is some transmission fluid here somewhere - now to find it.

BTW I am a little hesitant to grind the spacer down just yet, the replacement is $46 and I suspect will be NLA when I pitch the question, the bearing was also listed with a price when I asked, but they came back to me saying it was NLA, so the database isn't up to date it seems

 

BTW this page lists the 156704 - I suspect it's load capacity is an order of magnitude higher with 50% more bearings per row, and it's got two of them

Not sure what the AE7 stands for yet

https://www.123bearing.eu/bearing-6-156704AE7.php

 

Other pics I've seen of that bearing show it with an inner retainer as the inner race is split, which is in the pic, basically both side of the inner slide in/out for assembly which is why there are so many balls

This page shows the inner retainer to keep the assembly together

http://rolling.hu/search/616073+SKF.php


This page has the schematic diagram

https://www.noc.ua/online-catalog-b...onopen.html?bearing=7743625e7241&title=616073


I've just tried the other engine, removed the nut and sprocket and the sleeve is just as stuck, though I don't have as much purchase with the engine still in the bike

...and I've just remembered that I've got a DC TIG power source, so I'm going to use that to heat the sleeve on the good shaft

@my67xr - I've checked and the spline is only cut about 5mm deep past the beginning of the sleeve, it's loaded with Inox MX5 overnight, then tomorrow I'll rinse it clean with metho and put some heat into it with the TIG - that way I can keep the heat localised to just the sleeve, then we'll see what comes

I am surprised that it's likely pressed on given that the bearing has a retaining ring into the engine case, unless there's some grit in there that's well and truly wedged

I do have one more trick up my sleeve before I relent and get the bearing and sleeve pressed off, assuming that actually works...

 

Hmm, ambiguous - google translate says

good afternoon, international sale only directly, freight value

So wondering if that means the freight cost is US$59.99, or total cost including freight - that's a good enough price if it's including the freight, I just wish I was up on my Portuguese to make things easier

 

Thanks, that's much appreciated, I may take you up on that offer - reason being that I'm not sure I trust the longevity of the bearing which is on the replacement transmission shaft - the engine cases are full of varnish from burnt oil, and it seems daft to not replace that bearing because replacements are nigh on impossible to locate.

The local guys at the hardware reckoned it could be pressed off, but my understanding is that if you press anything off of a shaft using the outer race, then that bearing is done, same for removing wheel bearings using the internal race - once they're out they're toast, don't put them back into service as it's just asking for trouble.

The one on my 3LN1 shaft has 55K on it, not sure it's got much life left in it either.

 

Well, there you have your answer, that is conclusively why I could not shift it with small taps of a hammer - clearly I am going to have to grind that oil seal ring down to remove as there's no way that I'm going to put it back on there.

Is the bearing an interference fit or does it slide back on relatively easily.

BTW - there are double row bearings available, for memory one goes into a Lada gearbox, BUT I don't know much of Russian quality control - hit and miss is my opinion, but they're capable of magnificent quality like any other nation

And you've clarified the conflicting bearing inner diameter numbers that I had - it's 22mm, not 20mm as some sites stated - great work thank you