Rebuild Finished -- Finally!

[TopCatGr58]

Hey Scott,

It may be too late, you may already have it put together, but there was a Yamaha bulletin about that bolt and washer combination. I remember seeing it in the tech bulletins or addendums on the Yamaha Fiche site. I think GNEPIG or such also posted a thread about this, can't remember it right now, but I'll try a search and see what I can find!?

I don't remember needing to use locktite for that one, but the washer had a funny shoulder that needed to be positioned exactly right to get it to tighten up properly.
T.C.

[TopCatGr58]

Hey Scott,

Sorry to be an alarmist! The tech bulletin is the last one on the 81SH listing, but it's in regards to the INNER washer between the bearing and the engine case, not the external washer and bolt! Darn CRS!
T.C.

[GARTHXS]

excellent

I am glad it was an easy fix and not something too bad

[bikerphil]

Glad it was somthing simple. Threadlock blue ALWAYS on that bolt. That what I've always done. I'm not sure if the manual(s) reccomend this.

[DGXSER]

Very glad to hear it was something that (relatively) easy!! For all the torture and heart attack that caused you I am sure, I think I would weld the little s$%t in place!

[3Phase]

Hey Scott,

Sorry to be an alarmist! The tech bulletin is the last one on the 81SH listing, but it's in regards to the INNER washer between the bearing and the engine case, not the external washer and bolt! Darn CRS!
T.C.

Thanks for the note! I did read the tech bulletin and I'm going to re-read it because I may have misunderstood it and misapplied the fix.

I don't see a washer between that bolt and the bearing in any of the parts diagrams. I know it was under that bolt because it dropped onto my hand when I removed the bolt when I split the cases the first time but it's possible it was put together wrong by someone else.

I put the whole thing together in my lap -- squeeky clean and I shimmed 1st gear and the Middle Drive Gear to tighten it up. It all looks right, feels right, shifts right and all of the gears line up perfectly but I'll check again tomorrow while the engine is out of the frame. It's a lot easier than flipping the bike upside down or laying under it getting oil in your eyes.

There has to be a reason that bolt came loose after only 60 miles.


Regards,

Scott

[TopCatGr58]

Scott,

That bulletin was only for the later model SH/LH/H engines, because they used a narrower bearing, and so a thicker washer was needed to shim it in place properly. Your bike is the 80, and so I don't think it applies to it!

There is a funny little lip on that external washer for that bolt, and if you're not careful putting it together, then it won't sit flush and that can lead to premature loosening! The blue thread lock is a good idea though!
T.C.

[3Phase]

Scott,

That bulletin was only for the later model SH/LH/H engines, because they used a narrower bearing, and so a thicker washer was needed to shim it in place properly. Your bike is the 80, and so I don't think it applies to it!

Yes, which is why I was more than a little disturbed when I looked at the part diagram and discovered that the 1980 isn't supposed to have a washer but, of course, mine does.

Seriously, thank you for mentioning that tech bulletin. It's fixed, literally. The bike runs great; sounds even better than before if that's possible and I'll keep my ears tuned for that noise starting up again.

XS shift now like buttered Russian tractor.

There is a funny little lip on that external washer for that bolt, and if you're not careful putting it together, then it won't sit flush and that can lead to premature loosening! The blue thread lock is a good idea though!
T.C.

I didn't see a lip on it but I could have missed it. I'm not even supposed to have a washer. It's a precision-ground, hardened, washer that fits over the transmission 'drive axle' end. It rides on the inner bearing race and the bolt pulls the axle through the bearing and flush with the top of the washer.

Everything on the drive axle must be shimmed correctly or the gear stack will be too loose, too tight or misaligned. It's possible the stack was too tight or stuck when I torqued the bolt and loosened up a red hair as I rode. Tension on the bolt would drop like a stone and allow the bolt to loosen and the washer to play HulaHoop.

I plan on riding some more tomorrow but now it's time to get something to eat, kick back and relax!


Regards,

Scott

[3Phase]

Glad it was somthing simple. Threadlock blue ALWAYS on that bolt. That what I've always done. I'm not sure if the manual(s) reccomend this.

The manual just gives the torque spec: 7.0 m-kg (51 ft lbs).

There are a couple of other bolts that I Locktighted that aren't mentioned in the manual, but I can't remember them off the top of my head.

Very glad to hear it was something that (relatively) easy!! For all the torture and heart attack that caused you I am sure, I think I would weld the little s$%t in place!

You have no idea... ice-cold shock rushing through the veins and down the spine after hearing and confirming the noise was the least of it. Fortunately, I don't panic easily and I'm both persistent and stubborn so now I have a bike to ride again.


Regards,

Scott