Missing Rear Spacer (collar)? '78 w/mags

[Kickflippin]

The microfiche was a little unclear on whether the chain-side collar attaches to the dust boot, or is a free floating piece. if it is i have no idea how it fits because it is all SNUG.

I've adjusted and reset chain tension and alignment multiple times now, but after each ride the spacer/dust cover is askew and the wheel is slightly off alignment, even though the Axle hasn't moved and the alignment marks are still true.

Axle came with the bike with two spacers on either side; the larger dust boot deal on the chain side and a smaller spacer against the disc. Wheel has new bearings, seals and the internal spacer is intact, though it was loose on assembly. Thoughts? Thanks.

Underside

disc side. Seems solid over here:

 

[Kickflippin]

Bump. Anyone?

 

[weekendrider]

I can't tell for sure if the spacer is missing from your dust cap(L.S.) but it looks like it is.
This is a mag wheel axle with spacers and dust covers.
IF a PO has squeezed the swingarm together without the spacer you may have to spread it back out?

 

[gggGary]

The dust cap is just a push fit on the spacer, it looks like it's one piece when removed and usually stays together. My first guess is that you have not transferred the spacer that is pressed into the chain side bearing over to the new bearing. Guys miss that one all the time. The bad news is that you have ruined the new bearings. Good news is they are cheap and the spacer is available aftermarket now if you threw yours away with the old bearing.

#20 in this pic. That part is the same all years 74 up.




The aftermarket spacer @ 650- central scroll down the page to find it. No longer available from Yamaha, this shouldered collar fits in the left side
6305 bearing to reduce it to 20mm. It replaces part # 90387-20166-00
All years.

#DCEN90-38720..... $26.00

 

[gggGary]

PS the more I look at your pics and description the more certain I am that a missing bearing insert collar is your problem.

 

[5twins]

His "the internal spacer is intact, though it was loose on assembly ..." statement is the giveaway.

 

[scott s]

Is this part the same as #6 (and #20 in the above post) ?

 

[scott s]

Actually, looking now, I see that it's not. Nevermind.

 

[Kickflippin]

Took the wheel off and brought to a different shop. Chain-side bearing was not quite seated flush due to the spacer being loose. The collars were both there, but banged up enough from a PO that the center spacer didn't want to seat. The shop did some magic to snug it all up. Seems to be rolling smooth now. I think I'm going to buy any rear wheel assemblies I see in the future; the parts seem likely to become harder to find in the future. Thanks everyone.

 

[5twins]

That often thrown away left bearing insert or "collar" as Yamaha calls it can also be found in TX750 and some TX/XS500 rear wheels .....

http://www.boats.net/parts/detail/yamaha/Y-90387-20166-00.html

 

[Kickflippin]

Definitely worth squirreling a few away if I run across any extras. I wonder if a well machined 1-piece collar/spacer would be a viable part to have made?

 

[weekendrider]

650Central has them.