FJ600 - Broken Piece Under Chain Cover

When we removed the chain cover we found a broken plastic piece inside.

We can't figure out what it is from any of the parts explosions in the manual.

It appears that it was circular and possibly had a small spring in it

Pictures are below

TIA

M

 

The FJ600 has "inner workings" in that cover, it's not just an empty shell like on the XJ550s.

Look at the inside of the cover; and compare to the fiche: http://www.yamahapartshouse.net/oempart ... ycle/parts

Is that inner plastic piece intact?

 

the neutral switch seems to be intact.

I've been looking at the parts diagrams, Intparticular the diagram for "crankcase cover" and "Electrical 2" and I still can't figure out what the heck it is.

any other ideas?

M

 

It looks to me that the chain is hitting the plastic sleeve around the shifter shaft. Adjust the chain.

 

There is one off-hand possibility; and that's maybe it's not from behind that cover at all.

Oil seals have springs in them. Did your sprocket-carrier oil seal self destruct, and the pieces go for a ride on the chain only to get caught there?

This one?

 

I'll check that out

Thanks

M

 

That DOES look like a seal spring!

I'll check that out too

M

 

Sure enough, the grease seal is missing from the that side of the wheel!

So that begs the question, do you think I should replace the bearing as well?

 

what holds that counter shaft bearing in? looks like there's a snap ring groove without a snap ring in it

 

You should replace them all. That picture is from my "how-to" on replacing rear wheel bearings, done on my chain-driven 550 Seca: http://xjbikes.com/Forums/viewtopic/t=35134.html Have at it! I covered both the old school hammer and punch method, plus the use of bearing extractors. If you use fully sealed bearings, that seal becomes redundant; but I'd install it anyway.

Ask questions if you have any. And check that chain and sprockets; if you're not familiar with the correct way to check a sprocket for wear say so and I'll happily hook you up.

(I love getting long-distance diagoses right, BTW. 8) )