Terminal Cush Drive (and rear sprocket)
 

Hi everyone, I'm posting this in 'General' as I hope to reach as many XT660 owners as possible...

As you know, I'm currently in the USA on my XT660Z, and it turns out model specific parts are impossible to get via Yamaha USA (duh) so...

I was wondering if anyone knows if the cush driver rubbers from the XTZ (and XTR/XTX presumably have the same rear hub?) are used in any other Yamaha model - if it's also a US model then I'll be able to order them for that model instead...

Also, does anyone know the PCD (pitch circle diameter) of the rear sprocket bolts? I know the Diversion sprocket (520 version) will fit and have the Renthal part number, but that will have to be ordered too...

I was hoping that the PCD might be the same as another road or dirt bike and I can just use one of those instead?

Any help, greatfully... etc etc

Jenny xx

Jenny I have checked both the XTX/XTR Parts Manual and the XTZ Tenere and found that the part number for the cush drive rubbers is exactly the same on all 3 bikes.

The part number is in facts 5Y1-25364-00 DAMPER
Now I am sure that the hub that these rubbers fits in is the same on all 3 bikes and that there is no other Yamaha model that uses this hub, for example if you look at a Fazer 600 you'll see they have a complete different setup compared to the XT wheels hubs & rimsets which are spoked.

A full set of cush drive rubbers would cost about �18 ex vat. But if you read the thread below you will find some tips from Kev on alternative methods to regenerate / refurb the existing rubbers with either strips of converyor belt or inner tubes, see what you think.

http://www.xt660.com/showthread.php?t=4042&highlight=cush+drive

Unless there are completey done (ie falling to bits) just do the kev idea which many people (me including) have done, basically find some inner tubing or other type of rubber and jam it in the space for the rubber cush drives. You may need to glue it in place to stop it moving out of place once you push the sprocket back on.

Many thanks guys - I knew I could rely on you!

Yes, I'd considered bodging the the rubbers using some inner tube/rubber mat and siliconing the lot in there for now...

I'll order up the new parts when I get back - thanks for confirming they are model (range) specific, I had a feeling that would be the case...

Any joy with the PCD on the rear sprocket? - does anyone have a spare they could measure perhaps?

I can order a Renthal Divvy one here, but it will take a few days and I'm on the road, so hoping to find something in stock...

Thanks again guys!

xxx

can't help on the PCD, I haven't got a bike to check.

Jenny,

Just measured my rear sprocket and I make the diameter (hole centres) 145mm.

Hope that helps.



Nick.

Many thanks Nick - that is certainly something to go on now, hopefully I'll be able to match it up with something...

I've found an independent bike shop (the sort that will let you change your oil yourself!) which is on the notorious hwy 129 south of Deal's Gap (Google it x) which I'll happen to be passing in the next day or two... I called him today and he has the cush drive bearing in stock (yea!), so with a bit of bodging of the rubbers as suggested above, I reckon I'll be able to get the rear end ship shape again...

I'm going to need a new chain too as the wobble has really stretched it - it's making a horrible noise on the overrun now... grrrr...

Anyway, fingers crossed, and thanks again!

Jenny xx

JT Sprocket dimensions for XTR are here:-
http://www.jtsprockets.com/52.0.html...sel_uid=2402&p=
And from Renthal (Euro) site, the part numbers are the same for the XTR/X/Z as 219U-520-45P-HA
And doing a bit of cross-referencing I think a JT Sprockets number JTR 855.45 should fit the Tenere.
http://www.jtsprockets.com/61.0.html?&L=0
Contact JT USA:-
http://www.jtsprockets.com/41.0.html
Best of luck.

Timpo.

Hi Timpo - that is exactly what I was looking for, thank you!

I actually have the JT sprocket on the rear already (in the sorry shape it is), so it definitely fits!

Now I just hope something else is the same size!

Jenny xx

Yamaha XJ600 S/SC- D/E/F/G/H/J/K Seca II USA. 48 tooth

Yamaha XJ600 S-L,M Diversion 4DG. 46 tooth

Yamaha MT-03 5YK. 47 tooth

JT USA are listing 45, 46, 47, 48 tooth options on the JTR 855 pattern so any size should be able to be sent via overnight freight (eg, Fedex) to you asap.
Failing that, a race bike shop should be able to machine out a 5/8 x 1/4 plate chainwheel and drill holes on a 145pcd to fit your sprocket carrier, a little expensive though, but you could try a big smile........:Christo_pull_hair:, whoops, I meant.....:icon_biggrin:.

Timpo.

Just changed mine
 

Probably not alot of help now, but if I'd seen this on Friday I could have helped. Anyway, mine were well shot, but not just worn and crushed, the rubber turned to a big black sticky marshmallow (not the Dairylea JMo promissed!), took a bl00d age to get all the crap out, and there's no way Kev's mod would have worked - Your's might be different, I may have had some iffy rubber to start, but once apart, what was left was just a sticky mess - not even sure if I could have re-assembled it.

All sorted now, just waiting for the force 8 to die down, and the hail, and the snow then maybe I'll get here out for a test ride (just to be sure :toothy5:)

Timpo, you're a star... (I was trawling their online catalogue last night too - excellent resource!) - looks like the XJ600 one is the one to order, the only problem is it's at least a 10 year old bike (and never that popular here), so it may not be a stock item in the US warehouse... I'll ask the question first thing tomorrow though...

Alternatively, the closest I could find is a DRZ400 sprocket - it's 1mm different (typical huh?) and would need the bolt holes drilling out to 10.5mm - but with a bit of jiggle I reckon it would fit as a temporary measure - just as long as you centre it really well, or else the chain will suffer again...

xxx

I have my uses......:smilies0948:

Yummy! And that's one of them...... merci beaucoup!

Timpo.

Just a quick update...

I've managed to order a JT rear sprocket plus a rear TKC80 tyre, both on overnight delivery - yea!

They only had a 47T sprocket available (and only three of those in the whole USA!), but that's fine as I wanted to gear down a little anyway, and certainly need a new chain too... cush bearing is on the shelf, so we ought to be back together tomorrow afternoon... phew!

So, in the meantime, since the sun is blazing it is a balmy 80 degrees here in North Carolina, I've been riding a few of the local roads... there is one called Hwy 129 which is rather fun (Google Deal's Gap) - believe me, it is every bit as good as the hype! There are plenty more spectacular roads in the region too - Hwy 28 is another corker, as is the Foothills Parkway and Cherohala Skyway - all awesome fun, no traffic and breathtaking views! - just a shame my tyres are so square after those 3000 miles in Florida!

xxx