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 Countershaft sprocket nut

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Tonymorr




PostSubject: Countershaft sprocket nut   Fri May 07, 2010 2:39 pm

Hello all;

After a few changes of the countershaft sprocket my nut has about had it. I see that the F model uses a tabbed lock washer behind a standard nut 90179-18001-00 . I wonder why the R uses the "dented collar" style locknut 90179-18010-00?

Has anyone found a non-Yamaha nut that will work?
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YZEtc

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PostSubject: Re: Countershaft sprocket nut   Fri May 07, 2010 10:37 pm

I believe they're using the nut they're using on the WR-250R because, once the nut is staked in place, it's a more secure way of locking it in place.

A WR-250F does use a locking tab that gets bent over the flat of the nut, but you need to have the shaft splines sticking out past the sprocket a couple milimeters for the locking tab to engage with.
I don't remember the WR-250R having that design feature, especially since the back side of the WR-250R nut is flat, while the back side of the WR-250F nut is specially relieved to clear those couple milimeters of spline sticking out past the sprocket.
Also, you need a new locking tab each time because they're not meant to be reused.

You're also supposed to use a new nut each time you remove it on the WR-250R, by the way.

To sum it up, don't reinvent the Yamaha wheel and just go buy a new nut made for the WR-250R. :)
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Captain Midnight

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PostSubject: Re: Countershaft sprocket nut   Thu May 27, 2010 3:03 am

So if I change spockets twice on every ride to my ORV park, how many nuts do I need for one year of riding? 40?
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YZEtc

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PostSubject: Re: Countershaft sprocket nut   Thu May 27, 2010 6:48 am

You might.

The thing is, the part of the nut that gets staked down into the shaft cutout gets tweaked from staking it down and then bending that part back up when you need to remove the nut.
Odds are, that same part is going to line up with the cutouts in the shaft if you want to reuse the same nut, and that part won't be as strong as it was when new.
This is why the Service Manual says to use a new one - so it won't loosen and come off when riding the bike.

I guess it's ultimately up to you.

At least they're cheap. :)
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Captain Midnight

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PostSubject: Re: Countershaft sprocket nut   Thu May 27, 2010 12:46 pm

Well, I guess if it's up to me then, I'm going to engineer a differant way to lock it, so it is quick to remove and replace. I'll keep you posted.
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Captain Midnight

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PostSubject: Re: Countershaft sprocket nut   Tue Jun 01, 2010 3:43 am

I'm going to drill the nut for tie-wire.


Last edited by Captain Midnight on Sat Jun 12, 2010 2:37 am; edited 1 time in total
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granite4brains

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PostSubject: Re: Countershaft sprocket nut   Sat Jun 12, 2010 12:50 am

Wrote this on another thread too, but what's the best way to stake down that nut once you have it back on? Is there a specialized tool?
Thanks!

Also, are other people taking off their chain when they swap out the front sprocket? What a pain in the ass that was with the chain on. Just not much room in there
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Captain Midnight

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PostSubject: Re: Countershaft sprocket nut   Sat Jun 12, 2010 2:38 am

The tie wire worked fine.
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motokid
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PostSubject: Re: Countershaft sprocket nut   Sat Jun 12, 2010 8:00 am

granite4brains wrote:
Wrote this on another thread too, but what's the best way to stake down that nut once you have it back on? Is there a specialized tool?
Thanks!

Also, are other people taking off their chain when they swap out the front sprocket? What a pain in the ass that was with the chain on. Just not much room in there

Did you loosen the rear axle and slide the entire rear wheel assembly as far forward as possible?

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granite4brains

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PostSubject: Re: Countershaft sprocket nut   Sat Jun 12, 2010 2:08 pm

I ended up finding something that was the perfect size of the indentation on the shaft. Just used that with a hammer and it staked the nut perfectly. Still seems sort of quirky though especially compared to my buddy's bike which had what I think he called a snap ring?
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briansussex




PostSubject: Re: Countershaft sprocket nut   Sun Jan 27, 2013 9:32 am

Captain Midnight wrote:
The tie wire worked fine.

Any chance of a pic of how you did it please? Did you drill through both nut and sprocket?

Can't quite see how it works - sorry scratch

Brian
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mcdoudlehopper

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PostSubject: Re: Countershaft sprocket nut   Sun Jan 27, 2013 10:53 am

needpics needpics lurk
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IAmABug




PostSubject: Re: Countershaft sprocket nut   Sun Jan 27, 2013 3:01 pm

I don't stake the nut at all. I put a little locktite(blue) and make sure to torque it right. 8000kms and not a hiccup.
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mototifosi




PostSubject: Torque and a question...   Thu Feb 21, 2013 5:14 am

IAmABug wrote:
I don't stake the nut at all. I put a little locktite(blue) and make sure to torque it right. 8000kms and not a hiccup.

What is the correct torque for that nut?

Also, my bike has 4k miles and the counter sprocket seems fine. Any problem using it with a new chain and rear sprocket ? I'm chainging (spellpun) these out as I am going larger in the rear (does this 48T make my ass look fast?) and need 112 links.

Question: I see the stock rear sprocket has some extra thickness of material below the teeth that the chain seems to ride on. Normal sprockets don't. I have seen on this site, pictures of folks peeling that shyte off as evidently it can make the chain skip? If I go with a new TAG in the rear will the front stocker (13) do this "skipping" thing as it looks to have extra thickness as well?
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Biglake




PostSubject: Re: Countershaft sprocket nut   Fri Feb 22, 2013 6:42 pm

I bet your front sprocket is worn a bit its really hard to see the wear unless you have a new one to compare it to. They only cost about 15 bucks dont put a new chain on the worn sprocket, it wears the chain fast.

Not sure how much torque, I just tighten stuff like that to 30-40 ft/lbs.

I'd just stake the nut down, you can do this a bunch of times before the nut wears out. The nut is the same as the nut on the end of car axles, no one ever buys new nuts for those, or even thinks about em lol.
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mcdoudlehopper

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PostSubject: Re: Countershaft sprocket nut   Fri Feb 22, 2013 10:38 pm

torque spec for the front is 90 Ft LBS.
Would link you the service manual but Moderators asked not to because of copy issues.
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mototifosi




PostSubject: My nut...   Sat Feb 23, 2013 3:18 am

Thanks guys!

Appreciate the input.
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BCRider




PostSubject: Re: Countershaft sprocket nut   Sat Jan 16, 2016 1:26 am

Waking up an old thread..

How're you guys removing the lock ring? Do I need to get in there with a fine tip and try to bend the metal outwards? Or hammer a screwdriver in the middle?

Thanks scratch
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Biglake




PostSubject: Re: Countershaft sprocket nut   Sat Jan 16, 2016 11:12 am

I drive a small flat blade screw driver that's about the same size as the slot in the shaft straight into it or like you say hammer a screw driver in the middle. thumb

I've been through a 4-5 sprockets now and will be getting a new counter shaft nut next time as the lock ring is getting weak.
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BCRider




PostSubject: Re: Countershaft sprocket nut   Sun Jan 17, 2016 1:08 am

Thanks Biglake, that worked just right, new sprocket on and torqued cheers
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