Date: 28-03-24  Time: 17:41 pm

Author Topic: Front Sprocket Nut  (Read 3561 times)

Skippernick

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Front Sprocket Nut
« on: 28 October 2018, 08:26:11 pm »
Its that time for new chain and sprockets, still have the originals so that includes the 9mm nut, kept an eye on it due to known problems but all was well.
Sooo ordered a new nut and locking washer from my dealer and a new 9mm nut turns up. Apparently its all up to date, but why a 9mm nut and not the 12mm nut if there are known problems.
Shall I get a 12mm nut from wemoto?


Cheers


Nick
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fazersharp

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Re: Front Sprocket Nut
« Reply #1 on: 28 October 2018, 08:28:23 pm »
Quote
Shall I get a 12mm nut from wemoto?
Yes.I am the same as you with no problems but keep an eye on it. I already have my 12mm nut brought from webmoto ready for when I change sprocket and chain. Odd they send the 9mm nut, I think you have to request the 12mm when you order otherwise you get sent the standard I think. Especially if the dealer is clueless or useless, you will get "no mate that is standard" then you have to explain the whole situ.Search on here as you will find the correct part number and they may be able to swap it for you. 
« Last Edit: 28 October 2018, 08:35:32 pm by fazersharp »
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Fazerider

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Re: Front Sprocket Nut
« Reply #2 on: 28 October 2018, 08:41:34 pm »
It seems that Yamaha don't bother to update the database for part numbers. Perhaps this was understandable in the days when dealers had to look up the details on microfiche, but these days there is no excuse. Anyway, if you want the 12mm nut (which you should) you have to tell the dealer the correct P/N.

Anquetil

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Re: Front Sprocket Nut
« Reply #3 on: 29 October 2018, 08:22:17 am »
Here is the 12mm nut. I replaced the 9mm version on both of my Fazers.

Anquetil

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Re: Front Sprocket Nut
« Reply #4 on: 29 October 2018, 01:10:46 pm »
Forgot to mention that the cost of the nut and washer is £8.49 including postage, from mz-parts-bristol on ebay.

darrsi

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Re: Front Sprocket Nut
« Reply #5 on: 29 October 2018, 10:59:58 pm »
Not seen that part number before?
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darrsi

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Re: Front Sprocket Nut
« Reply #6 on: 29 October 2018, 11:03:28 pm »
Not seen that part number before?


My bad, i recognized the first numbers, but not the second part, but after a search there's no other number.  :)


Might be the nut/washer kit part number i remember?
« Last Edit: 29 October 2018, 11:18:32 pm by darrsi »
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Anquetil

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Re: Front Sprocket Nut
« Reply #7 on: 30 October 2018, 07:00:59 am »
Here is the washer.

darrsi

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Re: Front Sprocket Nut
« Reply #8 on: 30 October 2018, 12:09:35 pm »
This is the one i was thinking of, but it would seem that they now sell the nut and washer separately rather than as a kit now.

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Re: Front Sprocket Nut
« Reply #9 on: 30 October 2018, 12:15:05 pm »
Hi all. These are the nut and washer I was supplied with when I purchased my fox eye.

Skippernick

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Re: Front Sprocket Nut
« Reply #10 on: 05 November 2018, 08:48:12 pm »
Cheers guys I put that to them next Saturday!

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limax2

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Re: Front Sprocket Nut
« Reply #11 on: 07 November 2018, 10:22:58 am »
Here is a drawing I did when this topic was fairly new. Of no practical use but interesting anyway.  ;)

His Dudeness

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Re: Front Sprocket Nut
« Reply #12 on: 07 November 2018, 06:19:50 pm »
Nice drawing ;) That must have taken some careful measuring. What program did you draw it in?

limax2

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Re: Front Sprocket Nut
« Reply #13 on: 07 November 2018, 06:46:12 pm »
Nice drawing ;) That must have taken some careful measuring. What program did you draw it in?
It was done on Autocad 2005.
It does illustrate the extra thread engagement.
Interesting that the counterbore in the new nut is 1mm deeper than the old nut. Made me wonder if with unfavourable build up of tolerances you could get a situation with the old nut where it tightened on the end of the shaft splines rather than on the sprocket. Same would happen if an aftermarket sprocket was a bit thinner than original. Maybe I overthink these things.  ;)
« Last Edit: 10 November 2018, 08:55:30 am by limax2 »

Skippernick

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Re: Front Sprocket Nut
« Reply #14 on: 25 November 2018, 11:42:18 am »
Can anyone recommend with a link a decent chain breaker/riveter tool. Want to get one that will last longer than half a job!!


Cheers
Nick
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Skippernick

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Re: Front Sprocket Nut
« Reply #15 on: 04 December 2018, 05:07:57 pm »
So I've got my upgraded nut and it is the right thickness overall, but I wasn't expecting it to be hollowed out in the middle making the thread thickness basically the same as a 9 mm nut. Is this right?
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darrsi

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Re: Front Sprocket Nut
« Reply #16 on: 05 December 2018, 06:44:21 am »
So I've got my upgraded nut and it is the right thickness overall, but I wasn't expecting it to be hollowed out in the middle making the thread thickness basically the same as a 9 mm nut. Is this right?


From memory the new nut is flush with the end of the shaft, including the threaded part.
I'm sure it's meant to have more threads otherwise it's all a bit pointless.
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Jules-C

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Re: Front Sprocket Nut
« Reply #17 on: 05 December 2018, 01:58:34 pm »
Yes it is meant to be hollowed out so the nut pushes on the sprocket and doesn't push on the end of the splines on the shaft.  The 9mm nut is also hollowed out so you get about twice the threaded length with the 12mm nut

limax2

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Re: Front Sprocket Nut
« Reply #18 on: 06 December 2018, 06:22:54 pm »
So I've got my upgraded nut and it is the right thickness overall, but I wasn't expecting it to be hollowed out in the middle making the thread thickness basically the same as a 9 mm nut. Is this right?
Look at the drawing I posted earlier in this thread. You will see the following.
The 12mm nut is hollowed out 1mm more than the 9mm nut, but when fitted this is all in the are of the undercut on the shaft thread so doesn't effect the thread engagement. On the 9mm nut the nut thread overlaps the shaft thread slightly where the shaft is undercut. 
At the outside end the 12mm nut comes to the end of the shaft whereas the 9mm stops short. so you gain about 2mm to 3mm thread engagement above the original approx. 5mm engagement.

fazersharp

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Re: Front Sprocket Nut
« Reply #19 on: 06 December 2018, 07:12:21 pm »
Here you are, I don't want to miss out on the show us your nuts thread
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Skippernick

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Re: Front Sprocket Nut
« Reply #20 on: 06 December 2018, 08:48:36 pm »
Fazersharp take the same pic but turn the nut over!
Ok, I never opened the 9mm nut packet so never realised. Thanks all.
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fazersharp

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Re: Front Sprocket Nut
« Reply #21 on: 06 December 2018, 09:08:58 pm »
Fazersharp take the same pic but turn the nut over!
Ok, I never opened the 9mm nut packet so never realised. Thanks all.
Have a search on here I think there was one posted a couple of years ago- my bikes asleep now and I don't want to wake it up otherwise it will want to go out and it looks a bit damp out there
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tommyardin

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Re: Front Sprocket Nut
« Reply #22 on: 06 December 2018, 10:56:29 pm »
Fazersharp take the same pic but turn the nut over!
Ok, I never opened the 9mm nut packet so never realised. Thanks all.
Have a search on here I think there was one posted a couple of years ago- my bikes asleep now and I don't want to wake it up otherwise it will want to go out and it looks a bit damp out there


I would love to show you my nuts.
I hope I do not get PENALISED for this. :eek

fazersharp

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Re: Front Sprocket Nut
« Reply #23 on: 06 December 2018, 11:30:32 pm »
Fazersharp take the same pic but turn the nut over!
Ok, I never opened the 9mm nut packet so never realised. Thanks all.
Have a search on here I think there was one posted a couple of years ago- my bikes asleep now and I don't want to wake it up otherwise it will want to go out and it looks a bit damp out there


I would love to show you my nuts.
I hope I do not get PENALISED for this. :eek
That is a good side by side comparison. You got a very shiny nut compared to mine - is it a genuine yam one     
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tommyardin

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Re: Front Sprocket Nut
« Reply #24 on: 06 December 2018, 11:48:17 pm »
Fazersharp take the same pic but turn the nut over!
Ok, I never opened the 9mm nut packet so never realised. Thanks all.
Have a search on here I think there was one posted a couple of years ago- my bikes asleep now and I don't want to wake it up otherwise it will want to go out and it looks a bit damp out there


I would love to show you my nuts.
I hope I do not get PENALISED for this. :eek
That is a good side by side comparison. You got a very shiny nut compared to mine - is it a genuine yam one   
Yeah came in the small poly packaging with all the Yamaha logo and info, inc part numbers, plus I purchased the new lock washer at the same time that also came in it own Yamaha packaging.
Yours was probably passed its sell by date  :lol
Same packaging as the photos above in the earlier posts
« Last Edit: 06 December 2018, 11:49:46 pm by tommyardin »