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+--- Thread: front sprocket nut (/showthread.php?tid=75522)
Re: front sprocket nut - Fazerider - 27-04-16
Here's some competition for the later-bikes-have-an-undersized-shaft theory:
a) the nut was underspecified
b) early Fazers had it glued on with a ridiculously strong threadlock (hence the need for a scaffolding pole extension on the socket to shift it )
c) Yamaha realised they'd made the bond too strong and switched to a different compound on later Fazers which proved to be inadequate
d) when owners/mechanics replaced the sprocket, the thread was contaminated with oil and they didn't use high-strength superglue hence subsequent failures on early bikes
e) Yamaha's instruction to dealers regarding shaft replacement relied on a measurement of the diameter of the threaded portion not because they'd made some too small, but as a means of determining whether the thread had been too badly damaged by the loose nut and/or sprocket.
Re: front sprocket nut - fazersharp - 27-04-16
(27-04-16, 04:46 PM)darrsi link Wrote: [quote author=fazersharp link=topic=19958.msg230484#msg230484 date=1461762057]Ok thank you for the info
[quote author=chrischristopherson1313 link=topic=19958.msg230482#msg230482 date=1461761379]
28k but the nut it's still there just loose a bit.
It's original nut and sprocket looks as it was changed
Just as I thought 28k and already been replaced
DARRSI. are you reading this? :pokefun (I believe it goes ) :nana
[/quote]
The sprocket may have been replaced, but still the original nut!
Hardly surprising it's done over 24K on an 18 year old bike!
[/quote]
You still don't get it do you - its not the nut its the output shaft on 99 onwards.
We are yet to find a 98 with an un touched nut that has had the nut come off on its own
Re: front sprocket nut - fazersharp - 27-04-16
(27-04-16, 05:10 PM)Fazerider link Wrote: Here's some competition for the later-bikes-have-an-undersized-shaft theory:
a) the nut was underspecified
b) early Fazers had it glued on with a ridiculously strong threadlock (hence the need for a scaffolding pole extension on the socket to shift it )
c) Yamaha realised they'd made the bond too strong and switched to a different compound on later Fazers which proved to be inadequate
d) when owners/mechanics replaced the sprocket, the thread was contaminated with oil and they didn't use high-strength superglue hence subsequent failures on early bikes
e) Yamaha's instruction to dealers regarding shaft replacement relied on a measurement of the diameter of the threaded portion not because they'd made some too small, but as a means of determining whether the thread had been too badly damaged by the loose nut and/or sprocket.
Also my pet theory is that the original 98s shaft was only produced in 1 factory and it was after 98 when production stepped up that other factory's were brought online to produce the shafts which were undersize. So all 98s are ok and thereafter its a game of chance where your shaft was made as to whether or not you have the issue because remember that not all 99 onwards have the issue. And ones yam found out they made sure the shaft spec on new bikes was correct
Re: front sprocket nut - tommyardin - 27-04-16
Now it seems we have a conflict of interest here (Or am I being thick, answers on the back of a sealed white envelope to P O Box 999 Basingstoke)were some of the shafts manufactured undersize or iare some undersize because of a loose nut chattering and wearing the apex off the top of the shaft threads.
I was born in 1947 and my Mrs reckons my shaft is undersized, and my nuts chatter as well. :eek [size=78%] [/size]
Re: front sprocket nut - chrischristopherson1313 - 27-04-16
(27-04-16, 04:46 PM)darrsi link Wrote: [quote author=fazersharp link=topic=19958.msg230484#msg230484 date=1461762057]Ok thank you for the info
[quote author=chrischristopherson1313 link=topic=19958.msg230482#msg230482 date=1461761379]
28k but the nut it's still there just loose a bit.
It's original nut and sprocket looks as it was changed
Just as I thought 28k and already been replaced
DARRSI. are you reading this? :pokefun (I believe it goes ) :nana
[/quote]
The sprocket may have been replaced, but still the original nut!
Hardly surprising it's done over 24K on an 18 year old bike!
[/quote]
IT'S definetelly old small nut (really rusty) but I can't be sure if it's original
(27-04-16, 04:46 PM)darrsi link Wrote: [quote author=fazersharp link=topic=19958.msg230484#msg230484 date=1461762057]Ok thank you for the info
[quote author=chrischristopherson1313 link=topic=19958.msg230482#msg230482 date=1461761379]
28k but the nut it's still there just loose a bit.
It's original nut and sprocket looks as it was changed
Just as I thought 28k and already been replaced
DARRSI. are you reading this? :pokefun (I believe it goes ) :nana
[/quote]
The sprocket may have been replaced, but still the original nut!
Hardly surprising it's done over 24K on an 18 year old bike!
[/quote]
Re: front sprocket nut - sinto607276 - 27-04-16
You might be interseted to know, especially fazersharp, I've eventually done my chain and sprockets on my '98 it had covered 28,400 miles and probably original chain and front sprocket not sure of back on as it looked have abused as the front one did.
Re: front sprocket nut - darrsi - 27-04-16
(27-04-16, 05:40 PM)fazersharp link Wrote: [quote author=darrsi link=topic=19958.msg230502#msg230502 date=1461772012]Ok thank you for the info
[quote author=fazersharp link=topic=19958.msg230484#msg230484 date=1461762057]
[quote author=chrischristopherson1313 link=topic=19958.msg230482#msg230482 date=1461761379]
28k but the nut it's still there just loose a bit.
It's original nut and sprocket looks as it was changed
Just as I thought 28k and already been replaced
DARRSI. are you reading this? :pokefun (I believe it goes ) :nana
[/quote]
The sprocket may have been replaced, but still the original nut!
Hardly surprising it's done over 24K on an 18 year old bike!
[/quote]
You still don't get it do you - its not the nut its the output shaft on 99 onwards.
We are yet to find a 98 with an un touched nut that has had the nut come off on its own
[/quote]
Have you tried a museum?
To have a bike 18 years and not use it is just weird.
Re: front sprocket nut - fazersharp - 27-04-16
(27-04-16, 08:47 PM)darrsi link Wrote: [quote author=fazersharp link=topic=19958.msg230504#msg230504 date=1461775224]Ok thank you for the info
[quote author=darrsi link=topic=19958.msg230502#msg230502 date=1461772012]
[quote author=fazersharp link=topic=19958.msg230484#msg230484 date=1461762057]
[quote author=chrischristopherson1313 link=topic=19958.msg230482#msg230482 date=1461761379]
28k but the nut it's still there just loose a bit.
It's original nut and sprocket looks as it was changed
Just as I thought 28k and already been replaced
DARRSI. are you reading this? :pokefun (I believe it goes ) :nana
[/quote]
The sprocket may have been replaced, but still the original nut!
Hardly surprising it's done over 24K on an 18 year old bike!
[/quote]
You still don't get it do you - its not the nut its the output shaft on 99 onwards.
We are yet to find a 98 with an un touched nut that has had the nut come off on its own
[/quote]
Have you tried a museum?
To have a bike 18 years and not use it is just weird.
[/quote]
Yes that is now becoming an issue - to find 98s still running factory chain and sprockets, but every one we do find backs up my theory.
Just like this one has
I shall remind you that twas YOU that :pokefun me
Re: front sprocket nut - darrsi - 27-04-16
(27-04-16, 09:19 PM)fazersharp link Wrote: [quote author=darrsi link=topic=19958.msg230537#msg230537 date=1461786473]Ok thank you for the info
[quote author=fazersharp link=topic=19958.msg230504#msg230504 date=1461775224]
[quote author=darrsi link=topic=19958.msg230502#msg230502 date=1461772012]
[quote author=fazersharp link=topic=19958.msg230484#msg230484 date=1461762057]
[quote author=chrischristopherson1313 link=topic=19958.msg230482#msg230482 date=1461761379]
28k but the nut it's still there just loose a bit.
It's original nut and sprocket looks as it was changed
Just as I thought 28k and already been replaced
DARRSI. are you reading this? :pokefun (I believe it goes ) :nana
[/quote]
The sprocket may have been replaced, but still the original nut!
Hardly surprising it's done over 24K on an 18 year old bike!
[/quote]
You still don't get it do you - its not the nut its the output shaft on 99 onwards.
We are yet to find a 98 with an un touched nut that has had the nut come off on its own
[/quote]
Have you tried a museum?
To have a bike 18 years and not use it is just weird.
[/quote]
Yes that is now becoming an issue - to find 98s still running factory chain and sprockets, but every one we do find backs up my theory.
Just like this one has
I shall remind you that twas YOU that :pokefun me
[/quote]
Not sure if we can accept "probably"?
Re: front sprocket nut - chrischristopherson1313 - 27-04-16
(27-04-16, 09:19 PM)fazersharp link Wrote: [quote author=darrsi link=topic=19958.msg230537#msg230537 date=1461786473]Ok thank you for the info
[quote author=fazersharp link=topic=19958.msg230504#msg230504 date=1461775224]
[quote author=darrsi link=topic=19958.msg230502#msg230502 date=1461772012]
[quote author=fazersharp link=topic=19958.msg230484#msg230484 date=1461762057]
[quote author=chrischristopherson1313 link=topic=19958.msg230482#msg230482 date=1461761379]
28k but the nut it's still there just loose a bit.
It's original nut and sprocket looks as it was changed
Just as I thought 28k and already been replaced
DARRSI. are you reading this? :pokefun (I believe it goes ) :nana
[/quote]
The sprocket may have been replaced, but still the original nut!
Hardly surprising it's done over 24K on an 18 year old bike!
[/quote]
You still don't get it do you - its not the nut its the output shaft on 99 onwards.
We are yet to find a 98 with an un touched nut that has had the nut come off on its own
[/quote]
Have you tried a museum?
To have a bike 18 years and not use it is just weird.
[/quote]
Yes that is now becoming an issue - to find 98s still running factory chain and sprockets, but every one we do find backs up my theory.
Just like this one has
I shall remind you that twas YOU that :pokefun me
[/quote]
Chain it's definetelly new.
I have bought new pair of sprocket and 12mm nut.
All coming on Friday so finger crossed I can took of that loose nut and put all as it should be.
Re: front sprocket nut - chrischristopherson1313 - 27-04-16
(27-04-16, 08:42 PM)sinto link Wrote: You might be interseted to know, especially fazersharp, I've eventually done my chain and sprockets on my '98 it had covered 28,400 miles and probably original chain and front sprocket not sure of back on as it looked have abused as the front one did.
Will do some picture tomorrow morning but I don't think it's so bad as on the picture
Re: front sprocket nut - tommyardin - 27-04-16
(27-04-16, 08:42 PM)sinto link Wrote: You might be interseted to know, especially fazersharp, I've eventually done my chain and sprockets on my '98 it had covered 28,400 miles and probably original chain and front sprocket not sure of back on as it looked have abused as the front one did.
FFS Sinto I think you were lucky that the chain had not jumped the sprocket and wiped out the clutch push rod assembly. :eek :fish
Re: front sprocket nut - sinto607276 - 27-04-16
(27-04-16, 10:31 PM)tommyardin link Wrote: FFS Sinto I think you were lucky that the chain had not jumped the sprocket and wiped out the clutch push rod assembly. :eek :fish
I know!
I kept putting it off due to one thing or another, knew it needed done but came end of last season I put it away and one thing led to another, work/family issues etc but yes, I'm extremely lucky so it's a lottery ticket at weekend me thinks
I think the original Yamaha engineers would be really pleased/interested of how long the original chain and sprocket lasted :lol
Re: front sprocket nut - chrischristopherson1313 - 29-04-16
(27-04-16, 11:39 PM)sinto link Wrote: [quote author=tommyardin link=topic=19958.msg230556#msg230556 date=1461792717]
FFS Sinto I think you were lucky that the chain had not jumped the sprocket and wiped out the clutch push rod assembly. :eek :fish
I know!
I kept putting it off due to one thing or another, knew it needed done but came end of last season I put it away and one thing led to another, wirk/family issues etc but yes, I'm extremely lucky so it's a lottery ticket at weekend me thinks
Ok so all done new sprocket and nut on place
The picture of old sprockets and that small nut attached
[img]http://[smg id=2794 type=preview align=center caption="tmp 5921 20160429 1829002038478561"][/img]
Re: front sprocket nut - chrischristopherson1313 - 29-04-16
[smg id=2798 type=preview align=center caption="tmp 5921 20160429 182907249810580"]
(29-04-16, 11:43 PM)chrischristopherson1313 link Wrote: [quote author=sinto link=topic=19958.msg230561#msg230561 date=1461796780]
[quote author=tommyardin link=topic=19958.msg230556#msg230556 date=1461792717]
FFS Sinto I think you were lucky that the chain had not jumped the sprocket and wiped out the clutch push rod assembly. :eek :fish
I know!
I kept putting it off due to one thing or another, knew it needed done but came end of last season I put it away and one thing led to another, wirk/family issues etc but yes, I'm extremely lucky so it's a lottery ticket at weekend me thinks
Ok so all done new sprocket and nut on place
The picture of old sprockets and that small nut attached
[img]http://[smg id=2794 type=preview align=center caption="tmp 5921 20160429 1829002038478561"][/img]
[/quote]
Re: front sprocket nut - chrischristopherson1313 - 30-04-16
[smg id=2800 type=preview align=center caption="tmp 5921 20160429 1829291866326807"]
(29-04-16, 11:59 PM)chrischristopherson1313 link Wrote: [smg id=2798 type=preview align=center caption="tmp 5921 20160429 182907249810580"][quote author=chrischristopherson1313 link=topic=19958.msg230803#msg230803 date=1461969837]
[quote author=sinto link=topic=19958.msg230561#msg230561 date=1461796780]
[quote author=tommyardin link=topic=19958.msg230556#msg230556 date=1461792717]
FFS Sinto I think you were lucky that the chain had not jumped the sprocket and wiped out the clutch push rod assembly. :eek :fish
I know!
I kept putting it off due to one thing or another, knew it needed done but came end of last season I put it away and one thing led to another, wirk/family issues etc but yes, I'm extremely lucky so it's a lottery ticket at weekend me thinks
Ok so all done new sprocket and nut on place
The picture of old sprockets and that small nut attached
[img]http://[smg id=2794 type=preview align=center caption="tmp 5921 20160429 1829002038478561"][/img]
[/quote]
[/quote]
Re: front sprocket nut - Val - 30-04-16
Good job that you have changed the nut :thumbup
Two questions. I see on the pictures the rear wheel is almost at the end of the stretching the chain? Not sure from the picture is that the case.
Do you have enough chain slack, it must be 30-40mm. Do you have measured your chain wear? 10 links must be no more than 150mm long. If it is more the chain has been stretched too far and needs change.
Re: front sprocket nut - chrischristopherson1313 - 30-04-16
(30-04-16, 08:53 AM)Val link Wrote: Good job that you have changed the nut :thumbup
Two questions. I see on the pictures the rear wheel is almost at the end of the stretching the chain? Not sure from the picture is that the case.
Do you have enough chain slack, it must be 30-40mm. Do you have measured your chain wear? 10 links must be no more than 150mm long. If it is more the chain has been stretched too far and needs change.
Chain slack its ok
IT'S still 2 lines to limit. It's better when I changed sprockets.
I will check that 150mm when have time.
Thanks
Re: front sprocket nut - His Dudeness - 30-04-16
Might just be the picture but do the threads on that shaft look stripped to anyone? I'd be keeping a close eye on that I think they look pretty worn
Re: front sprocket nut - darrsi - 30-04-16
(30-04-16, 01:37 PM)His Dudeness link Wrote: Might just be the picture but do the threads on that shaft look stripped to anyone? I'd be keeping a close eye on that I think they look pretty worn
What threads? :look