The two shafts in the gearbox both have a bearing at either end. Four bearings in total, but Yamaha say that only 3 are replaceable.
On the output shft (one with the sprocket on eventually), apparently the larger bearing isn't replaceable with a new one.
Is this right?
Mike
Gearbox bearings
Started by
stormy
, Nov 19 2007 10:39 pm
18 replies to this topic
#1
stormy
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Posted 19 November 2007 - 10:39 pm
RIP STORMY - killed by careless driver Oct 2009
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
#2
dandywarhol
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Posted 19 November 2007 - 10:42 pm
QUOTE(stormy @ Mon 19th Nov 2007, 10:24 PM) <{POST_SNAPBACK}>
The two shafts in the gearbox both have a bearing at either end. Four bearings in total, but Yamaha say that only 3 are replaceable.
On the output shft (one with the sprocket on eventually), apparently the larger bearing isn't replaceable with a new one.
Is this right?
Mike
On the output shft (one with the sprocket on eventually), apparently the larger bearing isn't replaceable with a new one.
Is this right?
Mike
I think you'll find it's LEFT Mike
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#3
dapleb
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Posted 20 November 2007 - 09:22 am
QUOTE(stormy @ Mon 19th Nov 2007, 10:24 PM) <{POST_SNAPBACK}>
apparently the larger bearing isn't replaceable with a new one.
Did they say why? Bearing not available? Not possible to remove/fit?
Didn't remove mine.....but if the other end is replaceable dunt see why sprocket end ain't!?
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If you want to mark your location on the Carpe map: http://www.carpe-tdm...opic.php?t=5117
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
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#4
lemonentrails
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Posted 20 November 2007 - 10:57 am
I beleive output shaft and bearing come as one part.The bearing will come off but sourcing from anywhere but Yam may be a pain, as the bearing has a locating clip groove and and a small roll pin in the outer race. 3vd models anyhow.
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#5
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Posted 20 November 2007 - 11:49 am
QUOTE(lemonentrails @ Tue 20th Nov 2007, 10:42 AM) <{POST_SNAPBACK}>
I believe output shaft and bearing come as one part.The bearing will come off but sourcing from anywhere but Yam may be a pain, as the bearing has a locating clip groove and and a small roll pin in the outer race. 3vd models anyhow.
Thats what Yamaha are telling me, i.e. it isn't available as a replacement bearing.
However, at the end of the day, it is just a shaft through a bearing. I can get the bearing from a local bearing stockist, i.e. the right size including the groove, and whilst the anti-rotation pin is desirable, its nothing that bearing loctite won't sort. The large bearing is the same size as the large bearing on the other gearbox shaft, so I don't understand why Yamaha are reluctant to sell it for this application.
Let you know how I get on.
Mike
RIP STORMY - killed by careless driver Oct 2009
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
#6
dapleb
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Posted 20 November 2007 - 12:03 pm
What bit of Yamaha are you talking to? Technical dept? Or a dealership?
"Whats up", "Piston Broke", "Yeah me too...hic"
If you want to mark your location on the Carpe map: http://www.carpe-tdm...opic.php?t=5117
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Active member of TPLQHCSRSFC and TSRMCMAS (even though a year off) and avid fan of PM not sent.
If you want to mark your location on the Carpe map: http://www.carpe-tdm...opic.php?t=5117
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Active member of TPLQHCSRSFC and TSRMCMAS (even though a year off) and avid fan of PM not sent.
#7
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Posted 20 November 2007 - 12:34 pm
QUOTE(lemonentrails @ Tue 20th Nov 2007, 10:42 AM) <{POST_SNAPBACK}>
I beleive output shaft and bearing come as one part.The bearing will come off but sourcing from anywhere but Yam may be a pain, as the bearing has a locating clip groove and and a small roll pin in the outer race. 3vd models anyhow.
Those types of bearings (groove and locating peg) are freely available, as they are used on many two-stroke crankshafts including X7, RG250, RD350LC & YPVS
#8
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Posted 20 November 2007 - 12:44 pm
Have you had a rummage through the microfiches yourself? Think there's a set in the knowledgebase, if not this site has them but alas not the relevant part numbers.
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#9
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Posted 20 November 2007 - 03:04 pm
Well, despite all the warnings from Yamaha techies, I got the whole thing separated. Lots of heat, a hydraulic press and a lickle prayer and hey presto, a pile of bits on the floor!I've sourced a new bearing, a mere £18.75. Better than Yamahas' quote of £191.00 for the shaft and gear and bearing complete.
New bearing does not have the pin, but that is not an issue, as all that does is pevent the outer race turning. Given a liberal dose of Loctite bearing adhesive, plus the circlip in the groove and the cases being clapmed together rather tightly at that point, that race is going nowhere.
That said, it would not be any hardship to drill a small blind hole in the outer case and fit a pin.
Given that this engine obviously had a hard life and then a catastrophic stop due to the bigends failing, the gearbox shows very little wear, just full of metal slivers from the shells.
Photos of a 4TX rebuild will come later if anyone is interested.
Mike
Dealership workshop, but not the one who gave me the run around with the carbs though.
New bearing does not have the pin, but that is not an issue, as all that does is pevent the outer race turning. Given a liberal dose of Loctite bearing adhesive, plus the circlip in the groove and the cases being clapmed together rather tightly at that point, that race is going nowhere.
That said, it would not be any hardship to drill a small blind hole in the outer case and fit a pin.
Given that this engine obviously had a hard life and then a catastrophic stop due to the bigends failing, the gearbox shows very little wear, just full of metal slivers from the shells.
Photos of a 4TX rebuild will come later if anyone is interested.
Mike
QUOTE(dapleb @ Tue 20th Nov 2007, 11:48 AM) <{POST_SNAPBACK}>
What bit of Yamaha are you talking to? Technical dept? Or a dealership?
Dealership workshop, but not the one who gave me the run around with the carbs though.
Edited by stormy, 20 November 2007 - 03:05 pm.
RIP STORMY - killed by careless driver Oct 2009
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
#10
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Posted 20 November 2007 - 05:41 pm
PK i wonder if that gearbox shaft thingy i bought would be of any use to Stormy ??
Edited by wicklamulla, 20 November 2007 - 05:42 pm.
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#11
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Posted 20 November 2007 - 07:33 pm
QUOTE(wicklamulla @ Tue 20th Nov 2007, 05:26 PM) <{POST_SNAPBACK}>
PK i wonder if that gearbox shaft thingy i bought would be of any use to Stormy ??
Did it come with bearings (see pic)? Its the wrong shaft....but loike the man says...the big bearings are the same.
"Whats up", "Piston Broke", "Yeah me too...hic"
If you want to mark your location on the Carpe map: http://www.carpe-tdm...opic.php?t=5117
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Active member of TPLQHCSRSFC and TSRMCMAS (even though a year off) and avid fan of PM not sent.
If you want to mark your location on the Carpe map: http://www.carpe-tdm...opic.php?t=5117
Doin valve clearances? Use dappers valve shim exchange program and the job will be carroty - Free (other than you postin me yer shims) for sporting members.
Active member of TPLQHCSRSFC and TSRMCMAS (even though a year off) and avid fan of PM not sent.
#12
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Posted 20 November 2007 - 11:14 pm
QUOTE(stormy @ Tue 20th Nov 2007, 02:49 PM) <{POST_SNAPBACK}>
That said, it would not be any hardship to drill a small blind hole in the outer case and fit a pin.
You might find drilling into the outer race of a bearing a little harder than you think
(unless of course you have access to some very tough drills 
)>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
I have a Ghost S and i'm not afraid to use it !
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"So you just ride somewhere, eat cake and then ride back".
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#13
stormy
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Posted 20 November 2007 - 11:35 pm
QUOTE(Hartside Man @ Tue 20th Nov 2007, 10:59 PM) <{POST_SNAPBACK}>
You might find drilling into the outer race of a bearing a little harder than you think (unless of course you have access to some very tough drills )
(unless of course you have access to some very tough drills )I have!
let you know how I get on.
RIP STORMY - killed by careless driver Oct 2009
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
#14
stormy
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Posted 26 November 2007 - 07:46 pm
QUOTE(stormy @ Tue 20th Nov 2007, 11:20 PM) <{POST_SNAPBACK}>
I have!
let you know how I get on.
let you know how I get on.
sorted!
RIP STORMY - killed by careless driver Oct 2009
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
#15
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Posted 26 November 2007 - 10:33 pm
QUOTE(stormy @ Mon 26th Nov 2007, 07:31 PM) <{POST_SNAPBACK}>
sorted!
Excellent
so you didn't need a spark eroder or cobalt milling bits then
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
I have a Ghost S and i'm not afraid to use it !
A Beast in Orange Called KaTie eM
"Four wheels move the body. Two wheels move the soul".
"So you just ride somewhere, eat cake and then ride back".
"Normal people believe that if it ain't broken, don't fix it. Engineers believe that if it ain't broken, it doesn't have enough features yet."
" I We're Ridin so Fast , I we're sucking Rabbits from the Hedges " {Guy Martin}
#16
stormy
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Posted 27 November 2007 - 06:10 pm
QUOTE(Hartside Man @ Mon 26th Nov 2007, 10:18 PM) <{POST_SNAPBACK}>
Excellent
so you didn't need a spark eroder or cobalt milling bits then
so you didn't need a spark eroder or cobalt milling bits then
cobalt tipped drill and a lot of cooling oil and a well setup pillar drill.
and patience.
RIP STORMY - killed by careless driver Oct 2009
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
#17
Hartside Man
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Posted 27 November 2007 - 08:06 pm
QUOTE(stormy @ Tue 27th Nov 2007, 05:55 PM) <{POST_SNAPBACK}>
cobalt tipped drill and a lot of cooling oil and a well setup pillar drill.
and patience.
and patience.
indeed I bet
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
I have a Ghost S and i'm not afraid to use it !
A Beast in Orange Called KaTie eM
"Four wheels move the body. Two wheels move the soul".
"So you just ride somewhere, eat cake and then ride back".
"Normal people believe that if it ain't broken, don't fix it. Engineers believe that if it ain't broken, it doesn't have enough features yet."
" I We're Ridin so Fast , I we're sucking Rabbits from the Hedges " {Guy Martin}
#19
stormy
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Posted 29 November 2007 - 01:01 pm
QUOTE(E.T. @ Wed 28th Nov 2007, 12:49 PM) <{POST_SNAPBACK}>
boring I bet
ho ho ho......
but thats what I meant about a well setup drill. Set it up, start it up, set to auto depth, walk away.
come back 30 mins later, job done.
RIP STORMY - killed by careless driver Oct 2009
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
currently owned ....
1996 YAMAHA TRX850 gone away for little holiday with Andrea
1997 YAMAHA TDM850 which are obviously an acquired taste. I fink I'm starting to get it now.....
1998 DUCATI 748 ... one way of keeping an old man broke.
1999 YAMAHA Thunderace there is STILL no finer motorcycle
2008 SUZUKI Bandit 1250SA ...... fecked by yours truly, but ......... still fitted with the worlds most uncomfortable bike seat. ouch!
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