mkI has no shoulder. http://www.carpe-tdm...?showtopic=4421 , see GG's post and click linky dink.
Loose gearbox Sprockets
Started by
Guest_GuyGraham_*
, Nov 20 2007 07:47 pm
27 replies to this topic
#21
dapleb
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Posted 22 November 2007 - 10:30 pm
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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.
Active member of TPLQHCSRSFC and TSRMCMAS (even though a year off) and avid fan of PM not sent.
#22
tdm850rider
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Posted 22 November 2007 - 10:32 pm
Just a thought... could the 'reverse torque' from downshifting (to slow the bike) contribute to sprocket loosening?
Seems a possibility. What do you think?
Seems a possibility. What do you think?
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#23
stormy
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Posted 22 November 2007 - 10:39 pm
QUOTE(tdm850rider @ Thu 22nd Nov 2007, 10:17 PM) <{POST_SNAPBACK}>
Just a thought... could the 'reverse torque' from downshifting (to slow the bike) contribute to sprocket loosening?
Seems a possibility. What do you think?
Seems a possibility. What do you think?
only if you are drowning and looking for a straw!
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!
#24
lemonentrails
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Posted 22 November 2007 - 11:18 pm
QUOTE(tdm850rider @ Thu 22nd Nov 2007, 10:17 PM) <{POST_SNAPBACK}>
Just a thought... could the 'reverse torque' from downshifting (to slow the bike) contribute to sprocket loosening?
Seems a possibility. What do you think?
Seems a possibility. What do you think?
a very good point and quite likely...
as for the tab washer ,its there as much to stop the nut coming all the way off as it is to stop the nut loosening, they do allow the nut to slacken in my experience,.Thats why i always use loctite.
Having looked at a new shaft closely I think the 2nd gear bush thing is a red herring. This bush seems to be fixed to the shaft and doesnt move ,if so how can it wear to allow lateral movement? also the oil seal spacer doesnt move or come loose which it would have to do to allow the sprocket to wobble without slackening the nut .
its the nut that comes loose for whatever reason so just loctite the bugger.
Just my observations and opinion.
Just looking at the parts list again , it sure does look like there's a step/shoulder in the shaft before the 2nd gear bush . its a bit blurred but its there IMO. The unobtainable bearing must fit up against this shoulder making everyting nice and solid
Edited by lemonentrails, 23 November 2007 - 01:12 am.
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#25
Readmarx
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Posted 23 November 2007 - 08:50 am
Interesting. I'll check my own sprocket next week. my front is an aftermatket j&t and I don't remember there being a step on it and I've been using aftermarket sprockets for a few years and have had the nuts coming loose. what stormy says about spacing out the sprocket makes sense to me entirely. what depth of spacing is necessary? I have a couple of old nut washers I could use.
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#26
wicklamulla
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Posted 23 November 2007 - 10:04 am
i have tried using an aftermarket sprocket afore and it was too thick and would not permit me to fit a locking tab washer so i sent it back to the suplier and they sent me a genuine yam one instead, problem solved. will post a pic of a fr. sprocket laters xxxxxxxxxxx
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#27
stormy
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Posted 23 November 2007 - 01:48 pm
QUOTE(lemonentrails @ Thu 22nd Nov 2007, 11:03 PM) <{POST_SNAPBACK}>
Just looking at the parts list again , it sure does look like there's a step/shoulder in the shaft before the 2nd gear bush . its a bit blurred but its there IMO. The unobtainable bearing must fit up against this shoulder making everyting nice and solid
The unobtainable bearing is £18.30+vat .........
On the shaft that I have been fettling ......... (hang on, think I'll rephrase that!) ....
On the shaft from my bikes' gearbox, there is no shoulder. About one third distance from the sprocket end, there is a shoulder where a locating washer sits to make a shoulder for the gear wheel to butt up against. Once the gearwheel is fitted, together with its inner bearing shell, the main ball bearing is then pressed up against the gearwheel hub, and it contacts at the inner race diameter. Then the oil seal spacer is fitted (over the top of the "o" ring) and that butts up against the outside of the main bearings' inner race diameter.
Then you'd fit a correct sprocket, a new tab washer and ideally a new nut.
Then you'd go fer a ride.
Edited by stormy, 23 November 2007 - 01:51 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!
#28
dandywarhol
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Posted 23 November 2007 - 06:26 pm
QUOTE(stormy @ Fri 23rd Nov 2007, 01:33 PM) <{POST_SNAPBACK}>
The unobtainable bearing is £18.30+vat .........
On the shaft that I have been fettling ......... (hang on, think I'll rephrase that!) ....
On the shaft from my bikes' gearbox, there is no shoulder. About one third distance from the sprocket end, there is a shoulder where a locating washer sits to make a shoulder for the gear wheel to butt up against. Once the gearwheel is fitted, together with its inner bearing shell, the main ball bearing is then pressed up against the gearwheel hub, and it contacts at the inner race diameter. Then the oil seal spacer is fitted (over the top of the "o" ring) and that butts up against the outside of the main bearings' inner race diameter.
Then you'd fit a correct sprocket, a new tab washer and ideally a new nut.
Then you'd go fer a ride.
On the shaft that I have been fettling ......... (hang on, think I'll rephrase that!) ....
On the shaft from my bikes' gearbox, there is no shoulder. About one third distance from the sprocket end, there is a shoulder where a locating washer sits to make a shoulder for the gear wheel to butt up against. Once the gearwheel is fitted, together with its inner bearing shell, the main ball bearing is then pressed up against the gearwheel hub, and it contacts at the inner race diameter. Then the oil seal spacer is fitted (over the top of the "o" ring) and that butts up against the outside of the main bearings' inner race diameter.
Then you'd fit a correct sprocket, a new tab washer and ideally a new nut.
Then you'd go fer a ride.
Doubt you'd have the energy after fettlin' yer shaft
1967 Yamaha TD1C 250, 2014 Kawasaki W800, 2011 Aprilia Tuono 1000 V4, 2020 Yamaha XSR900
"At the cutting edge of technophobia" 
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