SV650.org - SV650 & Gladius 650 Forum



Bikes - Talk & Issues Newsworthy and topical general biking and bike related issues. No crapola!
Need Help: Try Searching before posting

Reply
 
Thread Tools
Old 12-02-18, 09:34 AM   #11
glang
Member
 
Join Date: Oct 2007
Posts: 535
Default Re: Is this sprocket too worn?

I think everything wears together so if you put a new sprocket on the teeth spacing will be slightly closer than the original so the old chain will only really be in contact with one tooth at a time. Then instead of the load being shared by all the teeth it will be concentrated on each one individually so wearing them rapidly until they reach the same spacing as the chain (and old sprocket) when the load will once again be shared and the wear rate slows. Unfortunately I think that during this process the chain is also temporarily more stressed so increasing its wear rate until it all settles down again.
glang is offline   Reply With Quote
Old 12-02-18, 11:15 AM   #12
Heorot
Member
 
Join Date: Jul 2012
Location: South Norfolk
Posts: 341
Default Re: Is this sprocket too worn?

After getting a puncture in the back tyre repaired I noticed that the chain was too slack so I took the bike back to get it fixed. The mechanic (who is a biker himself) pointed out that the sprockets were wearing and that I should always replace both sprockets and the chain at the same time. So next time it is serviced it will get done. As the bike is on the original set and has done nearly 20,000 miles I don't think I have done too bad.
__________________
Some say the cup is half empty, while others say it is half full. However, both are wrong; the real problem is the cup is too big.

Honda 125 CG blown engine Gone to the great mechanic in the sky
Naked SV650 K3 in Silver
Heorot is offline   Reply With Quote
Old 12-02-18, 12:25 PM   #13
glang
Member
 
Join Date: Oct 2007
Posts: 535
Default Re: Is this sprocket too worn?

Fortunately the sprockets are the cheap bits (unless you go for something fancy of course) however I think the quality of the chain can make a difference on lifespan. 20k is pretty good and apparently with auto lubricators that can be stretched (pun intended) up to 40k.
glang is offline   Reply With Quote
Old 12-02-18, 12:31 PM   #14
R1ffR4ff
Member
Mega Poster
 
R1ffR4ff's Avatar
 
Join Date: Feb 2017
Location: JAMOADR(1999 Curvy) 36,000 miles
Posts: 1,427
Default Re: Is this sprocket too worn?

I agree with the,"Leave it until you need to replace the chain" posts.A JT kit for my 1999 Curvy is only around £66 quid.I fitted a DID kit last year but might go with the JT next time as they seem just as good for less and the sprockets that came with the DID chain were JT anyway
__________________
"Stultus est sicut stultus facit"
R1ffR4ff is offline   Reply With Quote
Old 12-02-18, 02:56 PM   #15
embee
Member
Mega Poster
 
embee's Avatar
 
Join Date: Jul 2003
Location: Warwickshire
Posts: 2,801
Default Re: Is this sprocket too worn?

As the chain wears the pitch gets bigger (clearances in the pins/bushes increases). As the sprockets wear the tooth pitch hardly changes, or with the front if anything the pitch gets smaller as the root of the tooth profile where the roller seats wears and the effective diameter gets slightly smaller. The net result whatever condition is that the loading gets concentrated on the take-up tooth. A new tooth profile is designed to meet the chain roller at an ideal angle, a worn tooth means the contact happens at a different angle so results in greater impact, making it less refined.
The bigger problem is often the hooking and the drag which can happen as the chain leaves the tooth on exit.
I tend to work on the principle that front sprockets get the hardest time and are usually the least expensive, so fitting a new one roughly halfway through the chain life can be effective and certainly gives a better condition than a worn one. I know it isn't an ideal or perfect situation, but only a complete new set of bits will give you that.
Entirely up to the individual, I certainly wouldn't suggest either as necessarily better.
__________________
"Artificial Intelligence is no match for natural stupidity"
embee is offline   Reply With Quote
Old 12-02-18, 04:46 PM   #16
SV650rules
Member
Mega Poster
 
Join Date: Nov 2016
Location: Shropshire UK
Posts: 1,357
Default Re: Is this sprocket too worn?

Quote:
Originally Posted by DomP View Post
Surely a front sprocket wears around 3 times faster as it has for example 16 teeth as opposed to the rears 40 odd so it each tooth contacts the chain three times for every one of the rears.

Just my take on it.

Sent from my SM-G903F using Tapatalk
+1

There is also more force on each front sprocket tooth as less teeth so less chain rollers in contact to spread the load over. Front sprockets don't normally cost too much.
__________________
2016 SV650 AL7

Courage is resistance to fear, mastery of fear, not absence of fear - Mark Twain

Last edited by SV650rules; 12-02-18 at 04:53 PM.
SV650rules is offline   Reply With Quote
Old 12-02-18, 05:41 PM   #17
glang
Member
 
Join Date: Oct 2007
Posts: 535
Default Re: Is this sprocket too worn?

youre right its just that, as I say, Ive found the new sprocket has slightly different pitch compared to the partially worn chain so the load instead of being spread is taken on individual teeth. This drastically accelerates the wear on the new front sprocket (and maybe the chain) until its pitch matches the chain and then the wear rate returns to normal. Effectively you have gained very little and may even have reduced the life of the chain....
glang is offline   Reply With Quote
Old 12-02-18, 05:43 PM   #18
DomP
Member
 
Join Date: Oct 2014
Location: Kington Herefordshire
Posts: 916
Default Re: Is this sprocket too worn?

Can 'o' worms!

Sent from my SM-G903F using Tapatalk
__________________
Black 2010 SV650S Fully faired
White 2011 YZF R125 sold
DomP is offline   Reply With Quote
Old 12-02-18, 09:30 PM   #19
Biker Biggles
Member
Mega Poster
 
Biker Biggles's Avatar
 
Join Date: Jan 2005
Location: Barnet Herts
Posts: 5,067
Default Re: Is this sprocket too worn?

If it aint broke------Fix it until it is broke.

Or just ride it until it wears out then buy another one.
__________________
On a clear day we stand there and look further than the ordinary eye can see.
Biker Biggles is offline   Reply With Quote
Old 13-02-18, 08:42 AM   #20
shiftin_gear98
Member
 
shiftin_gear98's Avatar
 
Join Date: Mar 2013
Location: At home
Posts: 756
Default Re: Is this sprocket too worn?

So yet another thread that concludes one thing.
We all do different things because we are all different people.


DomP - If you can be arsed to replace it and you want to, then the people have spoken - do it.
If you can't be fudged as other people have also spoken - leave it till it's all mullered.


I know which one I'd do.




(It is still cold in the garage and there are many other things that involve less swearing)
shiftin_gear98 is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Curvy rear brake disc, sprocket and sprocket carrier Bunkle Stuff Wanted 2 05-04-14 10:08 AM
And the award for the most worn chain and sprocket goes to.. LewSpeight Bikes - Talk & Issues 20 25-04-13 10:32 PM
Kreiga R25 worn once SVRIDER07 For Sale - Other Bikes and General biking items 0 04-07-12 07:45 PM
Standard front sprocket, bigger rear sprocket, how many more links in chain required? Holdup Bikes - Talk & Issues 6 27-02-12 12:40 PM
part worn 180/55/17 husky03 Stuff Wanted 0 02-02-11 09:11 PM


All times are GMT. The time now is 03:39 PM.


Powered by vBulletin® - Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.