Chain jumping - SV650.org

Winder · 02-10-13, 06:47 PM

Old chain and sprockets done 20k miles and was jumping about lots so I have changed them.

New chain is on and jumps a little but nowhere near as bad as the old one. I can feel it jump when I'm riding.

•Bike is a 2005 SV650s
•Brand new chain and sprockets
•Chain tension is 35mm
•All chain links and rollers are free moving
•Oil level is bang on half way between F and E
•Cush rubbers in good nick
•Every nut torqued up
•Wheels aligned and chain running straight.

Think that's everything.
Could you advise on my next thing to check over?
Thanks

Video of jumping chain
http://youtu.be/JlvtHyiGLZA

Tomor · 02-10-13, 06:49 PM

Coolant level / renew?

Winder · 02-10-13, 06:54 PM

Coolant changed about 6k miles ago ish. Will check the service book.
How would that make the chain skip around?
Level is about 3mm below Full

Tomor · 02-10-13, 06:58 PM

Oh, I though you were just stating that you had put a new C+S kit on and were asking what to do next in general. I don't know why the chain is still jumping. Try putting it on the 20mm side of tension and see if it still does it?

Bibio · 02-10-13, 07:09 PM

that is perfectly normal while sat on a paddock stand in gear and at tickover or slight throttle.

punyXpress · 02-10-13, 07:14 PM

Probably quite normal.
The V twin has firing impulses that are not evenly matched, so the chain is only 'driving' the back wheel part of the time. At low revs this would have the effect you can see and feel.
If you can follow this you're doing well!
I lost the plot on line two.
Best of luck.

DJ123 · 02-10-13, 08:13 PM

It's about to implode. Quite clearly it's a sign to get a new bike, something like a Tiger 800?

Viney · 02-10-13, 10:11 PM

Correct chain and sprocket combo?

Did you buy separately or as a kit?

Never ever heard of this on a new chain. Never had this. My Bike has had a few chains over the years. Tighten chain a little more to see if it resolves it.
-------
Sent using the power of Moomins

03-10-13, 12:32 AM

Looks a little slack to me. My manual says 20-30mm, and I always recheck after the first ride. Chains commonly get a little longer after they've been run in.

Winder · 03-10-13, 07:20 PM

Still does it at 20mm. I have always kept SV chain at 30/35mm of play but can't say I ever noticed it jumping about like this before on any of my bikes.

Chain and sprockets correct match, matched up with the ones I took off too although obviously the old ones were very worn.

I'll just keep an eye on it. If people say its normal and they have this jumping also then I'm not that bothered.

02-10-13, 06:47 PM	#1
Winder Member Join Date: Mar 2011 Location: Moved again now in Bracknell Posts: 981	Chain jumping Old chain and sprockets done 20k miles and was jumping about lots so I have changed them. New chain is on and jumps a little but nowhere near as bad as the old one. I can feel it jump when I'm riding. •Bike is a 2005 SV650s •Brand new chain and sprockets •Chain tension is 35mm •All chain links and rollers are free moving •Oil level is bang on half way between F and E •Cush rubbers in good nick •Every nut torqued up •Wheels aligned and chain running straight. Think that's everything. Could you advise on my next thing to check over? Thanks Video of jumping chain http://youtu.be/JlvtHyiGLZA __________________ "Somewhere between happy and total f*kin wreck" Last edited by Winder; 02-10-13 at 06:51 PM.*

02-10-13, 06:49 PM	#2
Tomor Member Mega Poster Join Date: Oct 2011 Location: Yateley, Hants Posts: 2,306	Re: Chain jumping Coolant level / renew? __________________ Yam XT125R - Sold SV650 -Sold DL 650 K6 - Sold 2012 Street Triple R - For Sale - Linky here

02-10-13, 06:54 PM	#3
Winder Member Join Date: Mar 2011 Location: Moved again now in Bracknell Posts: 981	Re: Chain jumping Coolant changed about 6k miles ago ish. Will check the service book. How would that make the chain skip around? Level is about 3mm below Full __________________ "Somewhere between happy and total f*kin wreck" Last edited by Winder; 02-10-13 at 06:55 PM.*

02-10-13, 06:58 PM	#4
Tomor Member Mega Poster Join Date: Oct 2011 Location: Yateley, Hants Posts: 2,306	Re: Chain jumping Oh, I though you were just stating that you had put a new C+S kit on and were asking what to do next in general. I don't know why the chain is still jumping. Try putting it on the 20mm side of tension and see if it still does it? __________________ Yam XT125R - Sold SV650 -Sold DL 650 K6 - Sold 2012 Street Triple R - For Sale - Linky here

02-10-13, 07:09 PM	#5
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: Chain jumping that is perfectly normal while sat on a paddock stand in gear and at tickover or slight throttle.

02-10-13, 07:14 PM	#6
punyXpress Member Mega Poster Join Date: Feb 2008 Location: Riding, North Posts: 2,664	Re: Chain jumping Probably quite normal. The V twin has firing impulses that are not evenly matched, so the chain is only 'driving' the back wheel part of the time. At low revs this would have the effect you can see and feel. If you can follow this you're doing well! I lost the plot on line two. Best of luck. __________________ Was: K2 naked in rapid yellow - gone to a better? place Now: Street Triple R

02-10-13, 08:13 PM	#7
DJ123 Member Mega Poster Join Date: Jul 2011 Location: Somewhere over there Posts: 3,245	Re: Chain jumping It's about to implode. Quite clearly it's a sign to get a new bike, something like a Tiger 800? __________________ BMW F800ST

02-10-13, 10:11 PM	#8
Viney Member Mega Poster Join Date: Jul 2003 Location: In the shadows to the left Posts: 7,700	Re: Chain jumping Correct chain and sprocket combo? Did you buy separately or as a kit? Never ever heard of this on a new chain. Never had this. My Bike has had a few chains over the years. Tighten chain a little more to see if it resolves it. ------- Sent using the power of Moomins

03-10-13, 12:32 AM	#9
wideguy Guest Posts: n/a	Re: Chain jumping Looks a little slack to me. My manual says 20-30mm, and I always recheck after the first ride. Chains commonly get a little longer after they've been run in.

03-10-13, 07:20 PM	#10
Winder Member Join Date: Mar 2011 Location: Moved again now in Bracknell Posts: 981	Re: Chain jumping Still does it at 20mm. I have always kept SV chain at 30/35mm of play but can't say I ever noticed it jumping about like this before on any of my bikes. Chain and sprockets correct match, matched up with the ones I took off too although obviously the old ones were very worn. I'll just keep an eye on it. If people say its normal and they have this jumping also then I'm not that bothered. __________________ "Somewhere between happy and total f**kin wreck"

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