What happened to my rear sprocket?! - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 44 Old 01-05-2011, 09:38 PM Thread Starter
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What happened to my rear sprocket?!

I went to tighten my chain tonight because things felt a bit sloppy on the ride home. Then I noticed this:










I'm not the most diligent at maintenance but I'm certainly not the worst. I don't check the sprocket a lot but I don't ignore it. I haven't noticed any degradation before, this came about fairly rapidly.

The front sprocket is fine and the chain looks ok too. What could cause something like this? Should I not ride it until I get a replacement? I'd only be riding about 15 miles daily on city streets to work.

I replaced the original chain and sprockets at 20,900 miles with a set from Blair. This set is currently 5 miles short of 10,000 miles.

Where are people buying sprockets these days?

Orange 2012 Wee (new in May 2013) - Richland Rich's fork brace and mirror extenders, Givi engine guards and top case, gel grips.
Black 2004 Wee with H&B engine guards, SV Racing Frame and Swing Arm sliders, Superbrace, Givi top case, gel grips

Last edited by thecdn; 01-05-2011 at 09:45 PM.
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post #2 of 44 Old 01-05-2011, 09:48 PM
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I wouldn't ride it.. it sure looks like it could skip quite easily and may have already.

I suspect your chain was loose enough that the chain was jumping over some of the teeth and that action stripped things. To my untrained eye your chain area looks way too clean and dry.

..Tom

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2012 DL650 139,500+ km, 86,700+ miles. Sold
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post #3 of 44 Old 01-05-2011, 09:52 PM
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Unhappy Worn chain sprocket

That is a worn out sprocket. Due either to poor quality metal sprocket, lack of lubrication, or too much dirt and sand.
Becareful out there
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post #4 of 44 Old 01-05-2011, 10:01 PM
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I agree with Tom.

Unless you are a demon chain-and-sprocket cleaner,
your chain has needed lubrication for a long time.

I spray my chain liberally (but not generously) every 500 miles,
and clean it with kerosene every 5000 miles or so, or just before
a long trip. You can find lots of info on chain maintenance here.

And no, do not ride an inch until you get a new rear sprocket.

I cannot understand how your chain and front sprocket can be OK
when there is such catastrophic damage to the rear sprocket.
Please get a pro to examine those components before riding.

My first chain and sprockets lasted 22000 miles, and so did my second.
With my third chain and third front sprocket, I re-used a rear sprocket,
but that rear sprocket is mounted backward, with five washers to
align it properly with the front sprocket. All is well, and I definitely do
not see any increased chain wear or any other symptoms of trouble.
I have run 18000 miles this way, and the chain will likely last another
four thousand miles, then it will be time for another front sprocket,
another chain, and reverse mounting of the original rear sprocket.

I get my sprockets from my friendly local Suzuki Dealer, here in Sarasota.
I buy chain lubricant from any bike shop, most recently from a Harley store.

By the way, if your handle means you are a Canadian, you are not alone.
So am I.

Keith

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post #5 of 44 Old 01-05-2011, 10:13 PM Thread Starter
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I had lubed the chain the night before last, I lube the top and bottom so the side might look dry. And it needed a cleaning but it wasn't too bad. I don't let it get that dry/dirty. Don't make me out to be someone who doesn't maintain his bike.

I took the bike to my mechanic a week ago because I was having problems getting new rear brake pads to work. He had the bike on a rear stand to spin the wheel and took it for a test drive and didn't notice anything out of the ordinary.

Orange 2012 Wee (new in May 2013) - Richland Rich's fork brace and mirror extenders, Givi engine guards and top case, gel grips.
Black 2004 Wee with H&B engine guards, SV Racing Frame and Swing Arm sliders, Superbrace, Givi top case, gel grips
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post #6 of 44 Old 01-05-2011, 10:29 PM
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Replace that sprocket with one made from steel.
Grab you owners manual and find the section on measuring your chain for wear, then measure your chain.

I'd bet that your chain is out of spec.
Replace the chain and both sprockets--don't go for the BS about an aluminum sprocket being better than steel. You are not racing your bike (so the weight difference shouldn't be a major factor) and need these parts to last.
I've been told something like:
The aluminum sprocket is coated with some stuff that is harder than steel, it will be fine, this is what the racers all use...

Don't believe that line of crap for a second.










.

L2V -- she's a stocker!...and gone...
2011 MG Stelvio
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post #7 of 44 Old 01-05-2011, 10:36 PM
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Where did the lubrication go?

I'm sorry if you feel offended by my opinion, thecdn.
I see no trace of lubrication in your photographs,
and the rear sprocket is a total disaster.

If you replace the sprocket only, you may see accelerated wear of the old front sprocket, old chain, and new rear sprocket. The principal reason for this is that wear increases the length of a chain, and widens the gaps between a sprocket's teeth. For a while, the old chain will not precisely fit the new sprocket.

I stand on this opinion, though: a proper chain, given proper chain tension and
proper chain lubrication will not cause the symptoms your rear sprocket exhibits.

Good luck with your repairs.
Keith

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post #8 of 44 Old 01-05-2011, 10:43 PM Thread Starter
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Quote:
Originally Posted by Keith Falkner View Post
I'm sorry if you feel offended by my opinion, thecdn.
Not offended, just wanted to correct the notion that I didn't lube the chain in a reasonable manner. Might occasionally go longer than I should between lubes, but not that much and not regularly.

Will be calling Competition to see what they have tomorrow morning and will measure the chain.

Orange 2012 Wee (new in May 2013) - Richland Rich's fork brace and mirror extenders, Givi engine guards and top case, gel grips.
Black 2004 Wee with H&B engine guards, SV Racing Frame and Swing Arm sliders, Superbrace, Givi top case, gel grips
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post #9 of 44 Old 01-05-2011, 10:48 PM
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The suzuki oem rear sprocket should easily last through 2 chains and 3 front sprockets if properly aligned, tensioned, and lubed.
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post #10 of 44 Old 01-05-2011, 11:11 PM Thread Starter
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I just measured the chain and it falls within the specs of the manual. My son and I both gave it a good look and it seems fine and as I mentioned the front sprocket looks great.

Will be replacing the rear sprocket soonest with a steel one then will take the bike to my mechanic for a more professional opinion.

Orange 2012 Wee (new in May 2013) - Richland Rich's fork brace and mirror extenders, Givi engine guards and top case, gel grips.
Black 2004 Wee with H&B engine guards, SV Racing Frame and Swing Arm sliders, Superbrace, Givi top case, gel grips
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