Sprocket barely rubbing against chain guide rubber?

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10/30/2017 3:05 PM

It's barely hitting when I have the bike on the stand to wear you can hear it go 'tss tss tss tss' when I spin the wheel. What's causing this and how do I fix it? 2001 cr125Photo

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10/30/2017 3:40 PM

Did you adjust the chain tension I had this probably once when I adjusted my chain and it's was cock eyed abit

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10/30/2017 3:44 PM

Perhaps it got bent from a rock, root or just hard ground, I try to bend it out of the way just alittle

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10/31/2017 6:11 PM

It looks like the sprocket is cracked or has a defect ? If that is a crack maybe it's slightly bent causing it to rub.

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10/31/2017 6:46 PM

hellbillyohio wrote:

It looks like the sprocket is cracked or has a defect ? If that is a crack maybe it's slightly bent causing it to rub.

It's not cracked or bent it's brand new

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10/31/2017 10:11 PM

Either the chain guide is bent or the rear wheel isn't square.

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Race Bike: 2018 KTM 350SXF

Other Bikes: 1985 CR80R, 1990 CR250R, 1998 PW80, Specialized Fuse Comp 29.

Sold: 2016 YZ250F, 2012 CRF250R

11/1/2017 1:12 AM

Looks like the slot isnt wide enough for the sprocket. If its brand new and yor wheel is straight then just run it and let the new sprocket clear out the slot a bit.

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2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

11/1/2017 7:40 AM

The top rear of that chain guide plastic should line up with the top of the aluminum guide housing. Either your housing is bent down or the inner guide is bent/deformed up. I would pull it off the bike and determine which. Unless you’re running a large sprocket there shouldn’t be any rubbing at the leading edge, when I put them back on, I also bend the rear ends of the inner guide out a little to preload them against the aluminum.

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11/1/2017 8:04 AM

Could you get a better photo of what appears to be a crack in that sprocket?

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11/1/2017 8:28 AM

imoto34 wrote:

Could you get a better photo of what appears to be a crack in that sprocket?

That looks cracked af

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2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600

11/1/2017 8:41 AM

Hey I just looked over the sprocket cause it did look cracked in the pic but it's not. It's just a molding mark and there's no cracks on it at all! Also the wheel is straight and has not bends or cracks at all. As for the rubbing it just barely rubs. And the teeth on the sprocket don't rub at all. The only rubbing is these things as shown in the picture below. It only rubs on the back rubber part.
Photo

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11/1/2017 8:54 AM
Edited Date/Time: 11/1/2017 8:55 AM

Also the sprocket is inside the guide evenly and straight, however it sits way over to one side while the other side has plenty of room. So basically the issue here is that for some reason it's sitting about 1 or 2 mm too far on one side. What would cause this and how would I fix it?

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11/1/2017 9:16 AM

z71will wrote:

Also the sprocket is inside the guide evenly and straight, however it sits way over to one side while the other side has plenty of room. So basically the issue here is that for some reason it's sitting about 1 or 2 mm too far on one side. What would cause this and how would I fix it?

They are easily warped or bent in a crash. I would just try and get it a little more to your liking by hand and run it.

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11/1/2017 9:22 AM

imoto34 wrote:

Could you get a better photo of what appears to be a crack in that sprocket?

Acidreamer wrote:

That looks cracked af

That’s a stamped sprocket, not a machined/laser cut one. I’ve seen marks like that before, it’s where the metal shears in the stamping process.

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11/1/2017 1:18 PM

Happened on every Honda I've ever had. I safety wire both sides of the guides and if that doesn't work I'll file the guide where it rubs.

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11/1/2017 8:34 PM

Measure the adjustment on your axle blocks with a dial caliper to ensure your wheel is 100% straight. Could just need a good sanding down to make it so it doesn't rub.

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2019 TX300
'10 200 XC-w

11/3/2017 9:04 AM

I'd bet the guide is bent. My 2012 Honda slipped off the ramp when unloading once. It just clipped the side of the ramp with the chain guide and bent it enough to rub. A rubber mallet was all I needed to re-square it.

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Race Bike: 2018 KTM 350SXF

Other Bikes: 1985 CR80R, 1990 CR250R, 1998 PW80, Specialized Fuse Comp 29.

Sold: 2016 YZ250F, 2012 CRF250R