2006 RM250 chain rubbing the engine case

kwenske321
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kwenske321
See photo below, built this motor roughly 10-12 hrs ago and noticed today the chain has been rubbing against the case. What could be the cause of this? Sure doesn't seem right. Has anyone seen or had this issue? It's worth noting the bike is a 2006 and I used 2007 cases, but not sure this is the cause being most of all the parts in both years are the same part number. Your help and feed back is appreciated! Thanks.





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ajf55
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ajf55 8/21/2016 4:47pm
8/21/2016 4:47pm
Just worked on a crf450 that the same thing happened too. It had a did 520 chain on it but it was wider than any other 520 o ring chain I've ever seen. The crf I saw was much worse however. Probably 1.5mm of metal taken out of the case. I'm also wondering if anyone has the answer to this.
mxb2
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mxb2 8/21/2016 4:58pm
8/21/2016 4:58pm
ajf55 wrote:
Just worked on a crf450 that the same thing happened too. It had a did 520 chain on it but it was wider than any other...
Just worked on a crf450 that the same thing happened too. It had a did 520 chain on it but it was wider than any other 520 o ring chain I've ever seen. The crf I saw was much worse however. Probably 1.5mm of metal taken out of the case. I'm also wondering if anyone has the answer to this.
What year crf?
fulltime wrench 8/21/2016 5:48pm
8/21/2016 5:48pm
O-ring chains are wider than a standard chain and some are wider than another brand of o-ring chain. You should be able to find a spacer to put behind the sprocket. Not too thick or you will never be able to get the snap ring on the countershaft.

Two things worth doing before you hunt down a spacer. First, inspect the inner side of the chain for damaged link(s). The chain could be rubbing in one spot but staying clear otherwise. Secondly, make sure your chainline is as straight as possible. Use a tape measure to check the distance between the swingarm pivot and the axle. Try your best to find the centerline of the pivot and axle to measure from. The two measurements should be within a 1/16th of an inch to be considered straight.
mxb2
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mxb2 8/21/2016 6:46pm
8/21/2016 6:46pm
fulltime wrench wrote:
O-ring chains are wider than a standard chain and some are wider than another brand of o-ring chain. You should be able to find a spacer...
O-ring chains are wider than a standard chain and some are wider than another brand of o-ring chain. You should be able to find a spacer to put behind the sprocket. Not too thick or you will never be able to get the snap ring on the countershaft.

Two things worth doing before you hunt down a spacer. First, inspect the inner side of the chain for damaged link(s). The chain could be rubbing in one spot but staying clear otherwise. Secondly, make sure your chainline is as straight as possible. Use a tape measure to check the distance between the swingarm pivot and the axle. Try your best to find the centerline of the pivot and axle to measure from. The two measurements should be within a 1/16th of an inch to be considered straight.
Fastway makes the spacer your mentioning.

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imoto34
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imoto34 8/21/2016 7:20pm
8/21/2016 7:20pm
What chain are you using?
kwenske321
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kwenske321 8/21/2016 7:44pm
8/21/2016 7:44pm
It's worth noting I was not using an O-ring chain. I have been using a did 520 ert2.
imoto34
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imoto34 8/21/2016 8:01pm
8/21/2016 8:01pm
kwenske321 wrote:
It's worth noting I was not using an O-ring chain. I have been using a did 520 ert2.
Next thing go ahead and make sure it is straight back to the rear and eyes could lie so take your time and measure.
imoto34
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imoto34 8/21/2016 8:03pm
8/21/2016 8:03pm
Once the wheel is straight, mow much of a gap is from the chain to the case clocked in different spots to make sure you don't have a loose link you didn't notice.
kwenske321
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kwenske321 8/21/2016 8:09pm
8/21/2016 8:09pm
imoto34 wrote:
Once the wheel is straight, mow much of a gap is from the chain to the case clocked in different spots to make sure you don't...
Once the wheel is straight, mow much of a gap is from the chain to the case clocked in different spots to make sure you don't have a loose link you didn't notice.
What's the most accurate method to make sure it is straight?
RussB
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RussB 8/22/2016 12:36am
8/22/2016 12:36am
What brand sprocket are you using?
Have you installed it correctly? There should be a 2-3mm wide spacer built into the sprocket that sits up against the metal ring inside of the shaft seal.
ajf55
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ajf55 8/22/2016 2:18am
8/22/2016 2:18am
ajf55 wrote:
Just worked on a crf450 that the same thing happened too. It had a did 520 chain on it but it was wider than any other...
Just worked on a crf450 that the same thing happened too. It had a did 520 chain on it but it was wider than any other 520 o ring chain I've ever seen. The crf I saw was much worse however. Probably 1.5mm of metal taken out of the case. I'm also wondering if anyone has the answer to this.
mxb2 wrote:
What year crf?
04
mxb2
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mxb2 8/22/2016 5:52am
8/22/2016 5:52am
ajf55 wrote:
Just worked on a crf450 that the same thing happened too. It had a did 520 chain on it but it was wider than any other...
Just worked on a crf450 that the same thing happened too. It had a did 520 chain on it but it was wider than any other 520 o ring chain I've ever seen. The crf I saw was much worse however. Probably 1.5mm of metal taken out of the case. I'm also wondering if anyone has the answer to this.
mxb2 wrote:
What year crf?
ajf55 wrote:
04
Look at fast way spacer, also like others mentioned,wheel chain,all aligned correctly. Some require the spacer depending on chain. Use a did ert2, u you won't have a problem
ajf55
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ajf55 8/22/2016 7:16am
8/22/2016 7:16am
mxb2 wrote:
What year crf?
ajf55 wrote:
04
mxb2 wrote:
Look at fast way spacer, also like others mentioned,wheel chain,all aligned correctly. Some require the spacer depending on chain. Use a did ert2, u you won't...
Look at fast way spacer, also like others mentioned,wheel chain,all aligned correctly. Some require the spacer depending on chain. Use a did ert2, u you won't have a problem
Haha thanks. I actually had a did ert laying around that I threw on there.
YZ125H1
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YZ125H1 8/22/2016 2:36pm
8/22/2016 2:36pm
When I purchased my 04 it had an oring chain not sure on the brand no extra spacer. I never split my cases only replaced the cs shaft seals. Now I have an ert2 mounted so there is plenty of space.
Falcon
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Falcon 8/22/2016 2:48pm
8/22/2016 2:48pm
That bike has a left-hand spacer and a right-hand spacer on the rear wheel. Make sure you are using the correct one on each side.
mxb2
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mxb2 8/22/2016 3:10pm
8/22/2016 3:10pm
ajf55 wrote:
04
mxb2 wrote:
Look at fast way spacer, also like others mentioned,wheel chain,all aligned correctly. Some require the spacer depending on chain. Use a did ert2, u you won't...
Look at fast way spacer, also like others mentioned,wheel chain,all aligned correctly. Some require the spacer depending on chain. Use a did ert2, u you won't have a problem
ajf55 wrote:
Haha thanks. I actually had a did ert laying around that I threw on there.
Work ok now?
Sr_Vet_Rider 8/22/2016 3:22pm
8/22/2016 3:22pm
I have an '04 and just went out to see how much space is behind the chain (also using a DID ERT2). Is it possible you have the sprocket flipped backwards ? If you've already checked that or know that it's not, maybe your sprocket is for a different bike/ year ? I have plenty of clearance behind mine, at least 2-3mm... I don't think chain alignment would cause it to move over enough to rub, but having the rear wheel spacers mixed up (as mentioned) could probably do it.
racinstation 8/23/2016 6:59am
8/23/2016 6:59am
I would tend to agree with the sprocket being on backward. If you look closely at the countershaft seal you can see that the 2 to 8 o'clock area is rubbed pretty good. The lip on the sprocket should rest on the spacer that is inside the seal and keep it away from the case and seal.

kwenske321
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kwenske321 8/23/2016 7:11am
8/23/2016 7:11am
The sprocket was flipped backwards, and I am officially a dumba$$! The sprocket is a PBI brand and the tooth count etc is etched on one side of the sprocket. In past experiences I typically associated the etchings to be on the outside so you can clearly see what sprocket your running without actually counting teeth. not with this brand!

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