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Help- cylinder wall marks- is it a problem?

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Old Jan 4, 2017 | 08:59 PM
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Default Help- cylinder wall marks- is it a problem?
Ok here is the deal, I just tore down the motor to add some ported and polished heads. My 107 kit has about 2500 miles so far. When I removed the old heads I noticed some marks on the cylinder walls. The front cylinder seems to have more marks then the rear. Is this something to worry about? The marks can't be felt with a fingernail.
 
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Last edited by Olsen185; Jan 4, 2017 at 09:02 PM.
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Old Jan 4, 2017 | 11:32 PM
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Pretty normal. If you can't feel it by fingernail, it doesn't smoke, then run it.
 
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Old Jan 5, 2017 | 06:48 AM
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I think ide be pulling them,torque plateing & checking for out of round & taper,ide also check ring condition.marks like that are defanatley NOT normal
 
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Old Jan 5, 2017 | 08:28 AM
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Normal and not normal, gotta love getting advice on the Internet. Was it running ok?
 
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Old Jan 5, 2017 | 11:47 AM
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Originally Posted by roussfam
Normal and not normal, gotta love getting advice on the Internet. Was it running ok?
Yup bike was running great. Just had some money to burn so I ordered a set of heads.
 
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Old Jan 5, 2017 | 01:19 PM
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Originally Posted by roussfam
Normal and not normal, gotta love getting advice on the Internet. Was it running ok?



just cause its running OK,dosnt mean it shouldn't get looked at.if you drain your oil and its full of metal,but its running OK,your good to go I guess
 
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Old Jan 5, 2017 | 01:27 PM
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YES.......there is a problem......NOT supposed to look like that.....as to what is wrong...I don't know....not gonna guess.......have it checked!
 
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Old Jan 5, 2017 | 01:59 PM
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You already have it apart, what would the reason be to NOT have it checked? You yourself know there could be an issue thats why you posted a question. A professional , prodrag1320, has given you an opinion that should be valued. Seems silly not to have it checked at this point.
 
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Old Jan 5, 2017 | 02:57 PM
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The middle pic is disconcerting. 1 and 3 show some ghosting at the cylinder studs and oil drain passage but that is common.. More so on virgin cylinders than ones that have seen a bunch of heat cycles before boring. It's probably more prevalent on the 3.938 bores too. I'd be a little concerned about the cylinder finish.. looks like it was done with too fine a stone.. As the crosshatch is weak. I agree with Kirby, pull them. have them checked..
 
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Old Jan 5, 2017 | 03:08 PM
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Originally Posted by prodrag1320
just cause its running OK,dosnt mean it shouldn't get looked at.if you drain your oil and its full of metal,but its running OK,your good to go I guess
My guess would be no..

You gotta be careful, some people might not recognize sarcasm...
 
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