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Old 01-25-2013, 09:43 AM   #1
CDN_bacon
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First 250 Top End Build

So this week my valves went on my CRF. I was planning to take the bike to Chad to have the bike rebuilt but he is swamped and to be honest its been a very expensive month so I made the decision last night to save some money and take it upon myself as a project to learn how to do this.

So out to the garage late last night and away I went. I got the head, cylinder and piston removed. Question #1... cylinder. What do you guys think of the condition of this? I hear mention of glazing but I'm not sure how to tell if its glazed or not? How do you know when the cylinder has to be replaced and the vertical marks worry me a bit. Um stupid question but should I be mic'ing the diameter?

Thoughts?

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Old 01-25-2013, 09:51 AM   #2
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Can you physically feel those vertical scars in the cylinder? Looks very minimal. If I had to money to spend, i'd fix the cylinder. If not, I might leave it as is and continue to replace the piston, rings, etc..
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Old 01-25-2013, 09:55 AM   #3
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How deep are the scratches? There is no hairline cracks behind the scratch, correct? I don't think it'll need re-plating if they aren't that deep. I know this happens sometimes from not letting the bike warm up before using it. Cause of the heated expansion in head and not on the walls yet. But it also just happens.

Usually glazing is a high pressure BURN of the oil which bonds to the cylinder walls... usually do to improper break in procedure.... or just a worn out engine that has been run to death... So the walls will look a little burnt. I do not see that here.
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Old 01-25-2013, 10:04 AM   #4
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To be honest I haven't checked how deep they are. I was tired by the time I got it apart and left it to go to bed.

I was planning on putting in a new piston and rings anyways although I tossed around the idea of putting an R head on the X bike (highly recommended on TT) but I don't want to spend the money for a new head. Instead I'm going to drop in an R cam that I have and put in a JE hi compression piston and see how that runs. Combo seems to have good feedback on TT but I'm a bit leery on the HC piston and heat issues.
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Old 01-25-2013, 10:06 AM   #5
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Well check the scratches with your finger or finger nail and let us know.
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Old 01-25-2013, 10:10 AM   #6
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Well check the scratches with your finger or finger nail and let us know.
Yep, your fingernail should not get "caught" in the groove. If you only feel a slight scratch with your nail, you should be OK. It doesnt look bad in the pics.
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Old 01-25-2013, 10:14 AM   #7
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Looks fine. Just needs to be honed. If you want to drop the cylinder and head off I can get the cylinder honed and the new seats cut. And call me if you have any questions!
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Old 01-25-2013, 10:34 AM   #8
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Looks fine. Just needs to be honed. If you want to drop the cylinder and head off I can get the cylinder honed and the new seats cut. And call me if you have any questions!
What he said! Shooting you a PM Chad!
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Old 01-25-2013, 10:48 AM   #9
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Old 01-25-2013, 10:52 AM   #10
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Looks fine. Just needs to be honed. If you want to drop the cylinder and head off I can get the cylinder honed and the new seats cut. And call me if you have any questions!
+1
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Old 01-25-2013, 11:04 AM   #11
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Looks fine. Just needs to be honed. If you want to drop the cylinder and head off I can get the cylinder honed and the new seats cut. And call me if you have any questions!
+1 let chad take care of ya


the cylinder looks good, you can still see the cross haching and the vertical wear look normal but to have it honed is usually pretty cheap so I would just get it done since its apart
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Old 01-29-2013, 04:24 PM   #12
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Cleaned up the cylinder with a brilla pad and the vertical marks pretty much disappeared and can't feel them with a finger nail running across.

Anyone got a flywheel puller that will work on a CRF that I can borrow (changing cam chain)
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Old 01-29-2013, 04:28 PM   #13
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Quote:
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Cleaned up the cylinder with a brilla pad and the vertical marks pretty much disappeared and can't feel them with a finger nail running across.

Anyone got a flywheel puller that will work on a CRF that I can borrow (changing cam chain)
come get it
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Old 02-11-2013, 09:41 PM   #14
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Alright. Flywheel is off, cam chain replaced surprisingly very easy and I just got my head back from AS Racing. Great service! Tomorrow night reassembly begins.

Before:
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After:
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