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Help me methodically diagnose a rattle... Help me methodically diagnose a rattle...
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
Photo by Marc Gibaud, Clouds on Tres Cerros and Mount Fitzroy, Argentinian Patagonia

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Photo by Marc Gibaud,
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Mount Fitzroy, Argentinian Patagonia



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  #1  
Old 27 Jul 2006
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OK, I ripped it apart.

Piston Crown



Alternate angle: http://img99.imageshack.us/img99/2482/cimg0423br4.jpg

Cylinder Head & Valves



Alternate angles:

http://img220.imageshack.us/img220/930/cimg0412kh2.jpg

http://img99.imageshack.us/img99/4018/cimg0416lq3.jpg

Cylinder Bore



Alternate angle: http://img220.imageshack.us/img220/245/cimg0429lu5.jpg
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  #2  
Old 27 Jul 2006
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I will remove the cylinder tomorrow and play around with the conrod, but this looks like there might be evidence for my theory. I haven't seen many heads & crowns, but having that much visible carbon build-up can't be good. Couldn't/wouldn't bits of it heat up and produce detonation?

As for the bore, I can still see the horizontal marks from when the sleeve was machined, though there's a bit of scuffing on the front part of the bore. Doesn't look too bad, does it? I'll see if I can't get measure the clearance tomorrow.

Now looking at the piston crown, I see an irregular circle in the center, which is actually a slightly raised area. I assume that's normal and not a sign of damage?

Anyway, do these pics say anything to you guys?
Last edited by electric!sheep; 27 Jul 2006 at 06:31.
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  #3  
Old 27 Jul 2006
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Nothing wrong
With your topend. The amount of carbon deposit is normal. It also shows your bike is not loosing oil via the cilinder / piston gap, as oil tends to dissolve the deposits on the piston crown, which would manifest as a clean edge on the piston crown.

Auke
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  #4  
Old 27 Jul 2006
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Bummer, so much for my optimistic theories.

Any tips on diagnosing the small-end and big-end bearings on the conrod, once I pull the jug? Check for play, smoothness?
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  #5  
Old 27 Jul 2006
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Looks about normal, cylinder might be worn close to its limit maybe causing a bit of piston slap when cold. If the bike was run withlow oil the camshaft bearing surfaces would show damage first, how do they look?
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  #6  
Old 28 Jul 2006
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Quote:
Originally Posted by winmac
Looks about normal, cylinder might be worn close to its limit maybe causing a bit of piston slap when cold. If the bike was run withlow oil the camshaft bearing surfaces would show damage first, how do they look?
Here you go, with my other XT600 for comparison (similar mileage, different dipshit owner who probably checked valve clearances with his toenail clippings, since they were double what they should have been when I got the bike).





Nice gouges on that one.









Hrm, yay for pits.

In short, my new XT could look a whole lot worse. I don't see any major gouging, scuffing, or wear (then again, maybe I'm the ray charles of motorcycle maintenance). However, bearings are perhaps much more sensitive than cam surfaces, so we'll see what turns up as I dig further (most likely tomorrow).
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  #7  
Old 28 Jul 2006
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(Again) nothing wrong
with camshaft / bearing surfaces. Used, yes, but don't worry. Note that the surfaces in the cover are almost new, as they are not loaded by the mechanism. It's the surfaces in the head itself that are loaded.

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