Where's the carbon from?

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07 May 2016 17:31 #725110 by VTEC
Replied by VTEC on topic Where's the carbon from?
Let me ask you guys this one?

Had the carbs off way too many times tuning, and whenever I looked in the port I would see droplets hanging from the guides, after normal riding. Is that normal to have fuel droplets there, or was it oil from around the guides. It stuck around for a long time. Would have thought it would have evaporated on a hot engine if it was fuel.
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  • SWest
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07 May 2016 17:39 #725112 by SWest
Replied by SWest on topic Where's the carbon from?
Could be getting past the guides in the head. Might have to go oversized and make sure the bores are clean. (no burrs)
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kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
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07 May 2016 17:40 #725113 by VTEC
Replied by VTEC on topic Where's the carbon from?

swest wrote: Could be getting past the guides in the head. Might have to go oversized and make sure the bores are clean. (no burrs)


Yeah, I'm gonna figure out a good way to pressure test around the guides to confirm.
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07 May 2016 17:49 #725115 by SWest
Replied by SWest on topic Where's the carbon from?
Were they replaced? Easy to pull out metal when doing it.
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
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07 May 2016 17:56 #725117 by VTEC
Replied by VTEC on topic Where's the carbon from?
Yes, APE bronze with the oversized valves. I understand you can score the bore and cause leaks if you don't clean the original guide real good before knocking it out.
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07 May 2016 18:20 #725122 by SWest
Replied by SWest on topic Where's the carbon from?
I did mine in 87. One came out with metal on it. It happens.
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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08 May 2016 08:53 #725181 by Nessism
Replied by Nessism on topic Where's the carbon from?
Build up of carbon on the back side of the valves is perfectly normal and nothing to worry about. If the engine is running well and not burning oil then you don't have a problem.
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0

www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know

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08 May 2016 14:49 #725223 by VTEC
Replied by VTEC on topic Where's the carbon from?

Nessism wrote: Build up of carbon on the back side of the valves is perfectly normal and nothing to worry about. If the engine is running well and not burning oil then you don't have a problem.


This happened immediately after running a new engine. I think there was oil consumption, and the carbon was enough to kill a piston. The guides being the source also doesn't make sense because there was no blue smoke on start up, but oil got dark quick, like a blow-by issue.
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08 May 2016 16:03 #725225 by Street Fighter LTD
Replied by Street Fighter LTD on topic Where's the carbon from?
Perhaps before the rings were seated

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08 May 2016 17:17 #725233 by SWest
Replied by SWest on topic Where's the carbon from?
Most likely seals. A little oil won't cause smoke.
Steve
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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