Valve Diagnosis - ZX Forums
 
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post #1 of 8 (permalink) Old 07-06-2019, 10:44 AM Thread Starter
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Valve Diagnosis

Noticed this on exhaust port #4, while stock pipes off. Feedback?
Other ports nice ash grey , like on right side of pic.
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post #2 of 8 (permalink) Old 07-06-2019, 03:53 PM
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My guess is the enrichener needle on that cylinder's carb is not seating fully and you're getting an extra shot of raw fuel running through on that side.

It may be a pig, but it's a pig with a rocket in it's ass!
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post #3 of 8 (permalink) Old 07-06-2019, 05:28 PM Thread Starter
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Pic is on a 2007 ZX14. My profile a bit outta date.
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post #4 of 8 (permalink) Old 07-17-2019, 10:08 AM
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Pull the plug and see what that's like. The port looks a little wet...that means a a valve guide seal, most likely, is giving up the ghost and letting some oil past.

2012 ZX14R SE
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post #5 of 8 (permalink) Old 07-18-2019, 07:13 AM
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Possibly Oil sucked past gasket for Kleen air injection port .
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post #6 of 8 (permalink) Old 07-18-2019, 04:53 PM
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Quote:
Originally Posted by GpzRider View Post
Pic is on a 2007 ZX14. My profile a bit outta date.
Then I would say you have a valve running very hot. Low compression would affect both and not much chance of one going cold. Compression and leakdown test may tell you something.

Valve clearance has 2 functions; the first, everyone knows, which is to assure the valve closes completely to facilitate compression.

The second is to cool the valve. The amount of clearance (duration from contact to contact of the cam lobe) determines the amount of time the valve spends on the seat. Too short a duration, no chance to transfer heat. Too much duration and heat
actually passes back into the valve seat and the valve head.

It may be a pig, but it's a pig with a rocket in it's ass!

Last edited by Hammerhead; 07-18-2019 at 04:58 PM.
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post #7 of 8 (permalink) Old 07-21-2019, 04:13 PM
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Other than clearance, the number one cause of burnt exhaust valves is a sacked out valve spring. There is surprisingly little seat pressure on these bikes, like 28 pounds or so, so, ther isn't much margin for error if one starts to get soft.
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post #8 of 8 (permalink) Old 07-23-2019, 06:53 AM Thread Starter
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Thanks all

Plugs looked ok when I got the bike. Factory with larger work gap. Colour tan.
Will do a compression test.
Guess the only solution is surgery. Head removal, inspection, valve job.
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