Exhaust Port
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Junior Member
Squid
Joined: Aug 2017
Posts: 1
Exhaust Port
Curious if anyone has a thought on this photo. Rear Cylinder with one exhaust valve cavity Black other side White. Checked valve adjustment last summer, within spec. Compression 155 PSI cold at about 250 RPM. Plug looked good. Bike runs good, just thought this was odd. Thanks in advance.
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MotoGP
Joined: Aug 2007
Posts: 5,942
From: Lake View Terrace, CA
Curious if anyone has a thought on this photo. Rear Cylinder with one exhaust valve cavity Black other side White. Checked valve adjustment last summer, within spec. Compression 155 PSI cold at about 250 RPM. Plug looked good. Bike runs good, just thought this was odd. Thanks in advance.
The reason for this is that it does look like only one valve is opening.
Senior Member
Superstock
Joined: Sep 2013
Posts: 460
From: Costa Mesa, CA
I've only torn into a couple of SHs and I've seen similar residue patterns in two that still had the PAIRS (air injection) one had an extremely clogged air filter (causing a rich condition) the other had a jet kit set up way to rich. Just a thought. One the pattern went away after de-PAIRing, the other I never saw again.
Senior Member
MotoGP
Joined: Jul 2007
Posts: 5,066
From: NYC
So based on that I would also check you choke fittings. They break super easily and if they do they will richen the circuit causing richness like CaryDG describes.
They are plastic and poorly made. You can fix them or replace them with brass Polaris unit.
They are plastic and poorly made. You can fix them or replace them with brass Polaris unit.
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SlowHAWK
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Oct 28, 2007 08:33 PM
