motoshrump Posted March 18, 2013 Share Posted March 18, 2013 After 14+ years of being on the XX I decided to remove the header and have it glass beaded & repainted. Upon removal I felt obligated to check out the exhaust ports and to my amazement the carbon laid down on the surface of the ports has managed to produce an interesting pattern. On each cylinder there is one exhaust valve port that has a typical amount of carbon (no scale) while the other has absolutely no signs of carbon what so ever. I couldn't have cleaned it better with a sand blaster, a clean bright cast aluminum is all that I can see. The exhaust ports have a fine ridge cast pretty much right down the middle of the port and that produced the defined line between the carboned side and the clean side. The pattern is mirrored between the four cylinders so unless I have cam lobes wore off of all four I don't know how this is possible. The bike has a Dynojet Stage II jet kit with a BMI air filter and stock exhaust. I have had no issues with throttle response/jetting and the bike has only 40,000km. I run the Iridium NGK's & Honda GN4 10W40. Oil consumption is minimal. Has anyone ever seen this before? I can provide a picture if necessary. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
HANKSXXX Posted March 18, 2013 Share Posted March 18, 2013 I'd like to see the pictures... Quote Link to comment Share on other sites More sharing options...
The Krypt Keeper Posted March 18, 2013 Share Posted March 18, 2013 i would also like to see the pictures. don't know what its from, but i enjoy seeing weird stuff. Quote Link to comment Share on other sites More sharing options...
motoshrump Posted March 19, 2013 Author Share Posted March 19, 2013 I uploaded a couple of pics, not the best resolution but it gets the point across. And no that is not a shadow in the exhaust port. They are both under my only Album. Let me know what you think, Thanks. Here is the other one. Quote Link to comment Share on other sites More sharing options...
TuffguyF4i Posted March 26, 2013 Share Posted March 26, 2013 All i can say is that mass flow is a weird thing. In the engineering world, many times things are designed and tested many times before a final design is completed. This is because things are difficult to predict. Quote Link to comment Share on other sites More sharing options...
cbrxxquad Posted April 1, 2013 Share Posted April 1, 2013 too rich I am thinking. Quote Link to comment Share on other sites More sharing options...
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