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FJR Motorcycle Forums
Technical & Mechanical Problems
Header temps,... any diagnostic value???
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<blockquote data-quote="DonRed7" data-source="post: 238029" data-attributes="member: 4252"><p>For the last week or so cold starts are not having the motor sound as smooth and it will seem as though the bike either misses a cylinder once or twice (engine stumbles i guess is the best description). Also the level of bar vibration has been increasing to the point where today for the first time i realized that my right hand was numb....So after a 45 min spin this morning i checked the header temps (bike still running, up on center stand) pointing my infra-red thermometer at each of the four headers and was suprised at the differences.</p><p></p><p>Cyl #1 = 81/82 deg C</p><p></p><p>Cyl #2 = 81/82 deg C</p><p></p><p>Cyl #3 = 90/91 deg C</p><p></p><p>Cyl #4 = 65/66 deg C</p><p></p><p>This was not just a quick click of the meter,...I did each pipe 5 or 6 times and from both sides or the bike,....(And,.... Yes i know IR Temp units are sensitive to surface finishes) and consistently got the above #'s.</p><p></p><p>Anyhoo,....Is this telling me that i'm having cyl's 3 and 4 running rich/lean?, and does a lean cylinder/pipe typically run hotter or cooler?</p><p></p><p>I also did this to each pipe at cold start up and my main observation was that cylinder/header #4 was warming up 10 to 15 degrees cooler than the other 3 pipes.</p><p></p><p>Any ideas?????</p><p></p><p>Cheers</p><p></p><p>-Don</p></blockquote><p></p>
[QUOTE="DonRed7, post: 238029, member: 4252"] For the last week or so cold starts are not having the motor sound as smooth and it will seem as though the bike either misses a cylinder once or twice (engine stumbles i guess is the best description). Also the level of bar vibration has been increasing to the point where today for the first time i realized that my right hand was numb....So after a 45 min spin this morning i checked the header temps (bike still running, up on center stand) pointing my infra-red thermometer at each of the four headers and was suprised at the differences. Cyl #1 = 81/82 deg C Cyl #2 = 81/82 deg C Cyl #3 = 90/91 deg C Cyl #4 = 65/66 deg C This was not just a quick click of the meter,...I did each pipe 5 or 6 times and from both sides or the bike,....(And,.... Yes i know IR Temp units are sensitive to surface finishes) and consistently got the above #'s. Anyhoo,....Is this telling me that i'm having cyl's 3 and 4 running rich/lean?, and does a lean cylinder/pipe typically run hotter or cooler? I also did this to each pipe at cold start up and my main observation was that cylinder/header #4 was warming up 10 to 15 degrees cooler than the other 3 pipes. Any ideas????? Cheers -Don [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Header temps,... any diagnostic value???
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