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FJR Motorcycle Forums
Technical & Mechanical Problems
Header temps,... any diagnostic value???
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<blockquote data-quote="jestal" data-source="post: 238958" data-attributes="member: 477"><p>Keep in mind that the FJR has a secondary AIR system.......sooo.....secondary combustion would not be rare, it is designed into the system.</p><p></p><p>I would hazard a guess that 1,2 & 3 are close enough for test repeatability. #4 is the out-lyer and might be worth a look at the plug for a guess on mis-fire or ??? With the AIR system it is hard to guess whether a pipe might be running cool or hot relative to rich/lean. It will depend on the operating conditions and whether the ECM is activating the AIR or not. The surest bet is that a misfire will usually cause it to run lower temp due to the volume of umburned mixture coming thru. AIR in a misfiring cylinder will cause the pipe to run cool (no "fire" to continue secondary combustion) but it will definitely raise the temp of the cat.</p></blockquote><p></p>
[QUOTE="jestal, post: 238958, member: 477"] Keep in mind that the FJR has a secondary AIR system.......sooo.....secondary combustion would not be rare, it is designed into the system. I would hazard a guess that 1,2 & 3 are close enough for test repeatability. #4 is the out-lyer and might be worth a look at the plug for a guess on mis-fire or ??? With the AIR system it is hard to guess whether a pipe might be running cool or hot relative to rich/lean. It will depend on the operating conditions and whether the ECM is activating the AIR or not. The surest bet is that a misfire will usually cause it to run lower temp due to the volume of umburned mixture coming thru. AIR in a misfiring cylinder will cause the pipe to run cool (no "fire" to continue secondary combustion) but it will definitely raise the temp of the cat. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Header temps,... any diagnostic value???
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