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FJR Motorcycle Forums
Technical & Mechanical Problems
Lumpy Idle
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<blockquote data-quote="Fred W" data-source="post: 1397703" data-attributes="member: 3828"><p>I have noticed this to varying degrees on other FJRs. My 2005 did it quite a bit if idle was set up to 1100 rpm, which is where I mostly kept it. I attribute the variation to lean stumble as the idle fueling is set lean from the factory, and if the O2 sensor is still installed, the closed loop ensures the fuel ratio is lean.</p><p></p><p>Fooling around with it I noticed I could make it smoother by lowering the idle to exactly 1000 rpm, but did not like to leave it there as it made the throttle snatch worse. Tried to get rid of it, but eventually I just lived with it.</p><p></p><p>Interestingly, my 2014 has a very smooth idle with very little variation. I have no control over the idle speed as that is set by the ECU and fly-by-wire throttle. Maybe they did a better job on the 3rd Gen fuel map at idle?</p></blockquote><p></p>
[QUOTE="Fred W, post: 1397703, member: 3828"] I have noticed this to varying degrees on other FJRs. My 2005 did it quite a bit if idle was set up to 1100 rpm, which is where I mostly kept it. I attribute the variation to lean stumble as the idle fueling is set lean from the factory, and if the O2 sensor is still installed, the closed loop ensures the fuel ratio is lean. Fooling around with it I noticed I could make it smoother by lowering the idle to exactly 1000 rpm, but did not like to leave it there as it made the throttle snatch worse. Tried to get rid of it, but eventually I just lived with it. Interestingly, my 2014 has a very smooth idle with very little variation. I have no control over the idle speed as that is set by the ECU and fly-by-wire throttle. Maybe they did a better job on the 3rd Gen fuel map at idle? [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Lumpy Idle
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