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FJR Motorcycle Forums
Technical & Mechanical Problems
'Unauthorized' TB synch
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<blockquote data-quote="Fred W" data-source="post: 590577" data-attributes="member: 3828"><p>Sorry to dredge up such an ancient topic, but ELP_JC raised a question here that was never answered or addressed, and deserves a second look IMO.</p><p></p><p>My guess is that the CO settings are different due to intake manifold design or some such. So even with perfectly syncronized butterflies the CO still needs to be different. The only twist is that the newest 2nd gens, which have basically the same engine and intake, come programmed with even CO numbers (10, 10, 10, 10, as I recall).</p><p></p><p>Either way, both the air screw and the CO settings should have the biggest effect at idle, with diminishing effect as the throttle is opened further. Most likely this was a way for Yamaha to meet their emissions specs at idle and has little effect on engine smoothness at off idle.</p><p></p><p>So maybe setting them all the same will make the bike <em>slightly</em> smoother at the cost of greater emissions? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite24" alt=":unsure:" title="Unsure :unsure:" loading="lazy" data-shortname=":unsure:" /> </p><p></p><p>Thoughts?</p></blockquote><p></p>
[QUOTE="Fred W, post: 590577, member: 3828"] Sorry to dredge up such an ancient topic, but ELP_JC raised a question here that was never answered or addressed, and deserves a second look IMO. My guess is that the CO settings are different due to intake manifold design or some such. So even with perfectly syncronized butterflies the CO still needs to be different. The only twist is that the newest 2nd gens, which have basically the same engine and intake, come programmed with even CO numbers (10, 10, 10, 10, as I recall). Either way, both the air screw and the CO settings should have the biggest effect at idle, with diminishing effect as the throttle is opened further. Most likely this was a way for Yamaha to meet their emissions specs at idle and has little effect on engine smoothness at off idle. So maybe setting them all the same will make the bike [I]slightly[/I] smoother at the cost of greater emissions? :unsure: Thoughts? [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
'Unauthorized' TB synch
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