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FJR Motorcycle Forums
Technical & Mechanical Problems
Hard down shifting...clutch circuit issue?
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<blockquote data-quote="eflyguy" data-source="post: 1314897" data-attributes="member: 27636"><p>I've followed this but not too closely, so this may have been covered.. I'm also no expert, so this is just my $0.02.. (/disclaimer)</p><p></p><p>.. but given what you just said, it sounds unrelated to the actual shift mechanism and definitely related to the clutch.</p><p></p><p>Here's why I think so - I clutchless shift a great deal, and do it by pre-loading the shift lever before blipping the throttle (closing slightly on up-shift, more throttle slightly on down-shift).</p><p></p><p>What's happening is the "load" on the gears due to the force of the engine driving the wheels, or the force of the wheel decelerating the engine, "locks" them in-place. As you adjust the RPM, that friction is released momentarily and the gears will slip into place.</p><p></p><p>Here's the key part - you can feel the release of pressure through the shift lever on your foot. There is resistance and then there is none. It takes a little effort to learn how much pressure to apply, because too much can force the change before the RPMs are correct, and the shift is not smooth. When you get it right, though, it's awfully gratifying.</p><p></p><p>So if holding the clutch in, or pulling it twice, releases that pressure, it *has* to be related to the engagement of the wheels to the engine - which in normal shifting, means the clutch is not disengaging.</p><p></p><p>Now this is contrary to what you say about the wheel not rotating with the clutch pulled with the bike on the center stand, or (iirc) only happening in certain gears. On that, I have nothing..</p></blockquote><p></p>
[QUOTE="eflyguy, post: 1314897, member: 27636"] I've followed this but not too closely, so this may have been covered.. I'm also no expert, so this is just my $0.02.. (/disclaimer) .. but given what you just said, it sounds unrelated to the actual shift mechanism and definitely related to the clutch. Here's why I think so - I clutchless shift a great deal, and do it by pre-loading the shift lever before blipping the throttle (closing slightly on up-shift, more throttle slightly on down-shift). What's happening is the "load" on the gears due to the force of the engine driving the wheels, or the force of the wheel decelerating the engine, "locks" them in-place. As you adjust the RPM, that friction is released momentarily and the gears will slip into place. Here's the key part - you can feel the release of pressure through the shift lever on your foot. There is resistance and then there is none. It takes a little effort to learn how much pressure to apply, because too much can force the change before the RPMs are correct, and the shift is not smooth. When you get it right, though, it's awfully gratifying. So if holding the clutch in, or pulling it twice, releases that pressure, it *has* to be related to the engagement of the wheels to the engine - which in normal shifting, means the clutch is not disengaging. Now this is contrary to what you say about the wheel not rotating with the clutch pulled with the bike on the center stand, or (iirc) only happening in certain gears. On that, I have nothing.. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Hard down shifting...clutch circuit issue?
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