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Post by tomlory on Jul 7, 2022 6:39:26 GMT
I'm back on track with a makeshift conversion of my G27 shifter to a self-centering sequential shifter with a rubber bands looped around the shifter boot ring @ 0 and 180 degrees with each pulling on the shifter. I disassembled my Logi G27 shifter to see how it works which involved some cursing when it sprang apart, ejected the detent ball and unhooked the expansion spring that holds the bottom halves together and even more bleep-worthy words putting the mousetrap back together. I could have fabricated internal plates or an external one to keep the shifter in the 3-4 slot but happily the solution to center the shifter between 3 and 4 also keeps it in the 3-4 slot. My shifter boot was already tattered so removing it and its plastic spacer to make my version of the rubber band mod work wasn't a loss. I could have simply cut the boot spacer off but how to remove the shift knob wasn't obvious to me (maybe a nut under the shift pattern insert?) so I removed the shift lever. It's going to take some getting used to but it seems like it's going to get me by until the new equipment that I want is readily available. The H shifter has been used less than any of my controls so it should further from end of life.
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Post by tomlory on Jul 23, 2022 3:42:57 GMT
The rubber bands in the 1st try failed pretty quickly due to being pinched between sharp edges. 3rd and hopefully final solution. Not visible on the bottom is a vacuum cleaner driver belt hooked on the table clamp in a similar manner to the large black O-ring on top. The blue rubber band is active for its entire circumference which I believe is ideal for longevity. The purple one is trapped against the shifter assembly body so only a short segment is active. These are the last of the rubber bands that I could scrounge up at home so I'm feeling lucky that they just happened to work. I also found that the shift pattern insert snaps into the shift ball. Removing the insert reveals a Philips screw that secures the ball to the shift lever. The shift boot ring is secured with small socket head cap screws.
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Post by mikec1 on Jul 23, 2022 4:48:04 GMT
As long as it works Tom. I should've taken a pic of my shifter with the rubber bands. I had at least 8-10 pulling on all 4 sides. Looked like shit but it worked.
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Post by tomlory on Aug 25, 2022 3:04:57 GMT
The rubber bands have been prone to failure, especially the one that pulls the shifter towards the driver, I believe because the rubber band abrades itself and also because less than 1/2 of its length is active. Here's what I'm running now. The vacuum cleaner brush belt simply limits the shifter travel forward, requires a realistic amount of force to make a downshift and is unlikely to fail. The conduit can be moved without tools to change the tension. The rubber band has a much easier life now, does not need to be matched to another rubber band so if it breaks I should be able to grab any one and be back on track in 30 seconds.
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Post by tomlory on Sept 14, 2022 23:16:16 GMT
Down to my last spare rubber band, I foraged through the garage for a solution to find a motorcycle innertube that would have needed two patches to fix, after which I wouldn't trust it in my street ridden DRZ400SM supermoto so that will instead be recycled into countless rubber bands. The office grade rubber bands were failing for probably two reasons: rubbing and stretched too close to 100% when upshifting. I went through two or three one week. The inner tube band won't rub on itself. It's stretched substantially but is obviously much stronger. I haven't done any laps with it yet. Upshifts will require more force but can be tuned to less or equal of the force required for downshifts. Hopefully 4th and final version:
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Post by mikec1 on Sept 15, 2022 9:49:48 GMT
Somebody get this man a loto ticket!
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Post by tomlory on Sept 15, 2022 20:46:26 GMT
Yes, winning one, please. Stretching my resources ...
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