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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Have I been doing the seat lift mod wrong? /cgi-bin/YaBB.pl?num=1441568178 Message started by Tocsik on 09/06/15 at 12:36:17 |
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Title: Have I been doing the seat lift mod wrong? Post by Tocsik on 09/06/15 at 12:36:17 I had my seat and tank off for some tinkering and decided I wanted to raise the back of my tank to match the front of the seat since I had it lifted. I just moved my spacers from the top of the tank bracket to the bottom. Is this how you guys have done this and I just had it wrong? It took away the gap between the seat and tank and actually leveled the bottom edge of the tank with the top of the head which seems to look better. http://i1115.photobucket.com/albums/k548/Tocsik87/S40/spacers%20moved%20side%20by%20side_zps7veal0sg.jpg (http://s1115.photobucket.com/user/Tocsik87/media/S40/spacers%20moved%20side%20by%20side_zps7veal0sg.jpg.html) http://i1115.photobucket.com/albums/k548/Tocsik87/S40/spacers%20moved%20side%20by%20side2_zps45cgvcah.jpg (http://s1115.photobucket.com/user/Tocsik87/media/S40/spacers%20moved%20side%20by%20side2_zps45cgvcah.jpg.html) http://i1115.photobucket.com/albums/k548/Tocsik87/S40/IMG_20150906_125629918_zpso19w8lvc.jpg (http://s1115.photobucket.com/user/Tocsik87/media/S40/IMG_20150906_125629918_zpso19w8lvc.jpg.html) |
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Title: Re: Have I been doing the seat lift mod wrong? Post by KennyG on 09/06/15 at 13:25:25 Tocsik. The picture that you show with the spacers under the tank could give you a problem in the near future. The ears on the rear of the tank are weak and known to crack or break off with the tank mounted in the standard factory position. I am thinking with the spacers under the tank there is added stress on the ears. Maybe one of the engineers will pipe in with a better answer.. Kenny G |
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Title: Re: Have I been doing the seat lift mod wrong? Post by Tocsik on 09/06/15 at 13:45:09 well, dang. do they fail under the tank or on the strap? If they fail under the tank, does it tear the tank and cause a leak? |
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Title: Re: Have I been doing the seat lift mod wrong? Post by Serowbot on 09/06/15 at 13:57:39 As long as the rubbers are above and below the tank tab,... I don't think it matters... I wouldn't recommend leaning on the tank to get off the bike, or using it to lift the bike off the sidestand, etc... ...but, I wouldn't recommend doing that with the stock tank position either... IIRC, tanks have cracked at the attachment weld and leaked... I have 1" lift on the tank, and 2" on the seat... http://i600.photobucket.com/albums/tt82/serowbot/rerun/tanklift003.jpg |
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Title: Re: Have I been doing the seat lift mod wrong? Post by verslagen1 on 09/06/15 at 14:21:21 I'm a stress analysis by trade for aircraft ducting... you're making work on a weekend? [media]https://www.youtube.com/watch?v=hwm9DvF24Ag[/media] The stock tank is only supported by the dampers in front and rear. lifting the rear changes the angle by inv sine 1/~18 or 3° as we can see from your pic's the ears don't sit flat. This places a torsional load upon the bracket which countered by gravity. This is probably the worst kind of fatigue loading, a negative combined with a positive causing bending in either direction. How to fix this? bend the tab on the rear till it sits flat. |
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Title: Re: Have I been doing the seat lift mod wrong? Post by Tocsik on 09/07/15 at 07:08:27 There are steel sleeves inside the stock rubber bushings and when I have the tank bolts tight, the tank feels really solid. But I'm wondering if there shouldn't be a bit more wiggle to it if the rubber bushings are doing their job. Wonder if I should take out the steel sleeves or convert my chrome lifts to the rubber stoppers others have used. I took the seat off again this morning and bent the tank tab down a little (gently!) to create better alignment as Versy suggested. I sure don't want to create problems for my tank or mount points but I definitely like it lifted a bit. |
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Title: Re: Have I been doing the seat lift mod wrong? Post by justin_o_guy2 on 09/07/15 at 13:42:51 The tank is rotated up in the rear with the front mount as the pivot point. The rear mount WAS flat to the frame member with the bushing on it. Now the rear most point of that tab is higher than the front of the tab. Consider the geometry. Close your eyes and see it. If you bend the leg between tank and tab to get the angle right, then the center of the hole that the bushings are supposed to meet in will be moved forward. If you just bend the tab, well, it has been factory wrinkled to stiffen it, You can accept the torque on the tab that Versy explained and Rowboat has been running around for a long time just about the same way, or, taper the bushings, or add wedges, there are a buncha ways to solve the problem. It's a matter of ability to envision the problem and envision the potential ways to address it. |
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Title: Re: Have I been doing the seat lift mod wrong? Post by Kris01 on 09/07/15 at 19:15:52 697A6D6C737E787A712E1F0 wrote:
What'd he say?!? ;D |
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Title: Re: Have I been doing the seat lift mod wrong? Post by verslagen1 on 09/07/15 at 21:29:21 58617A602322130 wrote:
give it a smack and bob's your uncle. :-? |
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