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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Thumb/cable decompression lever? /cgi-bin/YaBB.pl?num=1474243648 Message started by Armen on 09/18/16 at 17:07:27 |
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Title: Thumb/cable decompression lever? Post by Armen on 09/18/16 at 17:07:27 A few of the big singles out there use a compression release with a thumb lever on the handlebar. I've ditched the whole decompression gizmo. Not crazy about the foot operated. Kinda thinking there will be times that I can't take my left hand of the bar and reach down to the RYCA type lever on the side of the head. Wondering if anyone did a handlebar mounted decomp lever? What goodies did you use? thanks, -Armen |
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Title: Re: Thumb/cable decompression lever? Post by verslagen1 on 09/18/16 at 17:46:24 Dave had a couple decomp lever kits for sale, but I think they're all gone. At least I didn't find the listing in the marketplace. Maybe he'll post what they were composed of. |
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Title: Re: Thumb/cable decompression lever? Post by Dave on 09/19/16 at 03:51:35 I made one for my bike, then one winter I made a few sets and sold them. With your skill/tools you won't have any trouble making one. I used a BMX left brake lever, the stock clamp size is 7/8" for my clip-ons, and I bored the clamp out to 1" for the stock bars. I had to lengthen the decompression lever on the head to allow more travel and leverage. I also had to modify the cable mount on the head to match the longer lever. I bought stainless bicycle cable inner/outer to make the longer cable, and machined brass ends to solder to the cable. The only really tricky part was learning how to solder to the Teflon coated stainless cable - you need to sand/scrape the cable end to get the Teflon off, then put some liquid acid flux on the cable end. Then....the cable is so small it is easy to overheat it while trying to use a torch - it is much easier to use a small piece of steel clamped in a vice, and melt the solder on the steel and dip the cable end in the molten solder to tin it. Once that is done it is easy to heat the cable and brass fitting to solder them together. Here is the text/photos copied from my Bike Build. I went to the local bicycle store and bought a left brake lever for a BMX bike. The length of pull is far more than the compression release and I was worried about being strong enough to pull the lever....or breaking the cable.....so I made a longer decompression lever that would match the distance between the pivot point and cable on the lever. I had to make a new mount that would put the cable in line with the new lever. The new parts are painted black. http://i40.tinypic.com/et5g87.jpg I then mounted them on the engine and I use a bicycle brake cable that I cut to length and soldered on a proper end fitting. http://i43.tinypic.com/11m6sjl.jpg I then mounted the new bicycle brake lever on my clip ons. I had to angle the lever up a bit - so it did not hit the passing light switch when I pulled it in. http://i39.tinypic.com/2i8cepk.jpg http://i42.tinypic.com/2vbwnj7.jpg It seems to work proper now. I have enough leverage to pull the exhaust valves open with my fingers. With your skill/tools you won't have any trouble making one. |
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Title: Re: Thumb/cable decompression lever? Post by justin_o_guy2 on 09/19/16 at 05:56:59 None of my drill bits will poke a hole with the flat spots. |
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Title: Re: Thumb/cable decompression lever? Post by Dave on 09/19/16 at 06:41:03 091610170A0D3C0C3C04161A51630 wrote:
On that black arm shown in the photo....I cut it out of sheet metal, bent it to shape, and drilled a round hole and filed it to the shape with the flat spots. On the kits, I bought 2 levers and cut them apart with a long stem on each half, and welded them back together with a longer throw on the arm. On the kits....I also added a coil spring over the decompression end to help push the lever down to the rest position. |
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Title: Re: Thumb/cable decompression lever? Post by stewmills on 09/19/16 at 07:35:54 435C5A5D40477646764E5C501B290 wrote:
This will: https://www.youtube.com/watch?v=rjckF0-VeGI |
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Title: Re: Thumb/cable decompression lever? Post by justin_o_guy2 on 09/19/16 at 08:27:47 My momma says anything that will drill a square hole is of the Devil. Howcum it doesn't mangle the plate with the square hole? I wonder what spending a day with the guy who came up with that would be like.. |
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Title: Re: Thumb/cable decompression lever? Post by Dave on 09/19/16 at 08:44:23 The hole needed is not square....it is has two flat spots....with rounded ends. |
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Title: Re: Thumb/cable decompression lever? Post by LANCER on 09/19/16 at 08:48:00 I found a lever on eBay; it was 7/8 so drilled and then used a barrel shaped sander on it; got a Barnett cable for it. Works fine. |
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Title: Re: Thumb/cable decompression lever? Post by Armen on 09/20/16 at 01:58:01 Thanks! |
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Title: Re: Thumb/cable decompression lever? Post by SavageMan99 on 09/20/16 at 08:50:41 Brownells gunsmithing supply sells THE BEST solder and flux. High force 44 solder and the flux for it is called Comet flux. The flux is the best I've ever found for putting parts together, plumbing and electric. The solder flows at a decent temp and holds very well. I've gotten spoiled and use the flux for everything, the solder for joing parts. |
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Title: Re: Thumb/cable decompression lever? Post by SavageMan99 on 09/20/16 at 08:54:46 You can drill a square hole. Takes a special bit and a fixture. Usually square holes are punched, or filed by smucks like us. Jewelers files from horror freight are good enough. Or, if your a vintage tool junkie like me, a Harvey die filer and a full set of unused files you found in a basement for 50 bucks! :) |
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Title: Re: Thumb/cable decompression lever? Post by justin_o_guy2 on 09/20/16 at 09:06:56 5F4046415C5B6A5A6A52404C07350 wrote:
I really didn't see a square hole. The easy fix is a mill in a drill press and a vise that tavels. Or, carefully spaced drilled holes, and a file. |
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Title: Re: Thumb/cable decompression lever? Post by Armen on 09/21/16 at 11:39:37 Nice work! |
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Title: Re: Thumb/cable decompression lever? Post by shadowfocus603 on 09/21/16 at 11:59:36 584741465B5C6D5D6D55474B00320 wrote:
I really didn't see a square hole. The easy fix is a mill in a drill press and a vise that tavels. Or, carefully spaced drilled holes, and a file. [/quote] I was thinking two holes and a file myself. |
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Title: Re: Thumb/cable decompression lever? Post by justin_o_guy2 on 09/21/16 at 12:49:03 Which is how Dave described doing it. |
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Title: Re: Thumb/cable decompression lever? Post by Dave on 09/21/16 at 13:41:59 2D3234332E2918281820323E75470 wrote:
No...one hole and then file. The rounded ends of the curve are not complete circles. The decompression shaft was round, and then then they machined two flat spots. The hole in the lever has to match that, as shown by the shaded section below. I drill one hole, then begin filing.,....if I try drilling 2 smaller holes, I always end up screwing the thing up when the drill bit intersects the edge of the first hole and the drill snags. In this thin sheet metal the Uni-bit stepped drills don't catch and deform the piece. |
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Title: Re: Thumb/cable decompression lever? Post by justin_o_guy2 on 09/21/16 at 13:44:56 Well, now That's cleared up. |
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Title: Re: Thumb/cable decompression lever? Post by verslagen1 on 09/21/16 at 13:57:04 Just drill a hole, grab a hammer and pound on it till it fits. Then grab your welder and make it permanent. case closed, finito, al fin. |
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