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Post by colinjay on Apr 12, 2007 23:31:09 GMT -5
Hi all, As mentioned in a previous post, I have been looking and not only found my drawings of the 4 piston caliper mount and disc spacers, but even managed to scan then into a JPEG format. So, here they are; 1. Mounting bracket to fit a 4 piston Yamaha to the SR fork leg. 2. Disc spacer to fit a Yamaha 320mm floating disc (XJ1200/TZR250 etc) onto a SR front Mag wheel 3. Disc spacer to fit a Yamaha 320mm floating disc (XJ1200/TZR250 etc) onto a early RD250/XS650 wire wheel When I have made these bits, I have always made them from 5083 High strength structural aluminium alloy plate. Other alloys may work, but for the small cost of the material required, use the highest grade that you can find. DISCLAIMER. I take no responcebility for an inaccuracies in these drawings, so if they don't fit don't blame me! I will also not take any responcebility, if they fit, and for some reason you have an accident resulting from modifing the brakes on your bike. If this happens, be a man and take responcebility for you own actions. COPYRIGHT NOTICE I have no problem with people making these components for their own use, however if I find someone has started producing copies of these parts for commercial gain, I will send the "Boys" around to show you the errors of your ways! Also in the best of American tradition I will sue your ass off! CJ
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Post by StewRoss on Apr 13, 2007 2:41:35 GMT -5
Well done mate. I do the same types of drawings for all my stuff. I have just been working on a caliper bracket for my new cafe racer...it takes the calipers 15mm out laterally to enable the caliper to clear the spokes on the inside and 17mm radially for the 330mm disc...I am looking forward to making it. I took the angle between the axle centre/fork centreline and the original holes and then I transposed them further out so that the caliper stayed in the same relative position to the disc but further out...thinking about it though perhaps I have to back the angles off a little due to a larger diameter disc...what do you reckon??? Nice job anyway. SR
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Post by colinjay on Apr 13, 2007 3:08:40 GMT -5
Hi Stew, The design process I used for these part is not very scientific. I subscribe to the ancient Zen design philosophy of "If it look right, it is right!" I made the first few mock-up caliper brackets from thin plywood to get the caliper into the positon that I wanted in relation to the forkleg, while the playing with the spacing of the disc on the wheel with flat washers. Once everthing was in a position that looked ok, I then made a 3mm aluminium mock-up of the caliper bracket to do the final checks before hand cutting the final bracket from 5083 plate. The same thing basically happened with the spacers for the discs, where once I hade the distance that the disc had to be spaced out, I made a couple of trial spacers from mild steel to get all the dimension correct before making the final aluminium spacer. Final result is below; CJ
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Post by StewRoss on Apr 13, 2007 4:13:33 GMT -5
Hi, Yes that is a good way for sure...I have used that method many times on rearset plates etc. I am making mine on my mill so I need to have a fairly detailed and accurate drawing otherwise it won't work. I would definitely do mine the same way if it was on the same plane but the bracket has to have a decent step in it so I am trying to do it more 'scientifically' as you say. I'll post the result...(after I have made one that looks OK of course)...heh, heh... SR
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Post by aero on Apr 13, 2007 4:41:44 GMT -5
Great, thanks for that!
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Post by fenz on Apr 13, 2007 6:25:15 GMT -5
Hi CJ I notice from your photo that your disc is mounted on the other side of the fork to the standard SR.
Are your forks off something like a XS250?? The only reason i am asking is that the track bike i am building also has the caliper mount on this side and are undecided on what to do for brakes.
Does it effect the handling of the bike at all by having the brakes on both side of the bike???
By the way love your disclaimer and copyright keep up the good work.
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Post by fenz on Apr 13, 2007 18:19:37 GMT -5
Oh...forgot the SR has a mount both sides....Still interested how it corners corners under brakes though.
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Post by StewRoss on Apr 14, 2007 2:41:00 GMT -5
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Post by colinjay on Apr 15, 2007 17:20:57 GMT -5
Hi Fenz,
The forks are std 1978 SR forks. I mounted the disc on the RH side as I found when I tried to space the disc on the LH side it fouled on the speedo drive. If you remove the speedo drive drive unit you can fit disc on the LH side, but since I wanted to keep it the disc went onto the RH side.
CJ
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Post by fenz on Apr 15, 2007 23:18:35 GMT -5
I am thinking that the forks on my bike are from an xs250 as the caliper mounts on the right leg(no mount on left side). The dia. and the length is the same as the sr but the mounting point is different.From memory i think that the xs had a smaller disc too.
I will start another thread and post some pics up to see if someone can identify exactly what they are.
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Post by davedunsboro on Apr 16, 2007 8:10:53 GMT -5
Fenz if you need some 500 forks I've got 2 sets . 1 set is quite reasonable other is just OK , name your price & they're yours . At least you reside in OZ so let me know cheers Dave.
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Post by fenz on Apr 16, 2007 16:09:15 GMT -5
Thanks mate i will keep you in mind.
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