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1975 RD350 brake upgrade
http://www.kawi2strokes.com/forum/viewtopic.php?f=11&t=13193		 Page 1 of 2
Author:  Tim Steele [ Wed Nov 29, 2017 4:14 pm ]
Post subject:  1975 RD350 brake upgrade
I am spoiled by the 2 finger stopping abilities of the Phoenix Project and the RZ 350 and I had the R1 adapter bracket laying in the Girly Bike parts pile since the Gap when the Haase gave it to me.
So about a week ago I started gathering the required pieces from good ol Flea Bay...
ImageR1 front brake setup complete with Goodrich braided lines and new race pads $99 shipped. The conversion also required an FZR 600 rotor, a 12MM spacer ( made by cutting what the Haase referred to as a hat, from the center of a factory disc) and 6 M8 x 40 MM bolts, and some M8 and M10 washers for spacing.
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Author:  Tim Steele [ Wed Nov 29, 2017 4:18 pm ]
Post subject:  Re: 1975 RD350 brake upgrade
Image

I had some issues (self induced) with the spacer made from the hat. I had to take it all back apart. and it took some time facing the spacer and now the rotor has no discernable runout. On to spacing....
Author:  Tim Steele [ Wed Nov 29, 2017 4:21 pm ]
Post subject:  Re: 1975 RD350 brake upgrade
Image

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This morning I worked out the spacing issues and assembled the rest of the system. I also had to grind a little off the caliper for spoke clearence. The R1 system operates the two lines with a double banjo bolt so I looked through my parts and found a decent single banjo and luckily the goodrich braided line is the perfect length. I hooked up my mityvac and bled the brake. Then I made a small subharness to plug into the factory pressure switch wiring so the brake light would work. Then I took a vigorous test ride and am pleased to report that despite the piston orientaion being incorrect big vs small leading that I can haul it down from 90 MPH with two fingers. The feel is good and the braking is linear and progressive. The only drawback is the RH forward fender brace will not work so I am on the hunt for a RD 400 or XS 400 front fender. Big thanks go out to M in SC for the bracket adapter and the help figuring out the spacing...
The rotor was $29 shipped for two and the bolts were $17 shipped. The whole mod is easily reversible as everything is bolt on and the original wiring for the no longer used pressure switch is untouched.
Author:  H2RTuner [ Wed Nov 29, 2017 4:26 pm ]
Post subject:  Re: 1975 RD350 brake upgrade
Absolute beauty, sir.

I am not one of those that thinks brakes only need to be one disk on the front, no matter the calipoer used, I like the two, or single finger braking, and as much brake as I can add to the front wheel. Dual disks forever, and as many pistons in the calipers as I can get to sweep the disk correctly, FULLY, both sides.
Author:  Tim Steele [ Wed Nov 29, 2017 4:31 pm ]
Post subject:  Re: 1975 RD350 brake upgrade
I would have done duals on this one too if I had a dual disc capable hub, but as light as the RD is it a night and day difference with the bigger rotor and 4 piston R1 caliper...
Author:  Jim [ Wed Nov 29, 2017 4:54 pm ]
Post subject:  Re: 1975 RD350 brake upgrade
Just curious... is there a reason the caliper is in front of the fork tube? Like maybe the mounting eyes aren't in the right place if you flip the slider?
Author:  Tim Steele [ Wed Nov 29, 2017 5:10 pm ]
Post subject:  Re: 1975 RD350 brake upgrade
Speedo wont work if you flip the legs...
Author:  Jim [ Wed Nov 29, 2017 5:15 pm ]
Post subject:  Re: 1975 RD350 brake upgrade
Oh, huh. Interesting, thanks.
Author:  Tim Steele [ Wed Nov 29, 2017 5:23 pm ]
Post subject:  Re: 1975 RD350 brake upgrade
Mark told me I could use my other caliper and go with an RD 400 fork lower as another option or use a speedo drive reverser... but this is working really well so far...
Author:  Jim [ Wed Nov 29, 2017 7:25 pm ]
Post subject:  Re: 1975 RD350 brake upgrade
I'm sure it is. Having the caliper behind the fork tube is really more of a psychological improvement than a real one. :)
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