kopcicle
Full Member
"don't crush that dwarf , hand me the pliers "
Posts: 150
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Post by kopcicle on May 5, 2012 23:48:11 GMT -5
A '79 Yamaha XS650 2FO . I have modified the rear to accept the KZ750B LTD M1 twin 18" disc brake hub . At the moment the front is stock with he the exception of the second brake . The rear is modified only by way of spacers to center the disc in the caliper and turning down the drive hub center to accept more common KZ650 #530 sprockets . The disc itself is a Honda CB200C turned down .200" to fit inside the caliper . The bearings in the rear had to be changed to accept the Yamaha axle . I found a WM4 2.50" 40 hole rim attached to a Sportster hub and a WM3 2.15 19" 36 hole rim from some dirt bike for the front . Both rims are vintage Akront .The angle of the spoke holes is well within limits for adaptation to the Yamaha and Kawasaki hubs . All I have to do is polish replacement hubs and rims and deliver to the Wheelmaster . The engine is at present a stock bore XS650 with a 277/83 crank . All else other than a stock XS2 left cylinder decompression valve remains either stock Yamaha or modified Yamaha parts . That is the red bike as we know it at this time . ~kop
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Post by richard on May 7, 2012 18:00:55 GMT -5
That’s nice kopcicle. I too wanted the rear disk brake on my 82 project I only wish it had been a 2F0, but the price was right. I prefer the look spokes over mags and have been wondering if there were any older spoke front hubs that could be made to work. I have a couple of 36s, but the 40 seems like a much better option. I considered making my own rear hub, but the material alone is $150 for raw blank. I have been kind stuck gathering parts at this point and put off dealing with the rear. With the 277 re-phase that thing is sure going to be nice when it’s done. I plan on doing a stock bore and rephrase also, but since I’m not sure how you would balance the pressed crank I’m probably going to have that part done. Money seems to be the biggest limiting factor. Funny how a that always happens. So the rear caliper is off KZ650?
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kopcicle
Full Member
"don't crush that dwarf , hand me the pliers "
Posts: 150
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Post by kopcicle on May 7, 2012 21:00:24 GMT -5
The rear caliper is bone stock 2F0 . I was careful to leave as much of the conversion stock as possible . With the un-modified KZ750B LTD M1 twin 18" disc brake hub and rim the Honda disc centers in the caliper once .200" is taken off the diameter . Now one caution , the disc was "marked" CB200C but I did not take it off myself so I won't swear to it . I'm told that the KZ305 is very similar also so ya pays yer money and takes yer chances . I did turn down one side of the rear hub and I believe it was the sprocket side . I'll know more in a week or so . As the project stands the disc is centered in the caliper and the sprockets are so nearly in alignment that I may be able to let it go . I did have to futz with spacers for hours but it fits . I should say almost fits . I'll have to pull the wheel toward the drive side about .250" to put it on center line but with all else falling into place I'm far beyond complaining. I had considered the modification of the front hub to carry sprocket and disc but going without the dampener was more than I or the gearbox and transmission could tolerate .
~kop
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Post by richard on May 7, 2012 22:13:43 GMT -5
“ya pays yer money and takes yer chances” LOL! ain’t that the truth. Well it looks like you have pretty much got it other than a little shimming here and there. It looks great :-)
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