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Old 06-03-2017, 10:08 PM   #1
fine69
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Default Desirable YZ front hub for swap

I remember reading about a YZ hub or maybe the whole wheel swap to enhance front braking on the 250cc. Seems it had two points to pull the shoes. Was it an 82 or so model?
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Old 06-03-2017, 10:33 PM   #2
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Yeah, you're on the right track. 81 or 82 they started using a double pull brake plate up until 85 or 86 when everyone in the bike industry leaned towards disks. The conical hubs from as early as 73? (74 for sure) on the YZ/MX are compatible with the DLS brake backing plate.

Sometimes they go for a hefty sum, last one I bought was about $75 and have seen some as high as $150.
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Old 06-03-2017, 10:36 PM   #3
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P1050228 by Ian Jorgensen, on Flickr
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Old 06-04-2017, 11:16 AM   #4
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May not fit,but the Rd125/200 have similar DLS setup on front for better breaking,as these little bikes got a lot of speed for a little bike.
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Old 06-05-2017, 03:35 PM   #5
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The DLS 45 degree lug slot backing plate was first used on the 80 YZ465G. Didn't show up on the 250 until 82. 83 revised to 90 degree lug slot and alloy arms (as seen in Jan's picture). The 125 I think didn't get the DLS till 84. The ITs got them as well approximately the same timeline. 84 was the last of the front drums. The conical hub first seen on the DT2-MX was the same deal from 72-82. The 83 had the same dimension but used a different casting process. 84s had a Z spoke front hub, but used the same backing plate from 83.

Fine 69? What 250 are you referring to?
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Old 06-05-2017, 05:47 PM   #6
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Fine 69? What 250 are you referring to?


I was thinking 73 and earlier. That is where my interest is. Just never liked the pass thru pipe and plastic fenders. Ian I remember looking at them before and they were !

So the part that slides into the forks will have to be right. So and 83 might be best bet?
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Old 06-06-2017, 12:56 PM   #7
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I'll be curious to see where this goes- I swapped out the front wheel on my RT2 with a later conical hub and 21" rim in order to improve braking- also to get a21" wheel- and while it was a near direct bolt-on it didn't make a huge difference in braking. It was BETTER, but is still not terribly good. I have since arced the shoes and done more fiddling, but I think at this point the system is as good as its going to get.

Link to my swap:

http://www.yamahaenduro.com/showthre...t=30188&page=2
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Old 06-06-2017, 07:28 PM   #8
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I am thinking that dropping a $100 0n a backing plate would be better spent on a disc setup. The disc thread might be where the action is.
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Old 06-06-2017, 09:09 PM   #9
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The DLS brake setup works pretty good imo, but nothing compares to a disk. It's pretty easy to swap in the DLS brake plate if you already have the correct hub/axle. But in order to reach the full potential with this front brake setup some extra care is required otherwise it may seem less than satisfactory.

First thing is selecting brake pads with helical arcing, EBC and Vesrah offer a few choices. Inspect the shoe pivot cams and their bores within the plate, clean them so they turn free and apply a small amount of grease to the shaft. Remove the brake linkage arms but shafts still on plate then install the new pads. Install the linkage on the splines then adjust the connecting bar as needed so both pads extend simultaneously.

Next thing is to find some 180-240 grit adhesive sandpaper then apply it in a single layer around the inner surface of the brake drum. Mount the wheel and brake plate on the bike, back off the brake tension if needed. Spin the wheel and slowly apply the brake to begin aligning the shoe to the pads. The sandpaper will contour them together creating greater surface area and improving the pad finish. It may take some time to get them dialed in but it works. Good luck.
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