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Kurlon

Yamaha stem lengths

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I'm working on reviving a 1992 WR250 (yup, it's a smoker, but wait!) as a supermoto.  Part of the rebuild is swapping on a 2009 YZ450 front end.  The conversion appears to be pretty straight forward, stem bearings are compatible, no problems, right?  To make things more interesting I'm having a set of custom offset clamps made up for this endeavor.

 

The one detail I haven't sorted yet is the steering stem.  My 92 stem setup isn't compatible with modern YZ clamp sets, I also don't have a modern YZ on hand to compare against.  Doing some searching I see there are three common lengths Yamaha used but no actual numbers to go with 'short', 'medium' or 'long'.

 

Looking at Applied Racing 's online catalog they have the following notes:

 

'Short' YZ stems fit:

98-14 YZ125

98-12 YZ250F

98-09 WR250F

 

'Medium' YZ stems fit:

08-15 YZF450

12-15YZF250

 

'Long' YZ stems fit:

98-14 YZ250

98-07 YZF4XX

98-10 WR450F

 

I also found some notes that Yamaha changed the OD of the portion of the stem that presses into the lower clamp sometime around 04 / 05, so that's good to know.

 

So, what I need I guess is distances between the bearings for the three stem lengths so I can compare to my frame and determine which to get?  Anyone got numbers to share?

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I can give you the length of the long stem later today.  Meanwhile, I can tell you that the mid length stem will be 5mm shorter, and the short stem about 10-12mm shorter.

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Much appreciated, and that almost makes it sound like I could just plan on using long stems with spacers if needed... assuming my machine isn't a freak that needs an even LONGER stem than modern machines.

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Visited the local dealership and got some ballpark measurements with a tape measure.  (Yeah, not accurate, I know, but it's what I had.)  They have a 2015 WR250 and YZ450 on the showroom floor, which based on the fitment data from Applied Racing should be a medium and long stem, respectively.  7.5" between the bearing faces roughly on the WR, touch longer on the YZ.  On my antique I'm at about 7.5" as well so I suspect the medium will do the trick?

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Only in a rough kind of way.  I seem to have come up missing the loose one I had.  I'll see how accurately I can measure the one on my bike.

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I just lucked out, I've got drawings with dimensions for YZ stems, so now I can compare to my setup and select the right one.  Of course, it means I have to take my front end off again... d-oh! :D

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