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:
'Medium' YZ stems fit:
'Long' YZ stems fit:
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?