XR250L Project
September ‘94
Page 7
Sprockets
The XR-L stock gearing is too street oriented for my taste. I wanted something
more trail oriented, so I looked into various sprocket and chain combinations
(see Sprocket Details on the next page). If you look at the chain guide rubbing
block, you’ll notice that it points down at the back. I think Honda planned for
alternate gearing and a larger rear sprocket.
I suggest that you consider the 43, 44, or 45-tooth rear sprockets, which work
with the stock chain guide. I wouldn’t bother with the 41 or 42-tooth rear
sprockets because the drive ratio is too close to stock to be of much benefit.
The 46, 47, and 48-tooth rear sprockets are too large. Gordo opted for a
48-tooth rear sprocket and had to make a chain guide lowering block.
If you want the flexibility of changing back and forth between two final drive
ratios without having to change chains, you should choose either the 43 or
45-tooth rear sprocket depending on the wheelbase and type of gearing you
want. Then, to switch between street and trail gearing, you change only the
front sprocket (12<>13). I put the 43-tooth rear sprocket on my bike.
If you don’t want to change the front sprocket back and forth and don’t mind a
fixed final drive ratio, try the 44-tooth rear sprocket. It provides a good
compromise between trail and street gearing with either a 12 or 13-tooth front
sprocket. The 12/44 combination is almost identical to stock XR250R final
drive ratio. The 13/44 combination is exactly midway between stock XR-L and
XR250R final drive ratios. As Sprocket Details shows, the 44-tooth rear
sprocket does not allow you to switch the front sprocket back and forth while
staying with the same length chain.
Note that the XR-L has the same transmission gear ratios as the XR250R for
1st through 3rd gears. The ratios for 4th through 6th gears are slightly higher
(numerically smaller), so the XR-L is better suited to street riding regardless of
the final drive ratios. If you choose the 12/44 combination, which is almost
stock XR250R final drive ratio, you’ll still have higher overall drive ratios in the
upper three gears than an XR250R.
The rear sprocket has the same wheel-hub hole and bolt mounting locations as
the ‘87 XL250. However, because the XR
-L has a cushion drive hub, the
sprocket is machined one millimeter deep on the inside surface out to a
diameter of 172 mm to compensate for the cushion drive offset. Sprocket
Specialists is the only company making XR-L rear sprockets at this time. You
can get their sprockets through XR’s Only or through your local dealer.
The front sprocket has the same size splines as the ‘88 through ‘91 XRs (‘86
and ‘87 are
not the same). Although the stock size for the XR and XR-L is
13-tooth, several manufacturers make 12-tooth sprockets for the XR, and they
will fit the XR-L.
12
-tooth steel
........................................................... CHAP 568-12
12
-tooth steel
........................................................... DK 8-925-12
43, 44, 45-tooth aluminum...................................... XR’s or local dealer
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