Cobra XR-1010 Instrukcja Użytkownika Pobierz pdf (Strona 8)

XR250L Project

September ‘94

Page 8

Sprocket Details

The following table shows the final drive ratios for several sprocket sizes.

Rear Sprocket

40 41 42 43 44 45 46 47 48

Front

12 3.33 3.42 3.50 3.58 3.67 3.75 3.83 3.92 4.00

Sprocket

13 3.08 3.15 3.23 3.31 3.38 3.46 3.54 3.62 3.69

Stock

XR-L

I checked these four o-ring chain lengths.

104 stock chain length. Both 12/40 and 13/40 sprocket combinations fit.

106 short wheelbase. The table below shows usable sprocket combinations.

108 long wheelbase. The table below shows usable sprocket combinations.

110 Gordo used this length with his 13/48 sprockets.

In the table below, the chain adjuster columns show the chain adjuster setting.

The slack columns show the amount of measured chain slack. The proper

slack is 20-30 mm. The fit columns indicate if the chain is too loose or if the

sprocket hits the chain guide because the chain is too short (hits guide).

106 Links 108 Links

Front/rear

Chain

Adjuster

Slack

(mm)

Fit Chain

Adjuster

Slack

(mm)

Fit

12/43

13/43

too loose

12/44

13/44

hits guide

too loose

12/45

13/45

hits guide

The 43-tooth rear sprocket and 106 link chain combination yields a short

wheelbase and street biased gearing (using 44-tooth as the median).

The 45-tooth rear sprocket and 108 link chain combination yields a long

wheelbase and trail biased gearing.

When I checked the clearance initially, I found that the sprocket hit the chain

guide when I used a 106 link o-ring chain, a 13-tooth front sprocket, and a

44-tooth rear sprocket. Alex from Charlottesville reports that the 13/44-tooth

combination works fine with a non o-ring chain. I suspect the non o-ring chain

is a looser fit and gives the extra clearance needed.

The two-hole aluminum chain guide brace from Baja Off Road Tours and

Products is a perfect fit.

Aluminum chain guide brace ................................... Baja

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