2003 Bombardier Rally 200 Service Manual, Page 228Get this manual
Section 06 DRIVE TRAIN Subsection 02 (REAR AXLE)
Adjust chain deflection by slowly moving the ATV forward so any slack that may have previously been on the under part of the chain is now on the top of the chainThe bottom part of the chain should be taught during adjustmentThe deflection should be between 10 and 20 mm (38 and 34 in)
REAR SPROCKET
Removal
Lift rear of vehicle and install jack stands under the frame to support the rear of vehicle off the groundRemove RH rear wheel and wheel hub no6Remove drive chain no1
V06H06A
Turn the axle forward to increase or backwards to decrease chain free playTighten the chain tensioner lock bolts to 43 Nm (32 lbfft)CAUTION: Never operate this vehicle with the drive chain too loose or too tight as severe damage to the drive components can occurWhen the adjustment is done, repeat the above procedure to check the deflection several times at different spots on the chain