How to Adjust a Chain Tensioner on an ATV

Improper drive chain slack can cause an All Terrain Vehicle (ATV) engine to overload. It can lead to drive chain slippage or breakage. Your ATV manufacturer will have specified certain limits for drive chain slack. For example, Yamaha specifies 1.77-2.17 inches for the Raptor 250SE ATV chain. Check the drive train slack before each ride and adjust it if necessary.

Things You'll Need

• 4-inch long, 0.3-inch diameter metal rod

Instructions

1. Place the ATV on a level surface. Make sure there's no weight on the ATV and that all tires touch the ground.

2. Move the ATV backwards and forwards to find the tightest part of the chain and then measure the slack.

3. Compare the measurement with your manufacturers specified drive chain slack. If it's incorrect, adjust it.

4. Loosen the rear axle pinch bolts.

5. Insert the rod into one of the holes in the drive chain tensioner.

6. Shift the transmission into neutral and push the ATV backwards to tighten the drive chain. Push the ATV forwards to loosen it.

7. Pull the rod out and then tighten the rear axle pinch bolts to the torque specified by your manufacturer.

Tips & Warnings

• Your ATV dealer will sell you a metal tensioning rod.

• Lubricate and clean the drive chain regularly to avoid premature wear. This is particularly important in dusty or wet areas. Always lubricate the chain after riding in the rain or washing the ATV. Clean the chain with kerosene and a small brush.

References

• Yamaha Raptor 250SE Owner's Guide