The Suzuki Z400, a standard sized ATV, is driven by a chain. The Suzuki Z400's chain can become loose over time. Tightening the chain is a simple process that most people can accomplish. Whenever tightening, err on the side of making the chain looser rather than tighter. Driving ATVs with overly tightened chains often causes permanent damage to the engine.
Park the Suzuki Z400 in a level, well-lit location, such as a garage. Shift the gear into neutral by moving the gear shifter.
Slide a crescent wrench over one of the lug nuts on a rear wheel of the Suzuki Z400. Loosen the lug nut by turning the wrench counterclockwise. Repeat the process for all of the lug nuts, and for the other rear wheel.
Loosen the securing nut of the left tire using an end wrench. Loosen the securing nut of the right tire using an end wrench.
Locate the Suzuki Z400's chain, near the bottom-rear of the ATV. Locate the chain's tightening bolt, near the rear of the chain. Turn the tightening bolt clockwise to tighten the chain. Turn the chain one to five full rotations, depending on the desired tightness.
Tighten the securing bolts of both wheels using a wrench.
Tighten the lug nuts on each wheel using a socket wrench.
