2012 Kawasaki KX250F Owners Manual - Page 87

MAINTENANCE AND ADJUSTMENT 85 overly tight chain, which can cause it to break. To prevent this, adjust the chain slack (measured between the chain and the swingarm) to 62 a 68 mm (2.4 a 2.7 in.). j Chain Wear Inspection When the chain has reached its wear limit (i.e., when it has stretched by 1.7% of its original length), it is no longer safe for use and should be replaced. Since it is impractical to measure the entire length of the chain, determine the degree of wear by measuring a 20-link section of the chain. Tighten the chain either by using the chain adjusters or by hanging a 10 kg (22 lb) weight on the chain. Measure the 20-link length on a straight part of the chain from the center of the 1st pin to the center of the 21st pin. If the length exceeds the service limit, the chain should be replaced. Since overworn sprockets will cause a new chain to wear faster, inspect both the engine and rear sprockets whenever the chain is replaced, and replace them if necessary. • • A. Turning Clockwise WARNING A loose axle nut can lead to an accident resulting in serious injury or death. Tighten the axle nut to the proper torque and install a new cotter pin. • Check the rear brake effectiveness. NOTE żWhen riding in wet and muddy conditions, mud sticks to the chain and sprockets, resulting in an