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Kawasaki MX & Off-Road Dirt Bikes
1989 KX250 slight knocking noise....
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[QUOTE="Maverik, post: 885354, member: 59279"] When your piston travels up and down, at each point, top and bottom, it has an up and over or down and under type of movement it has to contend with from the crank, because the connecting rod doesnt move straight up and down. With increased clearance the bottom end of your piston has room to move or rock and will slap the cylinder. The less room to move, the less slap. Its not hard to explain, but for some reason i cant think of a good way to word what Im trying to say. Im probably confusing you more then helping, sorry Micah. Basically if there is room to move, it will. When you put it back together Im sure you would have noticed excessive slop in the wrist pin. If you take it apart again, you can try grabbing the piston and while holding the rod, try pulling up and pushing down on the piston to see if it moves. On the wrist pin side to side play is normal, up and down shouldnt exist. And since you have it apart, you can try the same thing with the connecting rod bearing at the crank. slight side to side play is ok, up and down is not a good thing. [/QUOTE]
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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
1989 KX250 slight knocking noise....
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