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post #31 of 33 Old 05-16-2019, 04:10 PM
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Re: Kawasaki FD620D Plastic Cam Gear

Here is a picture of how the pushrods work. They never get near a piston. If you notice on the bent rods one was badly bent and the others were each a little less. The valves may have been involved but not the pushrods with the pistons. I think it may have been a few teeth at first and then the timing got really out of whack and that's when it bent the rods.
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post #32 of 33 Old 05-16-2019, 04:17 PM
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Re: Kawasaki FD620D Plastic Cam Gear

pushrods are typically very thin tubs. depending on how everything is aligned, if the piston does wind up hitting a valve, it may just damage the valve, but if the pushrod happens to be weaker or just slightly not perfectly straight, it may bend instead of or as well as the valve.
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post #33 of 33 Old 05-16-2019, 04:27 PM
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Re: Kawasaki FD620D Plastic Cam Gear

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Originally Posted by inspectorudy View Post
Here is a picture of how the pushrods work. They never get near a piston. If you notice on the bent rods one was badly bent and the others were each a little less. The valves may have been involved but not the pushrods with the pistons. I think it may have been a few teeth at first and then the timing got really out of whack and that's when it bent the rods.
Correct. If pistons meet pushrods, that's gonna be replacement of the engine, not repair.

Pushrods get bent (in an interference engine) when pistons meet VALVES. When a steel valve meets an aluminum piston, it leaves evidence. I am not seeing any evidence. There is a *possible* mark on the first piston he shows, but, the other side has zero evidence of anything hitting it. (or, it hitting anything... as the case may be.)

I am also not finding many folks talking about having to replace pushrods with the failed cam gear either...... I find folks with bent pushrods that the cam gear is still good though.

Wonder if the guy in the video just had bad luck.....
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