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You probably have the wrong spark plug(s) installed. The wrong spark plug may be longer than specifiactions amd is why the piston is hitting it. If you have the correct spark plugs installed, then it is likely that one of the valves is stuck in the open postion. You can determine this with a compression test. You do not want to drive around with the piston hitting either the wrong spark plug or stuck valve - will damage or crack the piston and will be a costly repair. It is probable that the stuck valve (if that's the problem) may be bent.

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Q: Why does the piston hit the spark plug on a 93 Mazda b2600 4x4?
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