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Do you happen to have the engines serial number handy?
The older 80's units take an NGK BPZ-8H-N-10 for a plug. I wanted to run your serial number to make sure that is actually what you had though. But if your positive on the year, it will be that plug.
Post back with questions.Good luck!
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It all depends on why the plug is wrong. Plugs come in different shapes, styles, and heat ranges. The most common mistake is a wrong heat range plug.
If you put in to cold of a plug, it's no big deal, and the spark plug fouls out prematurely
If you put in to hot of a plug, you can melt the motor down internally.