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What sizes spark plug does a 103 engine take?

Please provide more context! "103 engine" is too vague.

To determine the correct spark plug size for your engine, I need to know:

* Make and Model: What brand and model of engine are you referring to? (e.g., Honda GX390, Briggs & Stratton 103, etc.)

* Year: What year was the engine manufactured?

Once you provide this information, I can help you find the correct spark plug size.