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What motor is in a 1973 Johnson snowmobile 400?

Updated: 8/17/2019
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14y ago

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If it is a 1973 model, there was only one engine- the 399cc opposed twin which was made by OMC. There was two versions of this engine-a 21 hp and a high performance 30 hp. You could tell the difference between the two engines easily. The 30 hp engine had dual exhaust(2 mufflers) and also ran on premium gas only.

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14y ago
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Q: What motor is in a 1973 Johnson snowmobile 400?
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