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Old 05-14-2009
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The motor mount probably says that because for the maximum HP it is rated for, the four-stroke motor will be considerably heavier than the two-stroke version, and it will break under the weight and force of the four-stroke motor. Unless you're close to the maximum weight and HP for the bracket, using a smaller four-stroke on it should not be an issue. For instance, if you have a bracket that is rated for up to a 10 HP two-stroke motor or 100 lbs., putting a 9.9 HP four-stroke motor on it, that weighs over 100 lbs. is probably a bad idea. But I would be seriously surprised if that same bracket couldn't handle a 8 HP four-stroke motor that is 85 lbs.

Johnson apparently still makes a two-stroke motor. The four-stroke motors are far more fuel efficient and usually quieter than the two-stroke variants, but a bit heavier.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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