The Predator engine is available with 3-22 hp horizontal & 5-22 hp vertical shaft models. They are very popular because of their reliability, are easy to modify & can be upgraded with easy to find parts for high hp for racing applications. YouTube for videos if you ever intend to upgrade but no need for regular use.
Nope not Troy but they have some .I used one for a lawn tiller work's great.
Not troy Billy, but the have motors
They sell motors but not that brand
No
They sell small displacement motors, but not specifically Troy built brand.
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