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Message: <blockquote data-quote="freeisforme" data-source="post: 518649" data-attributes="member: 34644">Usually a lower compression motor will run so long as both are even psi, but you may have issues running when the back pressure increases  wen in the water. I've had viable motors down to 55 psi but they lacked power. Most 18hp motors I've had were well over 100psi. some as high as 190 psi and so hard to pull they broke ropes.</blockquote>