Will push 18 foot boat at 2,000rpm then tachometer jumps to 5,000 rpm boat not responding
Many mercury motors use a rubber mounted prop on the shaft which is a sacrificial idea to prevent gear box damage and prop damage in with under water objects
what you suggests indicates that at certain load situations that rubber has failed and allowing the shaft to turn but is not driving the prop as required
It is driving just enough to give you steerage to get home
SOURCE: outboard problem
Adjust the bottom Finn under propit has to be perfectly straight when motor is straight it's like a rear end ailinemen for your boat
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