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Old 15 August 2015, 22:19   #1
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Avon s400 with 25 hp merc 2 stroke goes to max revs at 1/4 throttle

I recently bought an avon s400 with a 25 hp merc... she ran great for 7 outings and then all of a sudden after giving her 1/4 throttle she revs to the max and slows down..... what can b causing this??? Took the motor in its good... marked the prop and no slipping.... help!!!!
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Old 16 August 2015, 02:37   #2
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my head is shouting gearbox... when you say took the motor in its good what does that mean? Clearly something isn't right.
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Old 16 August 2015, 09:52   #3
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could be the prop rubber cush drive hub spinning? do you have another prop to try?
I would have though if it was the gearbox it would be accompanied by crunching and grinding noises.
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Old 16 August 2015, 16:38   #4
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Tried another prop..

Tried another prop... same thing.... marked my prop.... no slippage.... adjusting the height of the motor today... gonna try that
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Old 17 August 2015, 18:16   #5
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Sounds like cavitation. Is the boat correctly inflated? Trim set correctly?
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