Full revs, go nowhere after jump or fast turn

[cxxl]

My Force 70hp is doing strange things lately. After going fast jumping swell, or sometimes after a fast tight turn, the revs go to max but the boat slows down. I throttle down, and accelerate again and all is OK. Is this some kind of cavitation, or is my engine jumping out of gear??? <br />Thanx

 

[ob]

Re: Full revs, go nowhere after jump or fast turn

It's either cavitation ,which I can't see or experience from where I'm sitting to evaluate ,or you have a spun prop.Since you say this is occuring after a jumped wake or fast tight turn and not during I am inclined to think you have a spun prop.Make a mark on the rubber hub of your prop adjacent to the barrel of prop and run motor in same situation and see if marks still line up.Or just simply do a careful visual of hub damper to see if it is spun.You can also try a search on this forum entering "spun prop."

 

[Bear]

Re: Full revs, go nowhere after jump or fast turn

Hi cxxl!<br />Lately, you said. If you have changed your prop or raised the enginge height it can be cavitation or ventilation. <br />But most likely it it time to visit the propeller doctor. Check this first! And what ob suggested; mark it, test it, check it.

 

[DJ]

Re: Full revs, go nowhere after jump or fast turn

cxxl,<br /><br />I'm relatively cerain that you are just experiencing cavitation.<br /><br />Do you have power trim? If so, try the manuevers with the engine trimmed "in" further. If not, lower the engine one notch with the trim pin.