help??

[1BassFisherman]

when my 75hp evinrude takes off it takes a little while to get to max Rpms sort of like and automatic car. would that be it slipping if so we just put a new prop on the motor and it was to my understanding that the clutch is built in the prop..let me know what you think.

 

[merc16]

Re: help??

yes the clutch is built into the prop and the only job the external clutch has, is to slip when it spins against an underwater object. im thinking the problem is you have too high a pitch on the propellor. thats why you arent getting high rpm's. try a prop with the pitch of 11 to 16.<br />in case you dont know the pitch in simple terms is basically the angle of the blades on the propellor. talk to your mercury dealer about getting a prop with the pitch 11 to 16 inches. then this will increase your rpm's

 

[roscoe]

Re: help??

How long is "a little while" ? A couple seconds to get the boat on plane, and then the rpm should climb quickly to about 4700 rpm. Then gradually increase as the motor evens out and the prop is trimmed up. Total about 4-7 seconds. A little longer with a heavy load. You can't expect the engine to go from 700 rpm to 5500 rpm in an instant. There is resistance on the prop and the engine has to build up torque gradually.<br /><br />The transmission in the lower unit is either in gear, or out of gear. The rubber bushing in your prop, can and will slip when hitting stumps or rocks. It can also just get old and start to slip under hard accelleration.

 

[1BassFisherman]

Re: help??

Thanks it takes a couple of seconds for the rpms to climb then when it is on plane it does good it just takes a while to get on plane. thanks that helped me better understand it. i now think that it was more than likely working right all along<br /> 1BassFisherman

 

[1BassFisherman]

Re: help??

I checked the pitch and it is 17 so you think that may be messing it up let me know