1962 75hp johnson prop

[dieselmax]

i have a 1962 75 hp on an old 1973 i think 14' vanguard trihull prop size is 10x12. The problem is it takes a very long time to get on plane 5 to 7 minutes on calm water engine seems to be bogging during this period once i get up on plane all is fine runs greats top speed of 30 mph according to gps. I'm sure the boat is very heavy along with two fat guys piloting it lol <br />would a smaller pitch be a could place to start?

 

[OBJ]

Re: 1962 75hp johnson prop

You need to know what the rpms are max. You got a tach? Just putting a smaller pitch prop on it without knowing what the engine is turning could spell disaster. It could also be the engine set up on the boat. Take a look at the anti-cav plate (the "fin" just over the prop) and see where it sets in relation to the keel. Rule of thumb....it should set no more than 1" below or above the keel....preferably 1" above. <br /><br />Also, have you tried different engine tilt angles?

 

[dieselmax]

Re: 1962 75hp johnson prop

thanx for the info i have no tach. About the anti cavitation plate i'm not sure how far down it is i'll measure it today as for the tilt angles i've tried them all. where is a good place to get a tach?

 

[dieselmax]

Re: 1962 75hp johnson prop

just checked the anti-cav plate it is 1.5 inches below the bottom of the boat found an old spec sheet from 1963 and 10 1/4 x10 standard prop i think anyways small print got fuzzy when enlarged

 

[dieselmax]

Re: 1962 75hp johnson prop

after some serious thought maybe i'm barking up the wrong tree.It could be that i'm haveing ignition or fuel problems gonna order a carb kit and points and condenser would like to find a new distributor cap and rotor but they seem few and far between the model is v4al-15e any one have any ideas where i could get a cap and rotor?<br />also gonna get a manual so i can check my timing and timing advance