40hp Johnson, Better Prop?

[BryanL]

CAn anyone provide a bit of input on a correct prop for a later 60's Johnson 40hp. Good power out of the hole but gets quite doggy when making easy turns pulling young children on a single tube, very simply it doesn't take much at all to lose the speed and power, wouild like just "bit more umph" I belive at present it has a 10-3/8 x 12 prop. Thanks for any thoughts.<br /><br />P.S the motor Runs out great and is on an older 14" StarCraft runabout.

 

[norman158]

Re: 40hp Johnson, Better Prop?

what is the max rpm that you are getting out of this set up ?

 

[Spidybot]

Re: 40hp Johnson, Better Prop?

Prop size doesn't sound too bad. There are some other parameters to the equation, though.<br /><br />What is your load (boat + all in it)?<br />Is your prop and lower unit in good shape (damages)?<br />Is your hull clean ?<br />How high is your motor mounted on the transom ?<br /><br />If you want to know more about props and boats, look here http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=17;t=014920 or do a search in these forums for 'prop' or 'pitch'

 

[Lark40]

Re: 40hp Johnson, Better Prop?

If your late '60's engine is similar to my 1960 (I think it is), then the factory prop should be 10 3/8 X 14, which would be the higher speed version for a light boat. 14' is usually a light boat.<br /><br />However, a 12" or a 13 1/4" pitch would seem OK if you are pulling skiiers.