MORE SPEED

[Syfert]

Is there an easy way to get more speed out of my 1995 Honda BF25. With three people in the boat the speed is dramatically decreased. I bought the motor used but I believe it has the original prop still on the motor (9 1/4 x 12). I have read a few posts about re-jetting the carbs on a BF35 to make it a BF 45. Is this possible for the 25 hp Honda? The motor is on a 14' flatbottom boat with 48" bottom. Can someone give me a few ideas please.<br />Brian

 

[JB]

Re: MORE SPEED

Howdy, Syfert.<br /><br />I really doubt that the differences in 25 and 35hp Hondas is limited to jets. I think you would end up with a rich-running 25 that didn't perform as well as the original. You are talking about a 40% increase in hp.<br /><br />Your best return on investment in search of optimum top speed would be in hull surface condition and in propping and rigging your engine.<br /><br />To optimize your prop you will need a tachometer. There is abundant advice for "propping out" an engine in the archives here. A search will keep you occupied for hours. There will also be advice on how to determine the best "X" dimension mounting of the engine.<br /><br />Good luck.

 

[Syfert]

Re: MORE SPEED

JB,<br />Thanks for the reply. I've never changed a prop on any of my outboards, can you tell me a safe alternative to the 9 1/4 X 12 prop that's on my motor now. I'm willing to give up a little power<br />for a little speed.

 

[LubeDude]

Re: MORE SPEED

Like JB said, You need a tachometer to tell you what your RPMs are in order to know what prop to use! changing a prop without knowing your RPMs is a shot in the dark and can cause engine damage by over reving it!<br /><br />More speed? After all, you have a 25 HP outboard, what do you expect to achive?<br /><br />LubeDude

 

[walleyehed]

Re: MORE SPEED

If you give up power for speed, you can forget hauling more than yourself and maybe a small child and still get on plane.<br />As stated above, a tachometer is a must, as well as knowing the max wide open throttle range of your engine.<br />There are many items to look at in terms of increasing speed, but we must have a base-line to start with....it's not as simple as just changing props.

 

[jim dozier]

Re: MORE SPEED

Funny thing, I noticed a dramatic decrease in speed in my Acura GSR automobile when 3 of my friends get in.