Upgrades for 92’ 25hp Johnson to gain some more speed!

[ethanwerl]

Looking for some advice to get some more juice. I am running this on a 14ft jon boat v hull and was 2 people loaded down going 22 top with wind. What best?

 

[Crosbyman]

Adjust the prop choice to situation. check & clean the bottom of the boat If engine is running ok & runs max rpm per specs ..reduce the load or max out the HPs to the boat's rated capacity.

 

[saltchuckmatt]

Find a used 30 or 35 HP carb in compatible years...direct swap.

Get a tach, make sure your in the rpm curve by selecting the right prop.

Go on a diet.

 

[Ifishmuskie2]

Use a SS prop. I got 2mph more and it doesn’t get affected by more weight in the boat as much as aluminum prop did.

 

[tphoyt]

If the motor is running well and reaching max rpm you may not get much more out of it. What is your guess on the weight you pushing?
2 people and a load of gear can mean many things.
If your reaching max rpm have your tilt set correctly and weight distribution is good I don’t know that you will gain much more than what you have out of a 25hp. 22mph isn’t to bad.
Jmo

 

[saltchuckmatt]

If the motor is running well and reaching max rpm you may not get much more out of it. What is your guess on the weight you pushing?
2 people and a load of gear can mean many things.
If your reaching max rpm have your tilt set correctly and weight distribution is good I don’t know that you will gain much more than what you have out of a 25hp. 22mph isn’t to bad.
Jmo

Dr Tim is very correct. He has found the force. Keep testing your 25. Are the butterfly's opening all the way?

The correct link and sync have been done?

Boat bottom clean?

Many factors here.

 

[racerone]

Step #1 is to determine condition of the motor.----Find a shop that can run it with a test wheel / prop.-----Or find a 30 ( prop rated ) or older 35 HP carburetor.

 

[jimmbo]

Find a used 30 or 35 HP carb in compatible years...direct swap.

Get a tach, make sure your in the rpm curve by selecting the right prop.

Go on a diet.

While it will bolt on, things like the Cam on the Armature Plate is often different, and often the Intake Manifold is different. At best, if you are able to gain any power, it is only gonna be a mile or 2 mph more.
Proper Propping, Loading of the Boat, Engine Trim, and Hull Condition, and Cleanliness will be bigger improvements than a few HP. Also get rid of any unneeded Weight. That means the Wife, kids, and Mother In Law are to be left ashore. Girlfriends and Mistresses, can remain aboard

 

[racerone]

Hole in the 25 HP intake manifold can be opened up.-----Knowing that the motor has a 30 / 35 HP carburetor will automatically make it " feel " so much faster.

 

[airshot]

Without going bigger on hp of motor, the most your gonna gain is 2-3 mph at best....hardly worth the trouble ! If you could jump up to a 40 hp, then you might see some real gain..

 

[saltchuckmatt]

Comedy Central is now here...and I got a good laugh.

Jimbo was the best but Racerone was a close second.

Sometimes just working on them or painting them different is fun...
And I enjoy it.

My 1974 Lund does 27 with a fully loaded boat. Motor is a 1985 fully stock 30 HP johnson...or is it. I'm running an 11 inch pitch stock prop and it's right down the middle in the rpm range. I really don't care, I just have fun seeing what else i can do to it.

Thank you.

 

[Crosbyman]

try want adds for a bigger boat...

 

[saltchuckmatt]

try want adds for a bigger boat...

View attachment 413608

This day just gets better and better!

 

[airshot]

Comedy Central is now here...and I got a good laugh.

Jimbo was the best but Racerone was a close second.

Sometimes just working on them or painting them different is fun...
And I enjoy it.

My 1974 Lund does 27 with a fully loaded boat. Motor is a 1985 fully stock 30 HP johnson...or is it. I'm running an 11 inch pitch stock prop and it's right down the middle in the rpm range. I really don't care, I just have fun seeing what else i can do to it.

Thank you.

Very cool on the "RedTail" name....those boys were awesome fliers !

 

[jimmbo]

Comedy Central is now here...and I got a good laugh.

Jimbo was the best but Racerone was a close second.

Comedy? I was being dead Serious about leaving the Wife, Kids....

 

[Crosbyman]

Comedy? I was being dead Serious about leaving the Wife, Kids....

A buddy at work always said separating from his wife was simply to much pain to bear .He could not bear the pain of serarating himself from half of his estate !