1989 20 HP Johnson power upgraded to 25 HP for zero dollars

[Stefan]

shawnfish » Today, 09:14[/url]"]it looks factory to me the way the stripe looks like it goes behind that tag/emblem on the back.....

I talked to a buddy today and he said that TNT stands for Tilt and Trim! verfied this online at a couple of sources as well...

https://forums.iboats.com/johnson-evinrude-outboards/how-does-my-power-tilt-trim-thing-work-174330.html

 

[Stefan]

[/quote] theres a pic of the hood. if I didn't tell you already marineengine.com has NOS factory decals for your motor for 45.00 and if I was you id jump all over that deal, gotta be cheaper than custom printed decals....[/quote]

thank you very much for the decal source shawnfish, im checking it out right now... marineengine.com

 

[NH-PLAY]

Ok so my 72 9.9 is really a 15hp just down sized

 

[Johny25]

Nope I am sorry to say that you have a 9.5hp turtleback and not a 9.9hp. In 1972 they made a 9.5hp with the 15ci block and then the next step up was the 20hp in the 22ci block. The 9.9hp 13.2ci blocks did not come out until 74' which is when the 15hp were also put back into production.....before that the 15hp was last made in 1956

 

[Plasticmotif]

Well, with the wife/kiddo and me in the boat it planed out. Definite performance increase! And! I caught a fish in a really over fished lake.

No backfiring issues in the water. I think it needed back pressure on the exhaust. Runs great. Not over-revved at all. My tach isn't in yet. Whenever it gets in, I'll start fooling around with getting a better prop. Mine's in need of replacing.

Lastly, I'll need to play around with my trim when by myself and the idle setting isn't exact but, the boat is doing well.

I don't know that I could be of any help.

I think any OMC motor from 1986 to 2005 will work. I think any 20-25 can be turned into a 30. Just have to find the parts.

 

[Stefan]

Johny25 » 22 minutes ago[/url]"]Nope I am sorry to say that you have a 9.5hp turtleback and not a 9.9hp. In 1972 they made a 9.5hp with the 15ci block and then the next step up was the 20hp in the 22ci block. The 9.9hp 13.2ci blocks did not come out until 74' which is when the 15hp were also put back into production.....before that the 15hp was last made in 1956

Johny25,

You say in 72 Johnson made a 20 hp in the 22CI block. What do you mean by 22CI? The reason I ask is because I have a 20 HP 72 Johnson, and I'm wondering if there are possiblities for upgrading / moding it to squeeze more performance out of it?

 

[Stefan]

Plasticmotif » 21 minutes ago[/url]"]

Well, with the wife/kiddo and me in the boat it planed out. Definite performance increase! And! I caught a fish in a really over fished lake.

No backfiring issues in the water. I think it needed back pressure on the exhaust. Runs great. Not over-revved at all. My tach isn't in yet. Whenever it gets in, I'll start fooling around with getting a better prop. Mine's in need of replacing.

Lastly, I'll need to play around with my trim when by myself and the idle setting isn't exact but, the boat is doing well.

I don't know that I could be of any help.

I think any OMC motor from 1986 to 2005 will work. I think any 20-25 can be turned into a 30. Just have to find the parts.

THats fantastic news that you noticed a difference! Congrats, I'm really glad it worked out for you the same as it did for me... And thanks for posting that pic, looks like you and your family had an awesome day on the water! Keep up the great fishing and boating!

Are you going to be revamping your boat?

 

[shawnfish]

Stefan » Today, 13:00[/url]"]

Johny25 » 22 minutes ago[/url]"]Nope I am sorry to say that you have a 9.5hp turtleback and not a 9.9hp. In 1972 they made a 9.5hp with the 15ci block and then the next step up was the 20hp in the 22ci block. The 9.9hp 13.2ci blocks did not come out until 74' which is when the 15hp were also put back into production.....before that the 15hp was last made in 1956

Johny25,

You say in 72 Johnson made a 20 hp in the 22CI block. What do you mean by 22CI? The reason I ask is because I have a 20 HP 72 Johnson, and I'm wondering if there are possiblities for upgrading / moding it to squeeze more performance out of it?

HE MEANS YOUR BLOCK IS 22 CUBIC INCHES...

 

[shawnfish]

Stefan » Today, 13:00[/url]"]

Johny25 » 22 minutes ago[/url]"]Nope I am sorry to say that you have a 9.5hp turtleback and not a 9.9hp. In 1972 they made a 9.5hp with the 15ci block and then the next step up was the 20hp in the 22ci block. The 9.9hp 13.2ci blocks did not come out until 74' which is when the 15hp were also put back into production.....before that the 15hp was last made in 1956

Johny25,

You say in 72 Johnson made a 20 hp in the 22CI block. What do you mean by 22CI? The reason I ask is because I have a 20 HP 72 Johnson, and I'm wondering if there are possiblities for upgrading / moding it to squeeze more performance out of it?

THE 20 AND 25 IN 72 BOTH HAVE THE SAME POWERHEAD...

 

[shawnfish]

shawnfish » 4 minutes ago[/url]"]

Stefan » Today, 13:00[/url]"]

Johny25 » 22 minutes ago[/url]"]Nope I am sorry to say that you have a 9.5hp turtleback and not a 9.9hp. In 1972 they made a 9.5hp with the 15ci block and then the next step up was the 20hp in the 22ci block. The 9.9hp 13.2ci blocks did not come out until 74' which is when the 15hp were also put back into production.....before that the 15hp was last made in 1956

Johny25,

You say in 72 Johnson made a 20 hp in the 22CI block. What do you mean by 22CI? The reason I ask is because I have a 20 HP 72 Johnson, and I'm wondering if there are possiblities for upgrading / moding it to squeeze more performance out of it?

THE 20 AND 25 IN 72 BOTH HAVE THE SAME POWERHEAD...

THEY ALSO HAVE THE SAME INTAKES, CARBS AND EXHAUST TUBES... ALL 4 PART NUMBERS MATCH. NOT SURE WHAT MAKES THEM DIFFERENT MAYBE HIGH SPEED ORFICE??? LOOKS LIKE YOU GOT SOMETHING TO DO.....

 

[Johny25]

Yes the ci stands for cubic inches like shawnfish stated, and I show a different carb number for the 20 and 25hp in 1972 but not sure beyond that. Some investigating may be in order for you possibly.

 

[shawnfish]

Johny25 » 29 minutes ago[/url]"]Yes the ci stands for cubic inches like shawnfish stated, and I show a different carb number for the 20 and 25hp in 1972 but not sure beyond that. Some investigating may be in order for you possibly.

where are you looking at the numbers? on evinrudes site it shows the replacement numbers not matching and marineengine shows the original numbers matching.... I tend to believe the originals but yeah I think a bit more investigating is needed...

 

[Johny25]

Marineengine and boats.net shows the 20hp with carb number 384529 and the 25hp as 384530 in 1972 and the only thing I can see from a quick glance that is different is the jets......the 20hp having the 67D and the 25hp having the 72D

 

[shawnfish]

Johny25 » Today, 00:33[/url]"]Marineengine and boats.net shows the 20hp with carb number 384529 and the 25hp as 384530 in 1972 and the only thing I can see from a quick glance that is different is the jets......the 20hp having the 67D and the 25hp having the 72D

just looked on ME agagin. 25r72r and 20r72r both have the 0383725 carburetor and the 20hp has the 67D and the 25 the 72D.

 

[Johny25]

I think you are looking at just the carb body part number

 

[Johny25]

Look at the carburetor assembly part number, this would be the entire carburetor with all the parts. If the numbers don't match then you can be assured something is different in the carbs

 

[shawnfish]

Johny25 » Today, 09:58[/url]"]Look at the carburetor assembly part number, this would be the entire carburetor with all the parts. If the numbers don't match then you can be assured something is different in the carbs

correct. lol! I don't know why I did that I know better. may have had 1 or 5 too many brew ha's yesterday :beer:

 

[Johny25]

:beer: nothing wrong with that

 

[Stefan]

shawnfish » Today, 02:46[/url]"]

Johny25 » Today, 00:33[/url]"]Marineengine and boats.net shows the 20hp with carb number 384529 and the 25hp as 384530 in 1972 and the only thing I can see from a quick glance that is different is the jets......the 20hp having the 67D and the 25hp having the 72D

just looked on ME agagin. 25r72r and 20r72r both have the 0383725 carburetor and the 20hp has the 67D and the 25 the 72D.

Ii am going to investigate this further, with all the information posted thus far on the 72 johnson 20 HP as a potential upgrade looks promising.

Once I end up doing the mod, I will post pics and start a similar thread for this model engine. I just have to buy some parts for this engine, as it is missing a couple of minor parts, like the lean / rich linkage arm. She needs just a bit of attention. Once I get her upto snuff I'll start in on the mod and go from there...

These engines are so versaitile and intuitive, with due care and research it is very easy to work on them

 

[longshot]

Stefan » 31 Aug 2013, 14:01[/url]"]

longshot » Today, 09:55[/url]"]I just did something very similar to this on my 2003 tohatsu. It needed the carb overhauled and I discovered the 9.9/15/18 were all the same except for the carbs. So I ordered a new 18 carb runs great in the tank I will be trying it out at the lake in the morning

How did it go? did you notice a big diference in speed and power??

I took it to the lake today and ran it hard. Burned up about 5 gallons of gas. We had a cooler two bags of gear tackle boxes live well full trolling motor and battery and full fuel tank. We were able to obtain 21 mph on the gps and it was very rough out. Before I changed carb and raised jack plate all I could get was 16 mph plus it started on the first pull every time. My boat is a G3 1544