Upgrading a 20hp Johnson Evinrude to a 35hp

[@danielrobert7181]

Easy easy but you do have to start with the later larger displacement 20 hp in order to get, inter alia, the larger flower-shaped leaf valves. Happy conversion to all !

[@pjimmbojimmbo1990]

Inner Exhaust Covers are different between the engines. Throttle Cams were also different

[@wish2fish37]

Good video.Are the spacers for the pull start home made? If so can you show them in a short video?Or explain what they are made of and how?

[@Mishanya209]

Добрый день. Отличная работа! У меня такой же мотор, только с ручным стартером. Хотел поменять на электрический, но в нас в России запчастей почти нет на него

[@slgthagang4438]

Would this work for a 2003 Johnson 25 electric start

[@minikodtlivov3184]

Hello, if someone could say what is the carburetor diameter of 20hp vs 35hp....thanks...

[@zulgadams5837]

What about re-proping? was it necessary too?

[@randyroth383]

That carb is a 30 A35 carb doesn't have that brass bar in side of the throat. You can take it out from the top crome cap ✌️gane 5 hp hope this helps

[@Bigtime_mcalpine]

Really? Have you pulled the brass bar on any yourself? You’ve got me curious about what it’s for.

[@randyroth383]

@@Bigtime_mcalpine yes I took mine out what it does is makes it 30 with it 35 with out big time gain people don't no in these channels popping up 🤣u might see my comments but back to the chalkboard carb kits on line some have freeze caps for the top now 38hp Johnson carb same size an jets .

[@bobbleja2244]

Randy I have 3 35 hp and all have that bar yrs I have are 76 77 and 79

[@randyroth383]

@@bobbleja2244 a friend the carb I have it came off of a Evinrude 70s 70 hp bottom carb it doesn't have the bar in it it has the same jet main as a 30 hp stock but with no bar it can get more gas thru to the motor witch makes more power to be a 35 hp in stead of a 30 with the bar restriction less gas . I hope that makes cents . You can read up on the forums on Internet

[@saulgood9348]

Links for upgrade parts?

[@emilsjset5283]

Did it run good after the install

[@Bigtime_mcalpine]

Yep like butter.

[@JEC920]

This is so helpful, thank you. I'm looking at doing this same thing to my 20hp '88. Where did you get the parts?

[@Bigtime_mcalpine]

You need to be on the look out for part out engines at a discount.

[@articvinter]

What is the difference between a 30hp vs 35hp carburettor?

[@GAWRONTUNING]

? Pleas answer this question :)

[@Gadding.motormania]

​@@GAWRONTUNINGnothing. 30-35hp is same engine.

[@Dudlushka]

What are the earliest/latest motors on which this upgrade works? I'd like to buy an evinrude, that has power pack ignition, but the pull rope part is not painted... So it looks early 80s

[@Bigtime_mcalpine]

I don’t know the exact year but as long as it’s not a split gear case it can be done. Earlier models require some minor carb adjustments like I did on mine but I think all 80s and all 90’s until maybe 98 can have this done.

[@Dudlushka]

@@Bigtime_mcalpine thx, does it matter if its a tru-hub exhaust or not?

[@Bigtime_mcalpine]

@@Dudlushka I don’t know what that is but as long as powerhead is no different I would guess it should be fine

[@Dudlushka]

I think some early 80s motors has different lower unit (with 70s style exhaust - and "cone shaped" prop nuts) but with -whats the proper term?- not the shear type props, but nor the modern looking "holed" props, like the one you probaby have. So Im a bit unsecure to buy that. What do you mean by split gear transmission?

[@Bigtime_mcalpine]

@@Dudlushka I think we are describing the same motor. By split gear I meant split gear case which also means older prop style like you are describing.

[@Exotics_248]

Can you do it with a 97

[@2010Dillinger]

I have 1989 model with electric starter. Thinking to do same thing. I have couple questions 1. Do you have parts number? 2. Do you need to adjust the timing?

[@Bigtime_mcalpine]

Just head to marineengine.com for part #’s. As for the timing you do need to adjust carb opening timing but nothing more than that.

[@randyroth383]

I did a lot of these motors 🙋🍿

[@thomassmith9305]

The line from the intake manifold connects to the primer jet on the top of the carb? I have an 85 and the line from the primer pump goes to the jet on top of the carb. I don't understand how yours works if it's setup the way I said.

[@andyackman]

I capped the fitting on the intake mine works fine but I also switch the manual choke that came with my 35hp

[@randyroth383]

Some 20 hp reeds look like 3 leaf clover flower you have the better reeds biger hole for 30 35 look like triangle hole what it needs ✌️

[@Gadding.motormania]

Reedvalve limiters is not same 20 vs 30hp.

[@edsone11]

Unfortunately this cannot be done 20- 35 .

[@Rodbender-n3t]

Hey just fyi the timing is different also need to open up reed stops. Great stuff here

[@Bigtime_mcalpine]

Thanks - how do you mean “open up the reed stops?”

[@randyroth383]

​@@Bigtime_mcalpine no need to touch reeds 🙃🕵️

[@randyroth383]

15 pitch 30 n up 20 hp 11 12 pitch

[@todd7486]

your nails are longer than I've ever seen on a male before......???

[@gary-rf1co]

You obviously don’t know what you’re doing, the 35 block is completely different than a 20! Absolutely erroneous information!

[@Bigtime_mcalpine]

@@gary-rf1co do your homework - this has been done many times on this vintage of motor (I’ve done it on three myself).

[@gary-rf1co]

@@Bigtime_mcalpine lol! I repair them for a living! Good grief, you’ve obviously never had a block disassembled, and you certainly don’t understand the principles of internal combustion, especially a 2 stroke! You didn’t do your homework on me, i have videos that shows my skills! Libraries are free, yet you choose to remain ignorant! I’ll not comment any further on the matter, as i’m sure it’ll be futile!

[@dfabeagle718]

The 20,25,28,30,35 2 cylinder 31.8 cubic inch blocks are same same. The smaller 22 cubic inch older 18/20/25hp from the 60's/mid 70's is not the same block.

[@dylanpimp]

​@dfabeagle718 can this be done to 1996 johnson 20hp

[@Gadding.motormania]

Same block. I had 35hp. It hit 30.8knots. Then 35 broken so i buy 20hp and put 35hp carb and reedvalves in it. Speed was same 30.8knots