Upgrading a 20hp Johnson Evinrude to a 35hp
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- เผยแพร่เมื่อ 10 ก.ค. 2023
- This video gives you an idea of what’s involved in upgrading an 80s to early 90s 20 or 25hp to 30 or 35. Only two parts need to be changed out: the carb and the intake. The. You simply adjust the throttle linkage and you are done.
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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 !
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
Inner Exhaust Covers are different between the engines. Throttle Cams were also different
This is so helpful, thank you. I'm looking at doing this same thing to my 20hp '88. Where did you get the parts?
You need to be on the look out for part out engines at a discount.
What about re-proping? was it necessary too?
I did a lot of these motors 🙋🍿
What is the difference between a 30hp vs 35hp carburettor?
Hello, if someone could say what is the carburetor diameter of 20hp vs 35hp....thanks...
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
Really? Have you pulled the brass bar on any yourself? You’ve got me curious about what it’s for.
@@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 .
Would this work for a 2003 Johnson 25 electric start
Can you do it with a 97
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 ✌️
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
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.
@@Bigtime_mcalpine thx, does it matter if its a tru-hub exhaust or not?
@@Dudlushka I don’t know what that is but as long as powerhead is no different I would guess it should be fine
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?
@@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.
Did it run good after the install
Yep like butter.
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?
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.
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.
I capped the fitting on the intake mine works fine but I also switch the manual choke that came with my 35hp
Hey just fyi the timing is different also need to open up reed stops. Great stuff here
Thanks - how do you mean “open up the reed stops?”
@@Bigtime_mcalpine no need to touch reeds 🙃🕵️
15 pitch 30 n up 20 hp 11 12 pitch
your nails are longer than I've ever seen on a male before......???
You obviously don’t know what you’re doing, the 35 block is completely different than a 20! Absolutely erroneous information!
@@gary-rf1co do your homework - this has been done many times on this vintage of motor (I’ve done it on three myself).
@@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!