2 Stroke Outboard Engine - what is a 2 stroke boat motor?
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- čas přidán 5. 07. 2024
- Explaining the basics of 2 stroke outboard boat engines to answer many common questions like: How does a 2 stroke engine work? How can I identify a 2 stroke boat motor? What is a 2 stroke engine? Is a 2 stroke better than a 4 stroke? Why are some boat engines a two stroke? What does two stroke mean? Does a two stroke take special oil? How do you mix two stroke oil? Why do 2 stroke engines smoke?
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#2strokeengines #2strokeoutboards #twostrokeoutboard
Timestamps:
00:00 Introduction
00:36 Quick overview of outboard engine types
01:27 Why are they called 2 stroke?
01:53 What is different about a 2 stroke engine?
03:44 Why do we even have 2 stroke engines?
04:59 Can you still buy 2 stroke engines?
05:40 How to identify a 2 stroke engine
07:52 Special 2 stroke oil
08:14 Mixing the oil
09:07 Words of caution about 2 stroke engines and oil
10:05 2 stroke or 4 stroke - what's best?
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Also, 2 stroke engines make a lot of power for their size.
And weight!
Yeah, it's a simplier design but its real advantage is better power getting out of the hole and up on plane due to a powerstroke on each rotation of the crank as opposed to two revolutions.
I've often heard throttle response is faster, but I imagine in a smaller vessel, having an extra person a boat would negate any acceleration advantage.
One of the biggest advantages of 2 stroke engines not mentioned. In small boat applications, like car top boats, weight is paramount. You have to dismount and load the motor every time you get on the water. I have a 2 stroke 8 hp evenrude, 55lbs. An 8hp 4 stroke is over 100lbs. Huge portability difference.
I would rather have a 2 stroke over a 4 stroke. Less to go wrong with a 2 stroke. Instead of regular gas, I use a mid to high test gas. Also, I use real gas.
I enjoy my 2 stroke. 1980 70 hp evinrude. It's very dependable and easy to work on. I'll get a 4 stroke one day when I can afford it. Until then, 2 stroke it is. I do have my scavenging hose hooked up to my crankcase. That does help.
My first motor was a mid-80s Evinrude 90 hp. Once I learned how to start it, it was a great motor!
I am originally from europe , lived in USA for many years & now live in Mexico. I think Mexico is one of the final places that I know of, where you can still buy a brand new 2 x stroke outboard. Yamaha , Mercury & suzuki all still sell them & the commercial market here is full of them .
People also tell me they’re in the Caribbean
i have one of these that i just bought off of a 80 year man it is mint runs great said he used it 2 times has more power than my new mercury 5 hp i love it !
Nice score!
@@WayneTheBoatGuy thanks !
Thanks for another great video Wayne! This video helped me out huge! 👍
Simple explanation- thank you!
You're welcome!
You deserve many more subscribers mate.Here in Sydney Australia it's either Etecs or 4 strokes now sadly.
I bought my yamaha 30hp cv 2 stroke brand new that rattles like a bag of bolts but is extremely reliable, powerful and has never let me down in 11 yrs of ownership.
Yeah, I think in 20 years time there won't be many 2 strokes being used regularly anywhere.
@@WayneTheBoatGuy That's the way it's headed world wide
Slap some e-tec stickers on it and you’re set
@@evanspader6762 Hopefully in 20yrs time I’ve already had a meeting with the crematorium mate.
2 stokes have reedvalves. And the main reasons why some people choose 2 strokes over 4 strokes is because of weight and power. Especially on a boat that is small. Its important with a water cooled 2 strokes is that you run tcw3 oil. W= water and jeneraly it burns Ashless.
The W stands for water - good to know!
Just found your channel and love it! What you doing is superb
Awesome, thank you!
Thank for the info ! Very helpful !
Glad it was helpful!
Best weight to horsepower is two stroke. Best fuel economy is usually four stroke. Best idle and cleanest is the four stroke. the power curve is different with more weight and less top end in 4 stroke. Thanks Wayne!
Great video, thank you
Wayne, how late in production was the typical Evinrude (like the one pictured) 2 Stroke engine in the 5-9 HP range produced that did NOT have CDI (or similar) ignition? I want a "late mode" with points, condensers, and cylinder- individual coils as they are easier to fix on the fly and you can nurse a motor/boat home on one cylinder.
Don't know where else to put this comment, really like yur content I have learned alot from your channel
Thank you so much!
I personally think 2 strokes can still be quite reliable. Not necisarily more reliable than 4 strokes. Just depends how well built they were and if they were well maintained. I have a 1996 johnson 6hp outboard that is quite reliable. I also have a 1986 evinrude 4hp that never let me down. Some 2 strokes were actually built super well. I also really like the fact that they have great power to weight ratio. And the cost to purchase a 2 stroke outboard engine is often a lot less than a 4 stroke with the same horespower. I'm not exactly a fan of how 2 strokes normally polute a lot more, but personally I don't see a lot of other downsides.
Nice video wayne.
Thanks 👍
Thanks!
Thank you!!
Do you know why medium/large 2 stroke outboards use the variable ignition timing as a power control when no other engine is set up like this?
I just bought a brand new six horsepower two-stroke for my 12 ft Jon boat I love it
Hangkai?
G’day Wayne. Great video, mate.
I’m deciding on whether I should get a 4/5hp four-stroke or two-stroke outboard? I’m just curious on your opinion.
It would be my first outboard, and I’d be placing it on a Jonny Bass Boat 100…
Thanks mate,
Dimitri
I personally only would get a 2 stroke if a really cheap used one showed up. If I was buying new, or relatively new, I'd go with a 4 stroke.
@@WayneTheBoatGuy, thanks for the reply. Your advice helps me put things into perspective. Much appreciated
I just bought a 1987 Evinrude 2.5 Excel from an 82-year-old man who used it very little. It was stored in his garage and hasn't been run in a few years but with two cranks it started right up, and I couldn't believe the power it had. This is a saltwater model and came with a regular steel gas tank and a plastic one that clips on the motor. Should I do any maintenance to it before I put it on my 13 ft. Old Town square stern canoe? Thanks for the video.
Also the fuel mixture is 100:1 (1% oil)
It's really cool that engines are being engineered to be better for the environment, and boaters like you appreciate these features! Also love the new guitar intro/outro music.
Yeah I think it's cool too!
I run 50/50 Avgas unleaded mixed with Pennsoil synthetic oil 😁 in my 91 Evinrude 15.
Having fewer mechanical parts, a 2-stroke engine means less carry weight and easier handling than a comparable 4-stroke engine.
I use left over gas from my boat that is mixed with Pennzoil Semi Synthetic marine 2 stroke oil (50:1) in my 4 stroke motorcycle all the time.
One reason is I like to have an empty 6 gallon tank to get the proper mix ratio of one pint of oil to 6 gallons.
In fact I do not like to run my 4 stroke motorcycle unless it has some 2 stroke oil mixed in the gas, because it keeps the carburetor slide from sticking etc.
The semi synthetic/synthetic 2 stroke oil burns clean, but I would only use at a limited amount on a vehicle that has a catalytic converter.
Also I have been told that marine 2 stroke oil should always be rated "TCW3".
My point is you can use a 2 stroke synthetic gas mix in a 4 stroke engine & it may actually be beneficial?
I doubt it's really beneficial. 4 strokes are designed to lubricate thoroughly without mixing with the gasoline and running any oil through there just makes more oily smoke.
@@WayneTheBoatGuy
I have no oily smoke when I use the 2 stroke gas oil mix in my 4 stroke motorcycle.
The synthetic or semi synthetic 2 stroke oil burns clean.
Also, the spark plugs in my boat are much cleaner too, since I switched to semi synthetic 2 stroke marine.
My motorcycle is an old Triumph with an old Amal Carburetor.
Unless you buy a new Amal Premier with a hard slide or have the carburetor Sleeved they are known to occasionally stick.
Sticking is due to any distortion in the carburetor & or the fact the slide & bore are made of the same soft material, which may not have been as much as a problem when we had lead in the gasoline.
Anyway using the 2 stroke mix eliminates any sticking of carburetor & is probably good for the valve seats too?
I have 63,000 miles on my Triumph & have been using the 2 stroke semi synthetic mix for years.
Zero smoke & it runs great!
Usually 4 strokers have it in big letters 4 STROKE on the engine cowling.They are also more quiet than the average 2 stroke.Cheers to all from Wet Westcoast Canada!
That is true - I have seen a few Hondas that say 4 stroke on them. Great points!!
One of the great things about a 4 stroke it won't burn down , A bigger 2 stroke can burn down easy, it takes one cylinder to burn lean or a air leak, you might not notice, I like to disconnect one sprak plug wire at time and see if its firing the same. I did not want to worry about it, 2,000 grand more I bought a Honda over a 2 stroke.
how do you change lower unit oil? on 2hp
There should be a drain plug and a vent plug on the side of the gearcase like on larger outboards, I would say....
You can distinguish 2 and 4 stroke very easy by starting it. If it is running smooth, regular, silent and sound like a lawnmower, it's a 4 stroke. If it's smokey, smelly, running unsmooth and irregular and sounds like a chainsaw it's a 2 stroke. Also by pulling you can feel it. If it has compression every revolution, it's probably a 2 stroke
How do you take off the top to access the pull cord
There are screws underneath that are accessed from below. Don't take off the center screw in the top!
You mentioned you had an Evinrude v4 2 stroke engine, can you explain this?. Isn't a v4 a 4 cylinder engine?, how can it be a 2 cylinder?. ty
I've had 3 Evinrudes and all of them are 2 stroke engines. My first boat had a 90 hp V4 (4 cylinders but still a 2 stroke engine) and a 6 hp Fisherman. The thumbnail for this video is an Evinrude 2 which is a 2 hp single cylinder 2 stroke engine.
Fuel Consumption is also a cost factor.. #ExtremeBoating
In the European Union it is also forbidden to sell new 2 stroke outboards on carburetors, because of the exhaust fumes - there is no conformity with the emissions standard. The injected 2 stroke are allowed, but after the halt of production on Etec outboards in 2020, there are almost no other alternatives (Tohatsu doesn't sell his injected 2 stroke engines in my country).
So if you had the opportunity to buy a brand new 2 x stroke over a four stroke for a 14 ft Rigid Inflatable, which one would you buy? And secondly I hear about the fuel consumption of a 2 stroke , so if I go out pottering about on my RIB with a 25hp 2 stroke do you think my fuel consumption would be more than 6 gals a day ( that's what my tank holds !)
Personally I would go for the 4 stroke so I wouldn't have to mix my gas and oil. As far as fuel consumption, it really depends on many factors like how hard you have to run it to get out and back, whether the carb is in good shape, if it's running rich and how long you're actually out. I had an Evinrude 90 that used more fuel than my 5.7 liter V8 Volvo Penta uses.
It all depends on how much you use it if you use it a good bet you’re going to use a lot of fuel but two-stroke for the way to go I don’t look out for fuel consumption I just get out there and run it
Can't you tell if its a 4stroke cuz it had a separate cap for oil and a dipstick?
Often those are under the cowl and many people don't realize that 2 strokes don't have them.
I have a larger boat with inflatable dinghy. The weight difference of a 2 vs 4 stroke is huge when I have to lift the motor onto the transom of a dinghy with a wet floor and plenty of stress on my back. A 15 hp 2 cycle Mercury weighs 74 pounds and a 4 stroke is 125 pounds. The 2 stroke at 74 pounds is still manageable to mount on the transom by one person (barely) The 124 pound 4 cycle needs two people and there is not enough room for two people.
You need to be careful if you retrofit a smaller boat with 2 cycle engine(s) as the weight difference will change the performance.
Good points
Which one is quieter?
4 strokes are quieter than 2 strokes
There’s just something about a 2 stroke outboard. I have a 97 Yamaha 15hp and it’s never let me down
Nice. They are simple engines!
Damn straight bro
I ran my 2 stroke for 20 min or so without gas (thinking it was a 4 stroke). I’m new to all of this and have no one to show me. I rely on videos like these to learn. The motor obviously ran poorly, but it didn’t cease up or blow anything. What’s my next step?
Dang. Hopefully it's still ok. I would spray some lubricant (engine fogger or some other lubricant) in through the spark plug hole and maybe into the carb and then run it on 50:1 mix and hope for the best. Sometimes these things can take a little abuse... other times, not so much.
@@WayneTheBoatGuy thanks for the reply. That’s what I ended up doing. It runs, just needs a lot of adjusting. Still getting way too much fuel.
Don't you mean you ran it without oil in the gas?
It is depressing to me that the government has to create new laws to restrict activities like boating. Of course each law will have big dollar penalties for violation. Your last two videos hit upon the new restrictions: cut off switches and now two strokes. When will it end?
Yea but sometimes the govt needs to get involved because a lot of people don't care about pollution or carbon emissions. I was in China and some cities the only vehicles allowed now are electrical. The pollution still happens at the power plants by not inside the city
Funny you say that, they're still for use on a commercial level I bet though..look into it?
When you send your entire government into the desert.
also weight difference!
I don't know about the legality of selling new 2 stroke outboards in canada, but I think it's legal. They sell these new chinese 2 strokes online on ebay and amazon. But maybe it is just not enforced.
Yeah it's the same in the US - I see Hangkai 2 strokes on Amazon, but none of the major brands sell them.
I think they require LESS maint. then the 4 strokes &hey are much lighter which is great on a tiny boat !!!!
I will take my 2stroke Nissan 9.8 all day long, rebuild cost around 450 bones, but she is money all day, and I'm sure she will go another 15 years with no problem, btw she didn't need the rebuild
Many of them will last several years!
What the heck was that building in the middle of the wire
*water 9:49
A lighthouse.
repair shops don't work on 2 stroke anymore
A2 stoke is lighter. And easier to work on. I only use vintage outboard motors.
Two-stroke engine has way more power and acceleration than a four stroke twice the power strokes in the same amount of revolutions is why that’s why it usually takes twice the size 4 stroke to equal the same size two-stroke in Performance.
And why I love 2 over 4 stroke. Plus more reliable. Way more snap on takeoff.
All the old 2 strokes like a mercury 115 6 cylinder or any multicylinder 2 stroke. Here's the problem. If you don't clean the carbs in the spring, on a 66cyl mercury you have 3 carbs. 1 per. 2 cylinders. I slightly clogged jet in 1 carb that cylinder or those 2 cylinders with slowly starve for fuel n oil. You won't notice lack oof performance right away.by the ti.e you realliize what's happening you pull out the plugs to inspect n you'll have 1 or 2 silver plugs. You cooked 1 or 2 pistons. Every summer somebody you know goes out for 1st ride, you blow your engines, it's already too late. 115h.p. about 10 grand. That doesn't happen to 4 strokes. By the time you realize there's a problem, you need a powered. Same problem with snowmobes and the old Yamaha rd400 2 strokes. Expensive and embarrasing.
And who wants to pull carbs every year and clean them? Imagine 4 or 6 carbs.
@Brian Harris don't clean. Yarbs? The second tou feel a. Little hesitation you already melted a piston or 2!
@@davevangemert9853 Agree. Blew up a 150 Optimax.
We can buy and sell 2 stroke engines in Australia
Can you buy brand new 2 strokes there?
Nah Wayne they were banned from new sales in 2018
2 strokes are a lot lighter , on a small boat makes a big difference, my opinion 🤔
2 stroke for a smaller boat 4 stroke for a bigger boat.
A 9.9 4 stroke is about twice as heavy as a 9.9 2 stroke
Yeah weight can be an issue!
the environmental impact of manufacturing of electric batteries is greater than the pollution of running a gas engine for 30 years mostly due to the mining of lithium not to mention most of the world makes its electrisity by burning coal which is worse than running gas so electric is not a sustainable future there not to mention range because of these 2 things I will hold onto my gas until hydrogen hits boat motors. Most of the pollutions is done by the elites with the factories and their private jets ect but do you see them cut back. They want everyone else to make changes and think they are exempt. in the grand sceme of things the person going to the lake to just fish or have a ride on the boat is barly going to have an impact. They also should look at getting on backs of the pollution capitals of the world like china and india before restricting in the countries that barly add to polution.
Petrol Car (4 Stroke) wil b Ban frm 2035
Sooner or Later 4 Stroke Marine Engine wil b Ban 2
All Manufacturer ve 2 Revive 2 Stroke Engine
Or aftr few yr we wil b buying Tesla Boat
what a waste of 13 minutes. according to you, you must take somebody else's word about the engine type. I'm guessing somebody could tell you it's a 3 stroke and you would just take their word for it. Please direct me to a channel where they can tell by looking at the motor.