Youngest daughter filled up petrol tank with dirty water thinking it would be helpful to daddy. Your video helped us get motor going again in one hour. Thanks.
I have the same problem I have heard that moving the sir clip up makes the engine run Richer ie more fuel in the engine. When I throttle to full throttle under load the engine dies should I move the sirclip down to the very bottom of pin ? Any help would be really appreciated thanks
I’m having same issue with my 3.3 Brad. According to his previous post yes, moving the circlip all the way to bottom shortens the mixture needle. He was having the same problem with bogging at full throttle…. did you try this adjustment??
Is there any way to adjust the throttle on these carbs? I’ve got a brand new one in a box but the throttle doesn’t open as wide as the one that’s on the engine.
Hi mate, there is a way to adjust the mixture, don’t think there is one for the amount the slide raises. For mixture there is a little pin under the slide that you can place in about 3 positions when you have unscrewed the slide from the carburetor. what is wrong with the old one?
Good video. I have a Mercury 3.3. Just above idle and quarter throttle it seems to have a misfire but above that it runs smooth. Any idea what it could be as I bought the unit new and it's only 14 months old. Someone told me that 50:1 oil mix may be a bit rich for low revs but that's the manufacturer's spec.
Hi Peter, Very normal for these to have a flat spot or misfire as you throttle up, all of the 20 or so I have had are like that. In saying that it should rev through the flat spot within a second or two. The reason is they have a fixed timing and it’s set advanced - more for full throttle (the 5hp tohatsu built Mercury and 5hp tohatsu Are exactly the same with the same flat spot or miss) If it is running at full throttle sweet and also idling fine then you should be fine. Try throttling up slower so the motor has a chance to rev up enough to match the timing with the fuel entering the motor. Check the vid I put up on the 3.3hp Mariner (same motor) I throttled up to about 1/2 then full from there after it caught up. Or just don’t worry and know it’s what they do, they are great little motors, I have two at the moment and a 5hp tohatsu as well. Wow, I crap on, hope this can help you. Cheers
Hi Peter, I just had a tohatsu 3.5hp two stroke (same as the 3.3hp Mercury) with the same issue but would die out if I went full throttle from idle, not just a flat spot, it would actually stall. Found that the mixture needle in the carburetor slide has a few adjustable slots so you can adjust the mixture. Very easy fix, I just moved the circlip all The way the the bottom, making the mixture pin shorter. Runs sweet now with no flat spot or stalling. Very easy to address as well, don’t even need to remove the carburetor, only undo the slide. It is something you can get your service guys to have a look at. If you decide to do it yourself, take some pics as a reference as to how the slide goes back together before you remove the spring etc. Cheers,
Great video. I recently bought one of these motors and tested it. It idles perfectly in and out of gear. Run at about 1/3 throttle fine in and out of gear. However when at close to full throttle in gear under load it dies. Any tips to fix this?
I would definitely start with a carburetor clean. If that doesn’t sort it, I would clean out the little fuel strainer behind the fuel on-off tap. Make sure fuel is flowing freely to the carburetor, there is another little strainer in the fuel tank. Hopefully it just needs a carburetor overhaul. Another issue that can course what you are describing is overheating. Is the impeller new? Also very easy for the water gullies in the head to fill with salt which will overheat the head. Is there water coming from the tell tale while you are underway? Still hope it’s just a carb clean for you mate. Cheers
@@25hpboatracerman Hi, so I followed all these tips and did a carby clean etc. Found a few things wrong (the brass fork part that the float moves was bent weirdly so I bent it straight, the fuel tap was leaking so I took it apart and re installed the seal, the carb was dirty so I cleaned it well). After a test run all is very good. Idle and full speed under load was perfect and never stalled. One issue that remains is that after using it for about 20minutes I came back to the beach and turned off the motor then tilted slightly and the carb was leaking quite a lot. Am I doing something wrong? It didn’t seem to leak when in use or when tilted up before start. Thanks
Hi mate, Sounds like the brass float arms. They are supposed to be bent so that the float shuts the fuel off when the float bowl is full. The arm holds the float in the correct position so that when the bowl is full of fuel it floats up and pushes the fuel shut pin into its seat. If the arms are too straight the shut pin will not shut the fuel off when the bowl is full and fuel will run out the carburetor. Ok, so pull the carb apart and make sure that she. The float is in the up position (as if it had floated up) it pushes the pin into its seat. If the float hits the carb body before the pin is seated it is set up wrongly. Cheers
@@25hpboatracerman Thanks. Sorry I meant one arm was bent a lot lower than the other so I made them even. Thanks I’ll give that a try. I did read that some people who own these say you have to run the carb dry before tilting up.
Youngest daughter filled up petrol tank with dirty water thinking it would be helpful to daddy.
Your video helped us get motor going again in one hour. Thanks.
Glad the video helped mate.
Dirty water is not that helpful, pretty funny though.
Happy you got it all running again.
P.S to comment below. I have had an oiled up plug and replaced it. Low revs a bit better but not eliminated.
Love all ur video sir..
Thankyou bro
Same as my old Johnson 3.5 hp too.
True
Mine stalls at idle i cleaned my carb twice did i missed something?
Raise the idle stop setting.
Or a fuel line issue or a blocked fuel filter (behind the fuel tap)
Cheers 🍻
Aussie Boat Guy 😎
I have the same problem I have heard that moving the sir clip up makes the engine run Richer ie more fuel in the engine.
When I throttle to full throttle under load the engine dies should I move the sirclip down to the very bottom of pin ? Any help would be really appreciated thanks
I’m having same issue with my 3.3 Brad. According to his previous post yes, moving the circlip all the way to bottom shortens the mixture needle. He was having the same problem with bogging at full throttle…. did you try this adjustment??
Is there any way to adjust the throttle on these carbs? I’ve got a brand new one in a box but the throttle doesn’t open as wide as the one that’s on the engine.
Hi mate,
there is a way to adjust the mixture, don’t think there is one for the amount the slide raises. For mixture there is a little pin under the slide that you can place in about 3 positions when you have unscrewed the slide from the carburetor. what is wrong with the old one?
Good video. I have a Mercury 3.3. Just above idle and quarter throttle it seems to have a misfire but above that it runs smooth. Any idea what it could be as I bought the unit new and it's only 14 months old. Someone told me that 50:1 oil mix may be a bit rich for low revs but that's the manufacturer's spec.
Hi Peter,
Very normal for these to have a flat spot or misfire as you throttle up, all of the 20 or so I have had are like that. In saying that it should rev through the flat spot within a second or two.
The reason is they have a fixed timing and it’s set advanced - more for full throttle (the 5hp tohatsu built Mercury and 5hp tohatsu Are exactly the same with the same flat spot or miss)
If it is running at full throttle sweet and also idling fine then you should be fine.
Try throttling up slower so the motor has a chance to rev up enough to match the timing with the fuel entering the motor.
Check the vid I put up on the 3.3hp Mariner (same motor) I throttled up to about 1/2 then full from there after it caught up.
Or just don’t worry and know it’s what they do, they are great little motors, I have two at the moment and a 5hp tohatsu as well.
Wow, I crap on, hope this can help you.
Cheers
@@25hpboatracerman Thanks for the information. Much appreciated.
Too easy mate,
Also 50 to 1 outboard two stroke oil fuel ratio is totally fine and what I use.
Happy boating
Hi Peter,
I just had a tohatsu 3.5hp two stroke (same as the 3.3hp Mercury) with the same issue but would die out if I went full throttle from idle, not just a flat spot, it would actually stall.
Found that the mixture needle in the carburetor slide has a few adjustable slots so you can adjust the mixture.
Very easy fix, I just moved the circlip all The way the the bottom, making the mixture pin shorter.
Runs sweet now with no flat spot or stalling.
Very easy to address as well, don’t even need to remove the carburetor, only undo the slide.
It is something you can get your service guys to have a look at.
If you decide to do it yourself, take some pics as a reference as to how the slide goes back together before you remove the spring etc.
Cheers,
@@25hpboatracerman Thanks. I'll give it a go.
Great video. I recently bought one of these motors and tested it. It idles perfectly in and out of gear. Run at about 1/3 throttle fine in and out of gear. However when at close to full throttle in gear under load it dies. Any tips to fix this?
I would definitely start with a carburetor clean.
If that doesn’t sort it, I would clean out the little fuel strainer behind the fuel on-off tap. Make sure fuel is flowing freely to the carburetor, there is another little strainer in the fuel tank.
Hopefully it just needs a carburetor overhaul.
Another issue that can course what you are describing is overheating. Is the impeller new?
Also very easy for the water gullies in the head to fill with salt which will overheat the head.
Is there water coming from the tell tale while you are underway?
Still hope it’s just a carb clean for you mate.
Cheers
@@25hpboatracerman thanks for the help! I’ll try those steps. Cheers
@@25hpboatracerman Hi, so I followed all these tips and did a carby clean etc. Found a few things wrong (the brass fork part that the float moves was bent weirdly so I bent it straight, the fuel tap was leaking so I took it apart and re installed the seal, the carb was dirty so I cleaned it well). After a test run all is very good. Idle and full speed under load was perfect and never stalled. One issue that remains is that after using it for about 20minutes I came back to the beach and turned off the motor then tilted slightly and the carb was leaking quite a lot. Am I doing something wrong? It didn’t seem to leak when in use or when tilted up before start. Thanks
Hi mate,
Sounds like the brass float arms. They are supposed to be bent so that the float shuts the fuel off when the float bowl is full.
The arm holds the float in the correct position so that when the bowl is full of fuel it floats up and pushes the fuel shut pin into its seat. If the arms are too straight the shut pin will not shut the fuel off when the bowl is full and fuel will run out the carburetor.
Ok, so pull the carb apart and make sure that she. The float is in the up position (as if it had floated up) it pushes the pin into its seat. If the float hits the carb body before the pin is seated it is set up wrongly.
Cheers
@@25hpboatracerman Thanks. Sorry I meant one arm was bent a lot lower than the other so I made them even. Thanks I’ll give that a try. I did read that some people who own these say you have to run the carb dry before tilting up.