This video has helped me out so much. Couldn`t get to the bottom of why mine would start and run. made myself a decaff tea and it now runs perfect. Cheers.
Great job diagnosing the carb issues and getting this thing running. Now you can move on to replacing the water impeller and housing since you ran this engine dry!!!! Never test your water cooled engine out of water. It doesn't take long to burn out the water impeller in the lower unit.
I bought a small sail boat just before xmas, and it came with a Mariner/Yamaha 4hp chucked in for free, the owner said it was seized, so i could just have it for scrap. The only part that seemed seized, was the gear selector, which eventually snapped off. I drained all of the stagnant 10yr old fuel, removed the power head and dismantled the gear selector parts, i knocked out the old seized parts, fitted the new selector, and re-assembled, fresh fuel/oil and the little beauty started on the 3rd pull.
Nice one! Good feeling fixing stuff like this. You see my part 2? I found a load of crap behind another cover on that engine. Part 2 will explain. Just thinking of reliability for you being out on the water.
@@penknifemonkey I`ll take a look at part 2 later, i`m in the process of rebuilding a Partner/Husqvarna ride on mower atm, it`s been a challenge without a manual, but i`m almost finished, funny thing tho, i was actually given it by the same person that sold me the boat, it was originally his fathers, but he`d bodged a few bits over the years, to the point when he`d just given up and bought new, tbh it`s been fun fixing it, and i`ll stick it on Ebay in the next week or so.
Got the same one, but I got springs and stuff inside the membrane pump. Did not see any when you take the Thing apart. Mine is running only in short bursts on full choke, and carburator is cleaned. So looking on CZcams for mor ideas 😁
Good video, I’ve just picked up an old mariner for £100! Definitely been neglected, stored outside so the stickers have faded but I've been running it with no apparent issues so far..
I did the same, still plodding on. Mariner 5hp two stroke, £200. Was starting, doesn't now. Wasn't pumping, impeller obliterated, and housing compacted with salt. Nice flow now from bottom leg, from impeller housing. Still won't pump. So it's powerhead, thermostat. If the lower leg is anything to go by, there's a big salt crystal removal job ahead. I have the same on starting. 21/05/21 Thanks!!
Hi great videos. I have the same outboard was wondering if you could tell me what brand and type of oil you use for the 50.1 mix is it semi synthetic or mineral the more info the better for me as im a newbie many thanks in advance
@@penknifemonkey what was the other issues with the outboard, been having the exact same problem with mine, pulled it apart, compression was low too, new piston, still wouldnt start, just got a new powerhead
Anyone know definitively what the differences are between the 4 and 5hp? Not guesses... so I know parts to get for an upgrade without inspecting a motor. Cheers!
Hello, I'm pretty sure. I have heard it a fair few times over the 20 years. The engine is the same, its the carb which is different. Two carbs same engine, one is more tuned. But as per your comment, I'm not 100% definite.
Hi mate looks like you know what you are doing I have a few questions any chance I could get in contact Frank If not 1 question is if I want to fix an external fuel tank to my motor same as yours lol do I just remove the plastic plug next to fuel cut off switch then run pipe from external tank to fitting on bottom off tank gear side ? Or anything else like a fuel pump needed any help be good complete novice 😂😂😅 Frank
2 stroke outboards generally run on 50:1, on new outboards some run them on 25:1 to help with the wear in. But due to emissions you cannot get a 2 stroke unless it's for commercial use (in the uk). I know a gardener who runs his Honda 4 stroke grass cutter on 2 stroke 50:1, more hours than a London taxi. Still works sweet.
@@penknifemonkey thank you for the reply! I've been searching but was unable to find any information for the Mariner 4. I checked the fuel tank today and the previous owner just put gas in without mixing so no use until I can drain the fuel tank.
@@brianknepp9229 it's the same as the Yamaha model so you are supposed to run it at 100:1 but I run mine at 75:1 picked one up for 150 euros in Ireland along with an 8hp Yamaha that wasn't pumping water
I have the same motor with the problem that it takes 10+ tries to start it and as soon as it starts it just goes out again after a couple of seconds... do you think the same cleaning will do wonders on my mariner 4hp 2 stroke? :)
Andreas Rheder I have the same engine I bought cheap. The needle valve was gobbed up and wasn’t allowing fuel to flow. Took the whole carb apart and cleaned it. And it runs great now
This video has helped me out so much.
Couldn`t get to the bottom of why mine would start and run. made myself a decaff tea and it now runs perfect. Cheers.
Sorry I went on for so long.. Bit long-winded! I did make a part two on the cooling.
Loved your video !! Fun !! Hope that Mariner is still going strong !!!
Is indeed! There is a part 2 by the way!
Great job diagnosing the carb issues and getting this thing running. Now you can move on to replacing the water impeller and housing since you ran this engine dry!!!! Never test your water cooled engine out of water. It doesn't take long to burn out the water impeller in the lower unit.
I bought a small sail boat just before xmas, and it came with a Mariner/Yamaha 4hp chucked in for free, the owner said it was seized, so i could just have it for scrap. The only part that seemed seized, was the gear selector, which eventually snapped off. I drained all of the stagnant 10yr old fuel, removed the power head and dismantled the gear selector parts, i knocked out the old seized parts, fitted the new selector, and re-assembled, fresh fuel/oil and the little beauty started on the 3rd pull.
Nice one! Good feeling fixing stuff like this. You see my part 2? I found a load of crap behind another cover on that engine. Part 2 will explain. Just thinking of reliability for you being out on the water.
@@penknifemonkey I`ll take a look at part 2 later, i`m in the process of rebuilding a Partner/Husqvarna ride on mower atm, it`s been a challenge without a manual, but i`m almost finished, funny thing tho, i was actually given it by the same person that sold me the boat, it was originally his fathers, but he`d bodged a few bits over the years, to the point when he`d just given up and bought new, tbh it`s been fun fixing it, and i`ll stick it on Ebay in the next week or so.
Got the same one, but I got springs and stuff inside the membrane pump. Did not see any when you take the Thing apart. Mine is running only in short bursts on full choke, and carburator is cleaned. So looking on CZcams for mor ideas 😁
You started it without the water muffs in place and thus will need to replace the water impeller now. Good job getting it started though.
Good video, I’ve just picked up an old mariner for £100! Definitely been neglected, stored outside so the stickers have faded but I've been running it with no apparent issues so far..
Might be worth checking the thermostat.. You will see in part two it was blocked.
Nice engine
I did the same, still plodding on. Mariner 5hp two stroke, £200. Was starting, doesn't now. Wasn't pumping, impeller obliterated, and housing compacted with salt.
Nice flow now from bottom leg, from impeller housing. Still won't pump.
So it's powerhead, thermostat. If the lower leg is anything to go by, there's a big salt crystal removal job ahead. I have the same on starting. 21/05/21
Thanks!!
Let me know how you get on!!
@@penknifemonkey Will do
Hi great videos. I have the same outboard was wondering if you could tell me what brand and type of oil you use for the 50.1 mix is it semi synthetic or mineral the more info the better for me as im a newbie many thanks in advance
See when you took apart the fuel pump and that spring came flying out, did you put the spring back in
Hi , which is the screws to tune and time on the carburetor
hello mate I have the same engine, can you determine the temperature of the water leaking from the engine? is it cold, warm or hot?
runing outboard without water you just burned water pump!!!
Ahh the art of 2stroke outboard whispering.
Not bad for the cash and work rodders 👍🏻
Thanks Matt! Things got interesting after this video. Found more issues! Ended up pulling it apart.
@@penknifemonkey what was the other issues with the outboard, been having the exact same problem with mine, pulled it apart, compression was low too, new piston, still wouldnt start, just got a new powerhead
I have the same motor what year is it do you know
Anyone know definitively what the differences are between the 4 and 5hp? Not guesses... so I know parts to get for an upgrade without inspecting a motor. Cheers!
Hello, I'm pretty sure. I have heard it a fair few times over the 20 years. The engine is the same, its the carb which is different. Two carbs same engine, one is more tuned. But as per your comment, I'm not 100% definite.
Hi mate looks like you know what you are doing I have a few questions any chance I could get in contact Frank
If not 1 question is if I want to fix an external fuel tank to my motor same as yours lol do I just remove the plastic plug next to fuel cut off switch then run pipe from external tank to fitting on bottom off tank gear side ? Or anything else like a fuel pump needed any help be good complete novice 😂😂😅 Frank
We’ll surprised the water pump still works ..,
i need help guys. I bought same engine but i dont know what is right oil mixture for this engine
50:1 mix,
@@penknifemonkey yeh with what type of oil ?
What is the gas to oil ratio on these? I have the exact same one but unsure about the mix
2 stroke outboards generally run on 50:1, on new outboards some run them on 25:1 to help with the wear in. But due to emissions you cannot get a 2 stroke unless it's for commercial use (in the uk). I know a gardener who runs his Honda 4 stroke grass cutter on 2 stroke 50:1, more hours than a London taxi. Still works sweet.
@@penknifemonkey thank you for the reply! I've been searching but was unable to find any information for the Mariner 4. I checked the fuel tank today and the previous owner just put gas in without mixing so no use until I can drain the fuel tank.
@@brianknepp9229 oh really, I hope to much damage has been done! That's mad.
@@brianknepp9229 it's the same as the Yamaha model so you are supposed to run it at 100:1 but I run mine at 75:1 picked one up for 150 euros in Ireland along with an 8hp Yamaha that wasn't pumping water
I have the same motor with the problem that it takes 10+ tries to start it and as soon as it starts it just goes out again after a couple of seconds... do you think the same cleaning will do wonders on my mariner 4hp 2 stroke? :)
Andreas Rheder I have the same engine I bought cheap. The needle valve was gobbed up and wasn’t allowing fuel to flow. Took the whole carb apart and cleaned it. And it runs great now
try making a decaff tea mate.
How much does this weigh ?
Not sure.. not that heavy. Being a 2 stroke it's manageable. Google maybe able to tell you.