Last fall I laid up my Nissan 5hp dinghy motor. I fogged the carb & cleaned it up. I've owned it (new) for about 4 seasons and it has no more that 40 hrs on it. This spring when I started it in the barrel, it would only start and stay running with the choke pulled. When pushed in, it would cough and stall. The shop first said "dirty carb". It has completely fresh gasoline. They disassembled and reassembled 3 times with no change in symptoms. Now they are replacing the carb ($100+). Has anyone experienced this before? Is this the correct remedy? It's a fairly simple engine (1 cyl). I don't seem to have much choice for such a young engine. Thanks.
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Same type of problem.
Paul: Our Nissan 15, had the same type of problem. Just a crapped up carb. Ran carb cleaner, sprayed choke cleaner etc. thru the system. Changed plugs twice and it finally runs OK. I'd play with it for a while before I'd invest in a Carb.
Paul: Our Nissan 15, had the same type of problem. Just a crapped up carb. Ran carb cleaner, sprayed choke cleaner etc. thru the system. Changed plugs twice and it finally runs OK. I'd play with it for a while before I'd invest in a Carb.
D
David
Carb
Paul I had the same problem with a one cylinder Nissan (Tohatsu makes them). You have probably already tried this, I found that the internal gas tank filter was clogged. I took off the tank, cleaned it and replaced the fuel hose.
Paul I had the same problem with a one cylinder Nissan (Tohatsu makes them). You have probably already tried this, I found that the internal gas tank filter was clogged. I took off the tank, cleaned it and replaced the fuel hose.
J
Jim Maroldo
More carb...
I just cannot believe these guys! The carb on that engine is so VERY, VERY simple! There should be absolutely no need to replace it unless you smashed the thing. As has been mentioned, it could be a clogged filter, or simply a clogged jet somewhere in the carb. If you disassemble the carb and study the body carefully, you can trace all of the drillings and ports and jets in there. Blow through each passage with either compressed air, or Gumout spray (watch your eyes!). If you take your time (something most mechanics cannot afford to do), you will find the obstruction. I can't remember for certain if that carb has it, but some of these carbs have a tiny hole drilled in the side of the main jet tube (that's the tube that sticks down into the float chamber with the brass jet screwed up inside it). If that hole is clogged - and it's easy considering how small it is - you'll get the problem you mentioned. Anyway, check it over very carefully. If you see a dark speck on the surface of the tube, it probably is that hole. I cleaned mine out with a piece of wire off a wire brush. Another thing to consider is to make sure the float valve is working and that it is adjusted correctly. If there isn't enough fuel in the bowl, then you'll also have the situation indicated. Just as an anecdote, I had a problem with my Nissan 5HP last spring. 3 people ( BOAT MECHANICS!) pulled the cord until they were spent, and noone could get even a POP out of it! The guys tried 2 spark plugs, pulled the carb apart twice ("THESE ENGINES ARE SUCH GARBAGE!", changed the gas ( "YOUR GAS IS NO GOOD; YOU SHOULDN'T USE THAT JUNK OIL", ETC.), flooded it with starter fluid, disconnected the kill switch (even though it had a spark!). They then suggested I should give up and get a Mercury engine because these damned things were "garbage" (Funny thing: the Mercury 5 IS the Nissan/Tohatsu with different paint!!!!!). Anyway, after everyone was done tearing me and my engine apart, I took it home. Turned out the piston rings were gummed up and the engine didn't have enough compression to fire the fuel! I installed new rings, a couple of gaskets, and it's been running since with the OLD spark plug, my cheap 2-stroke oil from Home Depot, and regular gas. Cost me about 25 bucks! Good luck! Jim Maroldo s/v: Lil' Wass Ett
I just cannot believe these guys! The carb on that engine is so VERY, VERY simple! There should be absolutely no need to replace it unless you smashed the thing. As has been mentioned, it could be a clogged filter, or simply a clogged jet somewhere in the carb. If you disassemble the carb and study the body carefully, you can trace all of the drillings and ports and jets in there. Blow through each passage with either compressed air, or Gumout spray (watch your eyes!). If you take your time (something most mechanics cannot afford to do), you will find the obstruction. I can't remember for certain if that carb has it, but some of these carbs have a tiny hole drilled in the side of the main jet tube (that's the tube that sticks down into the float chamber with the brass jet screwed up inside it). If that hole is clogged - and it's easy considering how small it is - you'll get the problem you mentioned. Anyway, check it over very carefully. If you see a dark speck on the surface of the tube, it probably is that hole. I cleaned mine out with a piece of wire off a wire brush. Another thing to consider is to make sure the float valve is working and that it is adjusted correctly. If there isn't enough fuel in the bowl, then you'll also have the situation indicated. Just as an anecdote, I had a problem with my Nissan 5HP last spring. 3 people ( BOAT MECHANICS!) pulled the cord until they were spent, and noone could get even a POP out of it! The guys tried 2 spark plugs, pulled the carb apart twice ("THESE ENGINES ARE SUCH GARBAGE!", changed the gas ( "YOUR GAS IS NO GOOD; YOU SHOULDN'T USE THAT JUNK OIL", ETC.), flooded it with starter fluid, disconnected the kill switch (even though it had a spark!). They then suggested I should give up and get a Mercury engine because these damned things were "garbage" (Funny thing: the Mercury 5 IS the Nissan/Tohatsu with different paint!!!!!). Anyway, after everyone was done tearing me and my engine apart, I took it home. Turned out the piston rings were gummed up and the engine didn't have enough compression to fire the fuel! I installed new rings, a couple of gaskets, and it's been running since with the OLD spark plug, my cheap 2-stroke oil from Home Depot, and regular gas. Cost me about 25 bucks! Good luck! Jim Maroldo s/v: Lil' Wass Ett
P
Paul Akers
Thanks, guys.
You all have great suggestions. Now, I'll have to go to the shop tomorrow, anyway. They promised me on Saturday that it'll be ready with the new carb on Monday. I told them to save the old one for me. Unfortunately, if any of you are right,and I don't doubt that one of you is, then I've been screwed. The people at the shop have been nice through all this for the last 2 weeks. They immediately said it was a gummed up carb, but they had never found the problem. I was using fresh gas, and they have been running it with their own gas, also.
You all have great suggestions. Now, I'll have to go to the shop tomorrow, anyway. They promised me on Saturday that it'll be ready with the new carb on Monday. I told them to save the old one for me. Unfortunately, if any of you are right,and I don't doubt that one of you is, then I've been screwed. The people at the shop have been nice through all this for the last 2 weeks. They immediately said it was a gummed up carb, but they had never found the problem. I was using fresh gas, and they have been running it with their own gas, also.
R
Ray Bowles
Very, very rarely do carbs go bad! Especially
when care has been taken as in your case. Carbs are always blamed as most people don't quite understand that a carb represents either too much fuel or too little fuel when there is a problem. Your carb is dirt simple and you say it needs the choke to run. That means no fuel to the engine. It might just be there's no fuel to the carb to fed the engine. To replace a carb that has been overhauled many times is to offer up another $100 bill in an attempt to guess until we find the problem. Usually, unless the owner runs out of money, after replacing enough parts the right problem will be found, by accident. What ever happened to the days where mechanics could trouble shoot the problem and causes and then correct the one causing the problem? This skill is used before any work is done. Good luck, but it might require another loan from the bank. Ray.
when care has been taken as in your case. Carbs are always blamed as most people don't quite understand that a carb represents either too much fuel or too little fuel when there is a problem. Your carb is dirt simple and you say it needs the choke to run. That means no fuel to the engine. It might just be there's no fuel to the carb to fed the engine. To replace a carb that has been overhauled many times is to offer up another $100 bill in an attempt to guess until we find the problem. Usually, unless the owner runs out of money, after replacing enough parts the right problem will be found, by accident. What ever happened to the days where mechanics could trouble shoot the problem and causes and then correct the one causing the problem? This skill is used before any work is done. Good luck, but it might require another loan from the bank. Ray.
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