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What's up everybody, welcome to technicians Tuesday
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Today we are going over the number one reason that small outboards won't run, which is usually when we get them back out for the first time of the season
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This week's contest prize is going to be a Taco Marine LED T-top tube light
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Don't forget to subscribe to the channel and let's get these engines running. Now we're talking about engines that will run, but they won't stay running or they
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won't get wide open throttle. This means that they have good spark and a good spark plug in the
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cylinder. We need to start by making sure that the engine is getting good, clean fuel, and we
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aren't trying to make the engine run on old stale fuel from one or two years ago. I will tell you
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from experience that 90% of the time when this happens, there is something going on with the carburetor
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and we need to remove the carb and clean it. We have a 6 horsepower and a 9.9 horsepower
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but most of these small outboards have a very similar carb. As well as how the carb is bolted on
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there are usually only two bolts, most of the time a 10 millimeter that attach the carb to the engine
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There might also be another screw somewhere as well, holding it on. We'll take those bolts and the screw out
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and then whenever we drop the screw, we'll have to fish it out of the pan like this
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There will also be a linkage somewhere on the car, and then a couple of hoses attached to it as well. That we will need to remove
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After we get the hoses off, we can take the two bolts out or vice versa depending on what engine you're working on
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Then we'll have the carb in hand and we can take it to a nice clean area to work on it
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I like to do this on a clean white rag where we can keep all the parts and pieces nice and organized and visible
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Some people like to do this in a baking pan or something similar to keep all the pieces in one area
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Either way is fine, just that it is clean and organized so you don't run the risk of losing a piece or forgetting to put something back in
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For the 9.9, after pulling the bolts out, we can take the end
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air box off and then unhooked the linkage allowing us to remove this bracket in its pieces
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leaving us with the carburetor. You can dump out the fuel that is left in the bowl into a clear
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container or spill the rest on your rag, which is pretty much inevitable. Now it's just a matter
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of pulling the carb apart. We'll start by pulling the bowl off the bottom of the carb. For this
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engine, the bowl was actually really clean, with not much to see in it, and the six horsepower wasn't
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bad either. Your carb might be a lot dirtier than these, but if you have a plunger pump
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on your carb like this, make sure that it pumps. Clean the bowl and set it off to the side
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We need to check the float in needle valve next. Most carbs have the same float setting, and
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we'll just flip the carb upside down to check it. The float should be even with the side
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of the carb like this. That way, when the carb is full, the float will float up and shut off
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the needle and stop fuel from flooding out the carb. This is one of the locations that usually fails
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After pulling the float and needle off, we'll check the needle to make sure that the tip is not rounded over
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You want it to be in the shape of a triangle like this
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As long as that looks good we can set that off to the side and then begin pulling the jets out
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Depending on your carb, there might be one or two jets here
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One of them is a mid-range and one of them is a high-speed jet
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Sometimes they are plugged off or they have a small hole through them
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We need to take some contact cleaner and make sure that it is cleaned out
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It's nice to use a contact cleaner like Yamaha brake cleaner or this CRC cleaner
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That way we can visibly see that there isn't any obstructions blocking off the flow of fuel
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through it. It's also nice to use some compressed air to blow any kind of debris that you might find
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in it out. Then we can spray through this tube as well to make sure there isn't anything blocking it either
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We will be going through each and every jet this same way. We can pull the jets out and clean all of them out with the cleaner
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making sure there aren't any obstructions. This side of the carb is what you can call the fuel side of the carburetor
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and we'll flip it over to inspect the air side, which is another major point that you will find failure, blockages, or debris
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After taking the cover off, we'll inspect inside all of these passages here
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making sure that the gasket isn't torn, and then we can move on to spraying the contact cleaner through all of the little holes that are on this side of the carburetor
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You'll want to be careful because you can spray this stuff through one hole and it will come right out another straight at you
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So make sure you are wearing glasses when doing this. Whenever spraying the cleaner physically be looking around the carb to make sure that the cleaner is flowing through the passages and that there isn any blockages Once we have confirmed that all the passages around the entire car were cleaned and free of any debris we can begin putting it back
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together. We'll just put the top back on the air passage side, then flip it back
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over and install the fuel jets and the cap. After tightening them down, we can put
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the float needle assembly back on and tighten the screw holding it in place
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We can check the flow level one more time and then put the bowl back on and tighten it down
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Then put the air box and the bracket back onto the carb and we are ready to put this back onto
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the engine. We'll reattach the fuel feed hose and get our linkages back on and set before we attach the bolts
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and screws that hold the carb onto the intake manifold. Once we've got the hoses and linkages on, we can get the bolts started and tighten them down
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Then we can put the rest of the hoses and plugs back on and together
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Which brings us to the fun part, the technicians tag for this week's prize
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If you want a chance for the light, drop a comment below with a hashtag Tacos
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Make sure you're subbed and follow us on Instagram. Now let's fire these engines up
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Don't forget to prime up the fuel system and then hit that key switch or pull start it up
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If everything goes to plan, then the engine should fire right up. It might spit and sputter out once or twice until it gets the fuel flowing, but then it should
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settle down and idle just the way it should. You might have to make some minor adjustments to get the idle to settle out right where it belongs
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but we hope this gives you the confidence when it comes to cleaning out a carburetor
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We hope you enjoy your Tuesday night and look forward to seeing you next week
