[Solved] Experiencing High-Speed Choking with NAC BP540-32B-V Brushcutter: Seeking Insights

Hello. I have a problem with the scythe above and I would be grateful if someone could help me. I bought this kose a year ago and I have problems with it. At the beginning, I set the idle speed on the screw because it was too low and it was going out. Then I set the air dose regulation because there was a lot of play on the button and it did not have its power. I do not remember the name in the carburetor, but I do not know, the shutter only rose to the middle of the hole, I set it so that after pressing the button on the max it would open to the end. But it still wasn't spinning, and it was humming as you added the gas. I got to the screw regulating the fuel dose, I played around with the settings for half a day. Well, it was great, it had power, it started to spin nicely. It was like this for maybe 30 minutes. And the problem. Adding gas for about 70-100% suffocates terribly. At max it goes out. It quickly stains the electrode in the candle black and as if it burns too little. I got to the carburetor screw again and I regulate the fuel dose and nothing. The fact that it leaks from the gasket at the tank, i.e. the filter from which the fuel goes through the pipe to the carburetor, I do not think it has any impact. Despite the fact that the factory seal looks like the dog torn it.

In this type of engine, pay attention mainly to the spark plug electrode, it tells about the composition of the mixture. In your case, the electrode is black, so it tells us that the mixture is too rich, i.e. too much fuel compared to air.
Apart from the carburetor, did you try to replace the candle because the original is probably some weak quinol, although NAC used to have very good engines assembled on walbro carburettors and branded candles.

gsekulski wrote:

Well, it was great, it had power, it started to spin nicely. It was like this for maybe 30 minutes. And the problem. Adding gas for about 70-100% suffocates terribly.

This behavior appears to be a clogged fuel tank vent. You can check it by unscrewing the fuel tank cap during problems with revolutions, if the revs calmer, you have the culprit. Often this air vent is found especially in new users of the equipment. The air filter should also be washed and soaked with fresh oil, if it is from a sponge.

Thanks for advice. The candle is Torch, i.e. standard in NAC. As for the traffic jam, I did not think, I'll check it tomorrow. As for this dirty electrode, I had a similar conclusion. Only cramps before was that when I reduced her dose a little, she was humming and was slowly going into rotation. Now, on the other hand, I am reducing its fuel dose diametrically, for example by 3/4 of a turn, and it screwed in nicely all the time, only to about 70%. Generally, I am surprised that the new scythe and nothing was adjusted in it. I bought such equipment for the first time.

Added after 15 [hours] 58 [minutes]:

Thank you for the advice, but it did not help. The scythe is still suffocating.

Check if the muffler is not clogged, it often happens when the wrong proportions are used.

Already the topic is mostly covered. That is, the screw in the gasifier responsible for the fuel dose must have clogged. I blew it and the scythe recovered, that is, it no longer suffocates at a higher speed. I only have a small problem because it is a bit weaker than it should be and it turns into too slowly. But tomorrow I will buy a new spark plug because I don't like the spark a bit, then I'll try to adjust it and see how it will be. Thanks for advice. By the way, these blackbirds have weak monofilament heads. I recommend the Oleo-Mac semi automatic. The head is a fairy tale, the vein stretches automatically without disassembling the head and looks solid.

Now the oleo-mac load & go heads are in, where you put the coiled line, put the ends through the holes, close it and it's ready

I have this load & go. Perhaps some new model has entered. In my case, I pull the line through the holes, then I twist the mushroom and winds itself up. Compared to the factory NACA, its operation is much more convenient and its performance looks much better.

These heads are used on the professional HQV and OM brushcutters on almost every model. Worth its price and it's hard to pull down.

I'd enjoy a Walbro carburetor more than a load & go head. If there is a Chinese carburetor, be prepared for frequent adjustments. What mix ratio do you do for this NAC?
By the way, I heard somewhere that it is good to soak the line before mowing a day (as if it tears less) has anyone tried this?

Mix 25: 1. I bought a new NGK spark plug and it helped as well. It's much better already. But still, when you add gas, this engine does not work like in a petrol saw, it does not turn in so smoothly. Although it's already bearable. And it crashes me some mixture into the air filter. Adjusting the fuel dose with a screw does not help. There is a float there, I don't know if he has any influence on it, some kind of tags or what. In general, avoid this model from a distance. I used to buy an Oleo-Mac and there was a guitar and once I was tempted to do so. Listen, can you use a normal carburetor for this? For example, such a Walbro or some diaphragm pump with a pump?

As for soaking the fishing line, are you talking about ordinary or armed? I used to tear quickly. The armed one endures much more.

gsekulski wrote:

There is a swimmer in there

If there is a realistic carburetor with a float, it's nice flowers. That's probably why the tank above the engine. The float is far from ideal, e.g. in an enduro motorcycle it is a tipping over and a flooded engine (the float works in a certain position).
This is what I am talking about an ordinary line, I know it for a long time, but a man is not prepared when his line runs out, so I did not test it personally.

There may possibly be a pump, not a float.

I don't know how to pump up with something like that

What are you. The carburetor is on the float. I am also not happy about this fact.

Hehe I saw a scythe once with a tank above the engine, but it was some very old model of the 80's - 90's. I can see that the trend is starting to come back.

Probably the producers want the convenience of adding fuel. I wonder if Makita also has a float?
You can try to speak to RychaT, maybe he had such "news" on the float in his hands and he will suggest something.

And that's interesting. As for the convenience, you say well because min. I was tempted to do so. But there is also a minus. Because if you have a tank at the bottom, usually the gasket and fuel lines are at the top of the tank. I have them at the bottom of it. I bought a mower in August last year and it is already leaking from this gasket. Here's another problem because this gasket is unusual, it's hard to buy. She is not on the allegro, the guy in the kos service also does not have her. I wrote to the website whether they would send it to me and I am waiting for a reply. As for its regulation, I bought NGK candles, yesterday I improved the throttle cable, I raised the idle speed a little and it is much better. The power came back, maybe it was a bit too weak at the start. Let me tell you this, the plus is that the scythe is very strong when you set it up and it fires nicely. When you mow it all flies in the air. But the harness, head and adjustments are a failure.

Hello, I also have this scythe for a year and I also have a problem with entering the revolutions after adding gas, I choke and smoke like crazy, only after a while it comes into revolutions when it burns the fuel bearing, the revolutions are also not maximum, so the power is the same and sometimes it happens that he plaited the grass. When I set the tap more or less in the middle, it was a bit better, after sharp gassing, it reached maximum speed and went as it should. It seems to me that the mixture is too rich and the dose of fuel and that I choke the bio cannot burn it, after unscrewing the air filter, the whole carburetor inside is wet so that gasoline is in it. Tell me where to find this fuel adjustment screw?

Listen for me it's the same. The mixture is too rich and it also blows me a bit with the air filter and it is difficult to set the fuel dose. For me it is very throttling, as if I changed the fuel dose and idle speed and it is much better but it is still not quite ok. yellow scrap. To the right you turn the sample and reduce the dose, and to the left you turn it on and increase it. Just don't screw it too tight. Or you unscrew the decanter completely. Unscrew the air filter cover and also see how the throttle opens when you press the button on the handle, I had to adjust it because it did not open enough. You also have a screw on the spring next to the carburetor. You regulate the idle speed with it, for me it was too low and the scythe could go out and it was hard to move from scratch. Alternatively, change the candles, the factory gave me a strange spark, I bought NGK and the scythe clearly recovered. Basically you have to play. One plus is the NACA service. I'm leaking from the gasket at the tank, I wrote an e-mail if they will send me the gasket because I am far from the site and it's a waste of time. I sent a photo of the scythe sign and the purchase invoice and they sent me the entire container on the same day.

Ok, great, thanks a lot, I will also write to them because I also have hell with this gasket, it's probably a standard

Added after 53 [minutes]:

For me, this dose adjustment screw was screwed to the max. And so I left A only underlined the gas line so that the throttle opens completely and now it goes better only at the beginning it has to burn excess fuel.aha and the tap is open only maybe 1 cm.

oh, well, and me too. I unscrewed this screw about half a turn. in the manual they say to turn around one and a half times and that's how I played with it. We will see how it will walk on yours. And I opened the tap to the max. As for the reservoir, write to them. I already got it. Much better. The new one does not have this gasket, but a permanent plastic connector. I mean, you slide the fuel line into it and there's a git. You've got the leakage problem solved for good. With the rest, he gives a photo. Besides, I did not notice that you are from Lodz, I was with you today so I would miss how I work for you.

Well, this reservoir is nice, I wrote to them the day before yesterday, that's a reply. Today they can send me a seal on delivery haha And if I have a guarantee that I would report door to door on their website or give it to the store where I bought it And if not, I wrote to the nearest service. You were lucky also put on the ngk candle today and it's a little better. We'll see how it performs when mowing. And I forgot to change places because now I live near Wadowice (Lesser Poland) so good that you weren't looking for me in Łódź hehe :-)

Added after 2 [minutes]:

I do not have anything about this screw in the manual. In fact, I have a nozzle and I do not think that it is possible to regulate it with something, if you do, you might have to buy a smaller nozzle. Unless I have a nozzle and you have a screw

As for the fact that I would drive up, I was just joking, I was just passing through.
Check PW.

However, I chose a less combinational version and went the easy way and ordered my brother-in-law to take the scythe to the service because he works in a city where the nac service is, let's see what they will carve because a week has passed yesterday and so far they have not called yet that the scythe to pick up

The service is waiting for the grass to grow Probably 2 more weeks will have to wait.

and what exactly have you given to the site?

Well, on Tuesday, it will be 2 weeks when I gave for adjustment and the fuel tank gasket because, as you know, the factory defect is the gasket and fuel leaks from under it. Today I called there and they are waiting for parts for a new tank, probably without the A gasket with a plastic lug and for a new carburetor, i.e. that one had to be factory defective.

adidas wrote:

and for a new carburetor, i.e. that one had to be factory defective.

I wonder if it will also be with a swimmer?

When you pick it up, let me know how it works on the new gas carrier. Well, it kind of mows for me, but once it turns into a good turn, once a little gay. Once idling, it works well and sometimes it has increased speed. It is better than it was at the factory, but still not good.

Of course, I will let you know