Why Does A Chainsaw Stall When You Press The Gas?

Hello! If you find yourself on this page, then, apparently, your chainsaw stalls when you press the gas, and you want to know why it happens and what to do about it. Well, I’ll try to help you with this problem by sorting out the most common causes of such a misfortune, as well as methods for eliminating them.
To begin with, I will immediately write to new users that many chainsaws require the engine to warm up at idle for about one minute before work. While the engine is warm, the saw may stall when adding gas.

So, if a heated chainsaw can idle, but stalls under load, this means that:

  • incorrectly tuned or clogged carburetor. the most frequent case;
  • it does not have enough air, the consumption of which increases dramatically with increasing speed. this means that the air filter is dirty (a rare case, as the filter becomes soiled gradually, so the user first notices the loss of power);
  • it lacks fuel, the consumption of which also increases with increasing speed. this means that the fuel filter is dirty (also an infrequent case);
  • Well, and the most unpleasant case is if there is excessive friction between the piston and the cylinder wall due to the lack of oil in the fuel mixture. after this work of the chainsaw, you will most likely fly into the repair of the piston group, as there are tears on the piston and cylinder walls that prevent saw operation.

Little oil in the fuel mixture.

First, we analyze the most unpleasant case. Why? Because before doing the manipulations with filters, it is better to make sure that the oil and gasoline are mixed in the right ratio.
Here, however, it is worth noting that if your saw repeatedly (for example, ten times) was wound up by you, but continues to wind up, and then stall again with an increase in revolutions, then apparently everything is fine with the fuel. Otherwise, it would have only ceased to start at all.
But still, I recommend to immediately dispel the slightest doubt about the quality of the fuel, as soon as the saw you stalled when you set the speed for the first time. Because, if the reason is in the fuel, then, as already stated above, you can get too costly repairs. And so, it can still do. To dispel doubts is to drain the old fuel from the tank and pour in freshly prepared oil, in which oil and gasoline are mixed in the correct proportion.
The correct ratio is better to look in the instructions for the saw. If it is lost, then we look at the ratio on the packaging of oil. It is usually 1:50 or 1:40. If the oil is used “non-native” (well, for example, for Stihl chainsaws, Stihl is also a “native”), then I recommend using a proportion of 1:40, even if the oil is written 1:50.
For an exact dosage, I use a medical syringe and measuring container, in which one liter of gasoline can be measured. I pour a liter of gas into a container, type 25 cubes (at 1:40) or 20 (at 1:50) oil cubes in a syringe and add it to gasoline.
After preparing the new mixture, pour out the previous mix from the tank, in which we are unsure, and pour the freshly prepared one.
Now that you have done everything to dispel any doubts about the quality of the fuel proceed to further action.
As I wrote above, when there is a shortage of oil, seizures can form on the piston and the walls of the cylinder. and they almost always create. If you are lucky and the badass does not appear, then with a new fuel mixture prepared in the correct ratio, the chainsaw should start working normally.
If a teaser appeared, then the saw can start and stall several more times, after which it will cease to start at all. In such a situation, I sympathize with you, because, most likely, now you will need to make a replacement for the piston group, which will be very expensive.
If the saw, as before, starts and stalls at high speeds, then we carry out manipulations with filters.

Dirty air filter.

Making sure the air filter is dirty is pretty easy. You need to remove it and start a chainsaw without it. if the saw is working normally, then it means it’s in him, and you need to change or wash it, depending on its type. And do not be afraid that the chainsaw will work for some time without protection from dust. if there is no dust cloud around you, then everything is in order.
So, remove the air filter. To do this, you need to remove the cover from the back top of the chainsaw, which is fastened either with screws or just with some lock that you need to turn or unlatch.
If the saw is regularly working when the filter is removed, then it means it is dirty.
The air filter can be felt or nylon. The first one looks like cotton wool, and the second one looks like a fine mesh of nylon threads stretched over a plastic case. You need to change the felt to a new one, but you can wash the nylon in soapy water, dry it, and put it in place.
Well, then quietly use the chainsaw.

The fuel filter is dirty.

If the option with an air filter did not suit you, then try changing the fuel one. It is located in the gas tank and is attached to a hose through which fuel is withdrawn from the tank.
This hose must be carefully pushed to something and remove from the gas tank its edge, on which the filter is fixed. Here, the option of working without a filter, as in the case of air, it is better not to apply, since you can not know for sure if there are any unnecessary impurities in the fuel.
Therefore, we change the fuel filter to a new one and try to work. If everything is fine, then congratulations. you have found the reason.

Cleaning and adjusting the carburetor.

If all of the above did not help, then, requires tuning or cleaning the carburetor. It is not recommended to do these procedures on your own, as most often such attempts still end with a trip to the service. So it is better to immediately go there and do not disassemble anything on your own.