You will need
- Screwdriver, tachometer, a technical passport of a chainsaw
Setting the carburetor of a chainsaw is to adjust the position of the nozzles. Typically, the carburetor has three screws for adjustment screw low speed jet screw needle valve high speed adjustment screw idle speed of the saw.
The first two screw regulates the ratio of fuel mixture and air, which is determined by the opening of the valve throttle. If you need to impoverish the mixture, turn the screw clockwise if mixture is necessary to enrich and to increase the number of revolutions the screw must be unscrewed by turning counterclockwise.
To adjust the idle speed use suitable screw. Turning it clockwise, you will increase the number of revolutions, while rotating the screw counter-clockwise the number of revolutions decreases.
After buying the saw for several hours of work you must save the settings made at the factory (there is a carb adjust for a richer mixture). You can then tune the carb yourself.
When adjusting, keep in mind that the screw rotation nozzle high rpm affect the power and frequency of rotation of the chain. The depletion of the combustible mixture leads to excess turnover and can lead the saw out of action.
After warming up the engine saw at full speed for a few seconds, turn the screw high speed jet counterclockwise and allow the device to work for 10 seconds. Using a tachometer, check the maximum speed. They should correspond to the number of turns stated in the passport to the chainsaw. If too lean the saw starts "screaming", and when adjusting at the excessively rich mixture can smoke muffler.
Optimal adjustment of the parameters of a chainsaw should be done by an expert with access to the tachometer.
Advice 2 : How to clean the carburetor of a chainsaw
The reasons of infringements in work of the engine of a chainsaw is often clogged the carb. This is due to the use of substandard petrol or ingress of foreign matter fuel tank. To clean the carburetorand it must be completely disassembled.
You will need
- - screwdriver with flat and Phillips blade;
- - wrench set;
- - cleaning compositions, lint-free cloth;
- - ultrasonic cavitation bath
Before proceeding, drain the fuel from the gas tank. Unscrew the mounting screws on the top cover of the chainsaw and remove it. Remove the air filter housing, the filter element and remove the housing by removing the nuts. Often, in addition to the screws, the casing is held with clamps. Otdelnie them by clicking the appropriate tabs. On the right side of the carband remove the fuel hose and pull the air damper. Unscrewing the mounting screws and nuts on the body of the carband remove it and remove the cable terminal from the lever throttle.
On the left side pull the fuel hose from its fitting. Remove the screw of adjustment of idling speed and the fixing screw top cover carb. Remove the top cover and find the fuel diaphragm fuel pump having a blue transparent strip. On the left side of the case you find the screws with spring clips. After removing the bracket, Unscrew the screws. Record label or remember their installation locations to avoid confusion during Assembly.
Unscrew the screws on the bottom cover of the carband remove this cover. Remove the node of the needle valve by removing the screw. Be careful – under duplechin lever valve actuator is installed spring. Unscrewing the screw of the air shutter, remove it. Then remove the axle of this valve, by applying force along it. Hole axis of the air vent cover in advance with your finger, in order not to lose the spring loaded ball in it.
Remove the throttle valve by loosening the screw of its fastening. Then remove the lever of an actuator and a spring washer-stopper. Please note: the screws securing the throttle interchangeable and the screw of fastening of the lever of an actuator is very similar but has a different length. Don't mix up the screws when assembling. In conclusion, remove the throttle shaft, noting its correct position.
Lay on the table all the details of the carband inspect them with the purpose of Troubleshooting. Worn parts and damaged gaskets replace the new. All parts are thoroughly rinse with the use of specialized detergents and dry with a lint-free cloth. The nozzles and tubes dry with compressed air. For easy purge use manual or foot-operated air pump.
With the purpose of increase of efficiency of cleaning of the parts in the carband use an ultrasonic bath, for cleaning using the cavitation effect. To do this, fill it with gasoline or diesel fuel, put in it all the necessary elements of the carband and turn for 2-3 period of 5 minutes each. At the end of the process blow the parts with compressed air.