With the engine running turn the high speed needle clockwise until the engine runs rough. Turn the needle counter clockwise slowly until the engine runs smooth. Make this adjustment with both screws and the engine should run smoothly and at the highest fuel efficiency.
How do you adjust the carburetor on a Craftsman 42cc chainsaw?
With the engine running turn the high speed needle clockwise until the engine runs rough. Turn the needle counter clockwise slowly until the engine runs smooth. Make this adjustment with both screws and the engine should run smoothly and at the highest fuel efficiency.
Why does my Craftsman chainsaw bog down?
Many chainsaw operators first notice a problem with chainsaws bogging down when they’re using the chainsaw under load, and this is usually the result of poor air circulation. This issue is caused by a clogged air filter on the chainsaw. … Wash the air filter in soapy water until the air filter comes completely clean.
How do you adjust a craftsman carburetor?
- Locate the carburetor on your Craftsman equipment. …
- Turn the main mixture and idle mixture screws on the carburetor counterclockwise about one full turn with a flat-head screwdriver. …
- Start the engine with the transmission in neutral and let it run for several minutes.
Why does my chainsaw dies when I give it gas?
Because your chainsaw will idle, but dies when it is revved up to full power, it means that the filter is only partially clogged; it will allow enough fuel to the engine to run on idle, but not enough to sustain full throttle. … If the filter becomes clogged, not enough fuel will reach the engine for it to run properly.
Why does my chainsaw only run with the choke on?
If your chainsaw only runs with the choke on, it is likely an issue with your carburetor. … If the carburetor is plugged, the engine will be starved of fuel and will not run. However, if the engine is plugged, the choke will pull more fuel through the carburetor’s idle circuit and allow it to run.
What is the H and L on a carburetor?
They are typically labeled L (low speed jet), H (high speed jet), and I (idler jet).
Where is the idle screw on a Craftsman chainsaw?
Locating the Idle Screw They are located on the side of the engine housing, just behind the air filter. The idle screw is the uppermost screw, and of the two lower screws, the low-speed screw is the one on the right.What is the T screw on a chainsaw?
The T screw regulates how much fuel is sent to the carburettor while idling until the throttle is pressed. L Screw – With the chainsaw still running, take a screwdriver and turn the L screw clockwise. Keep turning it until the engine almost stops turning.
Why does my chainsaw start and then stop?A clogged carburetor is often caused by leaving fuel in the chainsaw for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the chainsaw engine to stall.
Article first time published onWhat does a spark arrestor do on a chainsaw?
The spark arrestor on your chainsaw prevents dangerous hot sparks from igniting fires while you’re working. If the arrestor is clogged or dirty, however, it will also prevent exhaust from leaving the motor, which can prevent it from running.
Why does my Poulan chainsaw dies when I give it gas?
A clogged fuel filter is often caused by leaving old fuel in the chainsaw. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the fuel filter and cause the engine to stall.
Why does my chainsaw idle fast?
The most probable – and easiest to fix – cause of chain rotation while the chainsaw engine idles is a poorly adjusted idle setting on the carburetor. The result is that too much fuel is delivered to the combustion chamber when the throttle is released, and the engine doesn’t really slow.
How do I set my carburetor to use less fuel?
Once the engine has arrived at operating temperature, go back to the carburetor and adjust the air fuel mixture screw, or screws. Tightening the screw increases the amount of fuel, while loosening decreases the amount of fuel.
Why is my carburetor popping?
Fuel To Air Mixture Is Too Lean Too much air and not enough fuel causes backfires to occur in the intake manifold. The exploding mixture then vents through the carburetor. Improper carburetor adjustments or vacuum leaks can cause this condition.
How do you tune up a chainsaw?
- Remove the chain brake cover.
- Remove the chain and bar.
- Wipe down the whole chainsaw.
- Remove the top cover.
- Replace the spark plug.
- Replace air filter.
- Replace fuel filter.
- Sharpen the chain.
How do you idle a chainsaw?
First set the idle speed by setting it as high as possible without engaging the clutch (close to 2700 RPM if you have a tachometer). Then set the low-speed screw by turning it gently in until the engine begins to starve for fuel, then turn it out gently until the engine loads up.
How tight should a chainsaw chain be?
A properly-tensioned chainsaw chain should still be just a little loose on the chainsaw guide bar, but the chain needs to be tight enough that you can’t pull the drive links out of the bar nose.
Why is it so hard to start my chainsaw?
Old fuel collects moisture, making the fuel difficult to ignite. … It’s possible the engine is flooded with fuel. To clear excess fuel from the carburetor, place the choke lever in the Off position, hold the throttle trigger fully open and pull the starter rope 5 or 6 times. Try to start the chainsaw.
Is the choke supposed to be open or closed?
The choke is only used when starting a cold engine. When doing a cold start, the choke should be closed to limit the amount of air going in. Once the car has warmed up, if the choke does not open fully, the restriction in air may result in reduced power.
Why does my small engine only run on full choke?
An engine that requires the choking ( partial or full ) after initial engine warm up is an indication that the engine fuel air mixture system is out of adjustment. … Both the manual choke system and the manual primer system engines may experience this similar symptom of running only when the fuel mixture is enriched.
Why won't my chainsaw start when it's hot?
When your chainsaw quits after it gets hot, you either have a problem with gas flow being restricted into the engine or with the spark. This is a common occurrence on older-model chainsaws. By replacing your spark plugs and keeping your gas lines clear you can reduce the chances of this problem recurring.
How do I know if my chainsaw spark plug is bad?
- Black, chunky carbon buildup spanning the gap between the sparking end of the plug and the hook-shaped metal piece overhanging the end.
- Dark carbon residue built up on the ends but not spanning the gap.
How do you start a chainsaw after sitting?
- Just let the saw sit for 30 min and the excess gas will evaporate.
- Remove the spark plug, dry it, crank over the engine a few times to dry the cylinder. Now refit the plug and try again.
- Set the switch to “On”, set throttle to fully open, set choke to “Off” and crank over the engine.
