I installed a new spark plug and air filter- no difference. I installed a new carburetor, fuel line and filter – no difference. It starts and runs great, except for its failure to rev up enough to do some work.
Clean the internal parts of your carburetor now with…. A carb kit can be purchased to help clean and rebuild a plugged carburetor. Clean the internal parts of your carburetor now with carb cleaner, using a soft brush to get inside all the holes. If you notice damage or corrosion, it’s time to abandon the maintenance and simply purchase a new carburetor, as this one is beyond repair.
The saw will start fine, but when you give it throttle it’ll groan at you without reaching proper chain speed. It is a very common thing when a saw is first started, and can oftentimes be overcome by goosing the throttle a couple times, but some saws will continue to do it indefinitely. If your saw does not have a metal clamp on the boot between the carb and cylinder that’s likely your problem, they leak air and don’t feed impulse to the carb sometimes causing your symptoms.
Firstly turn the L screw until the engine ticks over comfortably without the chain turning. To adjust the H screw the machine needs to be run on full throttle whilst adjusting the screw. The screw should be turned anticlockwise until the machine struggles to rev to max rpm, then turned slowly clockwise until the engine picks back up to max RPM.This should then be set to go.
chainsaw does not rev up Related Question:
What causes a chainsaw to not rev up?
If the filter becomes clogged, not enough fuel will reach the engine for it to run properly. 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.
Why does my chainsaw stall when I give it gas?
Carburetor Adjustment An engine stalls when it’s getting too much or not enough fuel from the carburetor. Stihl chainsaw carburetors usually have three adjustment screws: one each for idle, low speed and high speed. If the saw stalls while it’s idling, adjusting the idle screw, which usually is marked LA, should help.
What causes a chainsaw to bog down when accelerating?
The reason for that may be you’re using the saw at altitude or the carburetor adjustment has simply slipped. The saw also won’t operate well at speed if the air filter or spark arrestor or carburetor are dirty.
What 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 chainsaw only run with the choke on?
When your chainsaw only runs if the choke is on the problem, in most cases, is a result of fuel supply problems or a faulty carburetor. To fix the problem you should check and clean the fuel system and carburator.
Why does my chainsaw rev too high?
The throttle valve (butterfly) simply cuts off the supply of combustible air/fuel and the engine stops. If this adjustment is set too high, the high idle speed will cause the centrifugal clutch to engage and the chain will run. This is a dangerous condition and should never be allowed.
Can you run a chainsaw without a spark arrestor?
We can’t run without arrestors here, and the fire danger is so high I wouldn’t anyway. There is less restriction without it, but cleaning them from time to time helps a lot. If it’s hot and dry, I wouldn’t risk it.
Why does my chainsaw start but wont stay running?
The most common problems why a chainsaw does not stay running are: Spark Switch/Plugs. Bad Fuel. Blocked Carburetor.
Is it OK to remove spark arrestor?
You can safely remove the spark arrestor or even install an aftermarket exhaust system on many ATVs without having to make alterations to your jetting because they are normally set up to run a bit rich from the factory, but this is no general rule!
How do you start a stubborn chainsaw?
Try to start the chainsaw after priming the carburetor. 5. Activate the choke by moving the lever to the full choke position and pull the starter rope 3 or 4 times to start the engine. If that doesn’t work, move the choke lever to half choke and pull the starter rope, 6 times maximum, to start the engine.
How do you clean the carburetor on a chainsaw?
Let the chainsaw run at low RPMs/idle for a while. This is to let the cleaner run through the carburetor, the fuel lines, and the idle engine. The cleaner will wipe remove the gummy residue blocking the components to create a clean passageway for the air and fuel. As the RPMs begin to increase, turn down the idle knob.
Will a chainsaw run without a fuel filter?
While it’s possible to run your chainsaw without a fuel filter, but this is not recommended. When a fuel filter is clogged, it can cause considerable damage to the engine and leave your chainsaw unusable.
How do you adjust the H and L on a Stihl chainsaw?
Determine the carburetor type before adjusting the high- and low-speed screws. To do this, turn the “L” screw clockwise as far as it will go, using a flat-head screwdriver, then turn it counterclockwise as far as it will go.