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You have two screws on the carb for adjusting. The one on top is for fast speed. Turn it all the way in and then screw out3/4 of a turn and try it. Turn it 1/4 more each time till it runs right. Other screw is for idle. It adjust the same way.
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The carburetor might be clogged. 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.
Restricted Fuel Lines
The engine can be suffocated from gasoline when at peak demand for fuel if there is any slight restriction or debris in the fuel lines. The fuel line may be clogged from stale fuel deposits, more reasons to cause your chainsaw to cut out when applying throttle.
There are many factors that can stop your chainsaw from running, including a bad spark plug or dirty air filter. There are simple problems: a broken fuel line, bad fuel, wrongly calibrated high-low adjustment screw. Also, more complex issues like a damaged carburettor or an engine compression problem.
A clogged air filter will starve the engine of oxygen, causing the engine to die at full throttle. A clogged air filter will often cause your engine to idle rough as well. As part of your normal maintenance routine, you should check the air filter for heavy build-up, and replace if necessary.
Over time, the spark arrestor can become clogged with soot. If the spark arrestor is clogged, the chainsaw may run stall or run rough. To unclog the spark arrestor, remove it and clean it with a wire brush. You can also replace the spark arrestor.
If your Stihl chainsaw starts up with a reassuring puttering sound, but dies when you pull the throttle trigger, there likely is an issue with the fuel, but the carburetor could need adjustment. If the saw stalls while it`s idling, it`s almost surely a misadjusted carburetor.
If your chainsaw still starts and then stops working, check the air filter. Clean or replace the air filter if it is dirty or damaged. Another reason that your chainsaw starts and then stops working could be that the spark arrestor is dirty or clogged. If this is the case, clean it with a wire brush.
How long the chainsaw runs before dying depends on how badly clogged the air filter is. In the case that your chainsaw runs for a while, then dies, it may be possible to simply clean the air filter to correct this symptom. However, a damaged air filter should be replaced.
There are three main reasons for a chain to come off: Incorrect bar and/or chain for the saw; check to be sure that you are using the proper chain pitch, gauge and number of drive links to match the guide bar. Chain not properly tensioned; It is normal for a new chain to stretch and require frequent adjustment.
Throttle which will stop the chain when pressure on the throttle is released. Throttle interlock which prevents the throttle from activating until the interlock is depressed.
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Will only start and run in choked position, when throttle applied chokes out. If started with out choke and throttle position in low speed will start and run for 10 sec then like it runs out of gas.
I have your solution guaranteed, I fixed mine yesturday remove H L screw plastic caps and on high 11 threads exposed and on the low side 8 threads exposed. removing the plastic caps allows u further adjusting these wear out or move soo just take them things off and you will be rolling
My Husqvarna 128cd weedeater would run with choke on but not in the run position. Sometimes it would run in the run position but would not stay running. I had it running and then it cut off. I now cannot get it to crank at all. Any ideas
More than likely a fueling issue, wrong fuel air mix or air leak somewhere
Seems to start easily run for a few minutes and then slow and stop–bulb remains full –gas is good–have tried half choke in case too lean–did not solve–also seems possibly related to the angle I hold it at–seems to cut out quicker if blower tube angled more downward.
Your filter may be hanging up in the tank. you also my be losing compression
Chainsaw runs fine than goes full throttle all by its self and cannot shut it off with switch.
Kill switch is broken or disconnected. Throttle linkage is broken or disconnected or idle is set way too high.
Riding lawnmower starts but will not continue stay running?
Its probably in your ingnition switch, grab the switch and turn it right the turn key I had the same problem and that fixed it. It also wasnt starting and it was the same problem the switch is lose.
Runs slow at full throttle runs slower than mid-throttle. Won’t deliver full power.
In California the new blowers have sealed mixture adjustments and you need the have your carb. mixture adjusted be a qualified shop. If your carb. HAS mixture adj., turn the high speed mixture so it runs best at high speed, then turn another 1/8 turn counter clockwise to be a little rich. Then at idle adj. the other screw till it idles best.
Have to run on half choke,just stops if i turn it off.fuel is 25 to 1. thanks alan.
More than likely a small passage way in the carb is clogged. You can try some carb cleaner, but you may need to disassemble the carb and clean it out. Be advised that these passageways are sometimes as fine as a human hair, and almost impossible to clear sometimes. A new carb may be required if it is worth it to you. Sorry.
My mantis will not stay running unless the choke is full on
Sounds like the fuel pump diaphram in the carb. you need to either be familar with it or take it to thae shop to replace