Depending on how old and how much use it has had there are several things to try.
1 give it a tune up
2 adjust the throtle control
3 check and or replace the spark plug
Standard is full choke first, then half-choke for a couple of minutes, then run.
If it was made in the last five years or so, it should be 50 to 1. The above answer is incorrect for my Weedwacker. Craftsman Weedwacker 17"/25cc Gas Line Trimmer 2003 US EPA PH2 Family: 3PWES.0254TZ Disp: 25cc : EM Serial: [redacted] Model: 358.795543 Emission: durability period 50 hours Customer questions: 1-800-235-5878 IMPORTANT! Mix CRAFTSMAN 40:1 2-cycle engine oil with unleaded gasoline. Read oil container or operator's manual for proper mixing instructions. Other oils may cause engine damage. 1. Place stop switch in "ON" position. 2. Set unit on flat surface. 3. Slowly press the primer bulb 6 times. 4. Move choke lever to "FULL CHOKE" position. 5. Squeeze throttle trigger fully and hold [thru step 6] and pull starter handle sharply until engine attempts to run. NO MORE THAN 6 PULLS. 6. Move choke lever to "HALF CHOKE" position and pull starter handle until engine runs. 7. Allow engine to run for 10 seconds, then move choke lever to the "OFF CHOKE" position. TO STOP ENGINE MOVE STOP SWITCH TO "OFF" POSITION. The above three paragraphs are verbatim from three stickers on my Weedwacker. The stickers have no copyright on them. The simple answer to your question is, "40:1 2-cycle engine oil with unleaded gasoline." rcpao 2008-06-29 22:03
why is the pull string on the weedwacker locked up
MY lawn mower will start to sputter if I run the choke on after the motor is warmed up. It's getting fed too much fuel. Ease off on the choke and it will run better, usually.
Until the engine will run without the choke being pulled.
If it runs with the choke on, Then it will not do any good to adjust them. It is running lean/ not getting fuel. The carburetors have dirt in the fuel jets and that is why it won't run when choke is off. When choke is on that richins the fuel up and it try's to run. Need to clean the carbs out.
Off, it will not run properly with the choke on, the mixture will be too rich.
If you have to run it with the choke after it has warmed up, you need to disassemble the carb for cleaning.
No it will not. If you need increase the supply voltage and remove the choke.
It's bimetal so opens when warm releasing choke which richens mixture until warm enough to run without it.
Your Briggs and Stratton 5.5hp only runs with the choke on because it needs a tune up.
No. The choke reduces the amount of air being mixed in the carburetor. You will simply run very rich and run the risk of fouling spark plugs.