Question about Troy Bilt Tb70ss Gas Trimmer

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My trimmer will start but will not stay running? Fuel mix is correct, I can adjust the throttle screw to keep it running but it still stalls out after it gets running. what else can I do to repair this problem.

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You may have a fouled carburator. Also, check the spark plug for signs of fouling (Black and oily). The plug should look grey and have a somewhat dry appearance. Try using a carburator cleaner first, and if that doesn;t do it you'll need to overhaul the carburator itself.

Posted on Jul 11, 2010

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Ryobi s430 will idle but will stall out when throttle opens. This carburetor has one idle adjustment screw and one fuel mixture screw.


Those carbs are a pain. Try arousing the idle screw, turun it to the right, then try to see if it will idle. You will have to tinker with the adjustment screw and the idle screw. Eventually you're gonna need a new carburetor. You can rebuild it, BUT , chances are those cheap carburetors never are the same.

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Trimmer will only run for a few secs then dies out


First, use the same oil and mix it the same from batch to batch, once you have made a batch (gallon or what ever, never add gas or oil to make more, use up the batch to the last drop, then make a new gallon). Be sure the air filter is clean, some are weted with oil to catch more dirt and provide a bit of extra suction, clean and spray it with a spray cookingoil or soak it in oil fuel mix. Next: Look for 3 adjustment screws on the carb. should be three total. 1 screw is for idle adjustment. the other 2 should be close to each other, one is low speed fuel/air mix and the other is high fuel/air mix. Adjust the low fuel/air mix screw until it will idle un-added with the throttle then adjust the idle on the throttle to get a good idle speed. Next adjust the High fuel/air mix until it gets the RPM's you want it to have. It should go from idle to high speed with out hesitation or cough. It should also run with power to cut any weeds or limbs with out bogging out.

on May 30, 2010 | Garden

1 Answer

How do you adjust a Stihl weedeater carburetor?


Oiless fuel ruins your compression. The trimmer should crank anywhere above 50 psi. A good place to start with the jets is 3/4 to 1 out. You may have damaged the new jets by srewing them all the way in. These small jets are often needle thin and can be damaged when bottomed out.

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2 Answers

Why won't my FeatherLite FL-20C weed eater will not stay running when I put it in full choke. What could be wrong?


It should run ok after warming up. After starting it, let it run for a minute or so and then try gradually opening the choke. You might try increasing the throttle setting at the same time. After the motor is hot, if you have to have the throttle setting increased in order to keep it running it means the idle setting needs to be increased, usually by turning a screw to keep the fuel valve from closing so much, or that there is a problem with the fuel flow......like a clogged jet or fuel passage in the carb.

Jul 07, 2014 | Weed Eater Featherlite Fl20 Lawn Edgers

1 Answer

Why wont my trimmer take gas after it starts ?


Open, turn ccw, the high 'H' speed jet screw about .3 of a turn while holding the throttle wide open at the trigger. Engine should increase spread andyou may have to adjust. Failing that and assuming correct oil/gas mix it will likely be carburetion, clogged fuel filter or bad fuel line.

May 02, 2014 | Husqvarna 128LD 17" Gas Trimmer

1 Answer

Homelite ST-155 trimmer; fuel air mix out of adjustment (operator error!). Will not start. Cleaned fuel filter, cap filter, added new fuel w/proper mix. Need basic fuel air adjustment to get it started.


do you have adjuster screw's on the carb???

if you do then screw them all the way in then back them out about 1 and half turn then slowly adjust until correct setting's are reached

Aug 18, 2010 | Homelite Garden

1 Answer

2 cycle engine speeds up then stalls


1 turn out is approximate setting fo H and L screws...once running adjust H screw so that it is just rich at full throttle (4 stroking then 2 stroking with out changing screw) once thats right adjust L screw at idle till it starts to pick up speed then just back off 1/8 of turn ....then you can adjust tapered screw to nice idle....if this fails you have carby problem

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3 Answers

Trimmer will only run for a few secs then dies out


Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it
run a few times like that and it will flush the gunk out of the jets,
but most of the time you will need to rebuild the carburetor.
If the mower is over a couple years old, then I also recommend that you
buy and install a new carburetor repair kit, because the diaphragm will
get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, count the
number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns
they were in/out.
Please do not forget to rate me, Thanks
Good Luck, I hope this helped

May 17, 2010 | Craftsman Convertible 25cc. Gas Line...

1 Answer

I have a poulan pro trimmer, it wont stay running


First of all, YES. boggs is a word in my dictionary. Remove the muffler and carefully take it apart. Pay close attention as to how it comes apart because it is vary important it goes back the same way. you will probable find that it is clogged. If it is then remove the debree. If it isn't then you will have to adjust the fuel mixture screw. First start the trimmer, then let it run for a few minutes to warm up, then gently turn the screw a little bit at a time counter clockwise first, squeezing the throttle inbetween adjustments . If it starts to take off then fine tune it untile your happy. If it boggs worse then turn it clockwise.

But first check the muffler.

Good luck

Aug 05, 2009 | Poulan 25cc 2-Cycle Gas Powered String...

1 Answer

I have a Ryobi trimmer and when I start it will not stay on


Here was my solution:
I was having problems with my ryobi cs30 weedeater also. It would start up fine on full choke, but i could not give it more than half throttle or ever take the choke off or it would stall out. I replaced fuel mixture, spark plug, spark arrestor/exhaust, fuel lines, cleaned carb, and still nothing! I was considering getting a better machine. Then i decided to play with the carb adjustments.(on my cs-30, they are two screws on the carb that have a "L" and "H" next to them) I dont think you can get the specialty tool for adjusting the carb unless you are a repair tech, so i just took a Dremmel tool with the circular cut-off wheel to the head of the specialty screws and made them into "flat-head" screws so i could adjust them with a regular screwdriver (if you dont have a dremmel too, get one!) (As i was cutting into the head of the screws, i also cut into the casing protecting the head of the screws that was in the way, this does not cause any damage to the unit, that casing is only there to keep "un-certified" people from adjusting it for themselves.)
Now to the easy part: The "L" screw adjusts the idle fuel mixture and the "H" screw adjusts the full throttle fuel mixture. turning the screws clockwise make the machine run leaner (less fuel) and counter clockwise makes it run richer (more fuel).
-I started out by turning each screw 1/2 turn counter clockwise and started it up, then as it was idling, i started adjusting the "L" screw as i was moving the choke position to run, after a few full turns counter clockwise of the "L" screw, it was idling perfectly in the run position, then i did the same thing the the "H" screw while holding down the throttle and i got it to run perfectly in the run position. Now it is running way better than it ever has. I hope this helps everyone.
Good Luck!

Mar 27, 2009 | Ryobi 30 Cubic Centimeter Curved Shaft Gas...

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