Question about Hedge Trimmers

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Toro line trimmer model TB90BC

Ok now when I first start the trimmer cold I put it on full choke of course then when I hear it pop or act like it wants to start then I put it on half choke and so on. It will start sometimes but when it does start it will run only for like maybe 5 seconds then cuts right off everytime it starts. I just got finished taking the carburetor apart then soaking it the carburetor cleaner yea know the little paint looking can with the basket in it by gunk. And it still is doing the same thing. I am thinking vapor lock but I tried to start it with the cap of o yea and I tried starting it with the muffler off also and still the same symptoms please help thank you.

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  • Missourian May 08, 2009

    This is sthe third line trimmer from toro that I have had this problem with. I only get one season out of the trimmer. Where I purchased the trimmer from has replaced it twice. There was no old gas in the tank, I used new gas. The trimmer would start, but when I tried to accellerate the throtle, it would die.

  • Anonymous May 20, 2009

    I have a Troy BC90BC and it has the same problem. Its about three years old and I have done everything under the sun to solve this problem of not want to run at full speed. It will only run with the choke handle in the middle and stalls if you give it any gas. Does anyone know of a brand of string trimmers that doesn't preform like this.

  • Antonio Boscia
    Antonio Boscia May 11, 2010

    does it only start with the choke on? does it only start if you primer it first?

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First you may want to check your fuel that is in the tank, how old is the fuel and was there any old fuel in the tank before you put fresh fuel in? Todays gas isn't as good as it used to be the ethonol in fuel is eating pretty much anything that is made of rubber in our 2 & 4 cycle engines cleaning doesn't always help. You may want to try a rebuild kit for it. And re-adjust the high and low idle needles (jets).

Posted on Jan 08, 2009

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Mitox 28lhr long hedge trimmer does not start properly. It takes at least 50 pulls of the start cord before it starts. I've changed the spark plug but to no avail. Any advice on how to help it start


  1. Switch machine to On position.
  2. Switch choke to full.
  3. Pump the primer bulb 5 or 6 times to prime the carb.
  4. Lock the throttle on with the throttle switch.
  5. Pull over until engine fires. (it may only be a quick pop)
  6. Switch to half choke.
  7. Pull over until engine starts and runs.

    Also check the air filter is clean and the fuel filter is good.

    I've added a link to the manual incase you didn't have it. Page 30.

    http://www.mowerspareparts.co.uk/v/Mitox%20manuals/271MT281MT.pdf

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Primer bulb will not prime


Hello Tony Galvan, I had to replace the fuel lines to keep from sucking air when I pressed on the primer bulb. Also, I took the carburetor apart and found the gasket was good by holding it up to the sunlight, no light came through indicating holes in the gasket. Then I took a magnifying glass and looked at the bottom half of the carburetor and noticed that a soft film of what looks like lint from a dryer had accumulated on a screen mesh type of filter. Once I cleaned the debris away, the weed wacker started every time. I pulled with a full choke and partially wants to start. Then moved the choke to half choke and pressed on the throttle fully and pulled, it started! But you must at least hold the throttle close to full until 10 seconds for the engine to warm up. Then move the choke to idle. Hope this helps.
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I can assure you it wont be leaking oil, as the only oil it uses is mixed with the fuel.

Lock throttle trigger on,
Start on full choke till it fires,
Switch to half choke and it should fire up on high revs,
Blip the throttle and it should turn to tick over.

If it still keeps cutting out it could point to a carb or fuel takn issue.

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full choke on , push petrol bubble 5 times then pull starter cord., with luck it will kick in to life after a 20/30 secs put on half choke , run again for 30 secs the no ckoke.

The main problem with Ryobi products is that they flood very very easly. So the more time you try and pump petrol into the carb the more it will flood . If that happenes then choke off and switch off and then just pull starter cord for about 30 secs then switch on and it could start if not prime it again as above good luck

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Ticks over ok but when i squeeze the trigger it dies down and then stops


  • Alow the engine to run for longer on the start setting before you switch to run (choke turned off)
  • Ensure air filter is clean. Foam elements can be washed with hot water and detergent and then rub about half a teaspoon of oil evenly through the foam. Paper elements can be cleaned with compressed air blown from the inside of the filter but ideally should be replaced.
  • Check fuel lines aren't kinked or blocked restricting fuel flow.
  • Ensure fuel filter isn't dirty. This is probably located at the end of the fuel line in the tank.
  • The fuel lines may have become airlocked.This can happen if the tank is run dry. If the trimmer has a primer bulb, alternatively press it several times and then try to pull start the engine with choke on. Repeat this several times. The primer bulb should feel spongy and fill with fuel.Once the engine kicks, switch to run
  • Ensure the choke is turning off ok when you rev the machine (automatic turn off choke)

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Yes, the throttle should be in the full in position. When starting, the choke should also be in the full on position.
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