Question about Mantis Garden

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Tiller wont start, I changed the gas in the tank with new gas that I mixed the little bottle of 2cycle oil as required, changed spark plug, . I called the factory or manufacturer last week, they said pull the wire loosefrom engine that goes to off and on switch, the ground wire is a thin wire, disconnect that and try to start, if it starts then the switch is not working. the connectors I have are a small cannon plug device no smal wire is evident unless I peel the coating back, I am not going to do that, this till er was purchased in 2004, I had in the plant for overhaul in 2008 , when I got it back it ran very good but up till last time in early spring it didnt run so good like it would almost bog down then run at high speed after a lengthy warmup, but now it wont even sputter when trying to get started,,,,,,,,,,,,Dennis in Arizona

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  • guifiddle Aug 31, 2010

    Dear Sir, I had a troy bilt for twenty years till I moved. where I moved to had a small area for a garden that is why I have this Mantis I sold the troybilt because it was too big for the job needed, thankyou Dnnis in Az

  • guifiddle Aug 31, 2010

    A troy built or large tiller is too big for the garden I have or its use, that is why I have mantis but unfortunately it doesnt always work. there arent any garden centers here or places to purchase the small carburetor you mentioned, and besides if there were I dont have the tools to perform this function

  • guifiddle Aug 31, 2010

    there are several small repair sights here but the last time i had a repair done on this tiller it worked one time and then quit working (No guarentee) from the repair sight

  • guifiddle Aug 31, 2010

    Helllo: I dont have a meter nor do I know how to read it, this tiller is a Mantis tiller I think it is the same engine as a Wankel type , no piston just what a wankel performs, no fuel pump or carburetor, the electrical system I think is a Magneto device, no way to check it

  • guifiddle Sep 01, 2010

    The filter has been changed, and this engine doesnt have a fuel bowl, or a carburetor that is noticeable, this is a rotary engine is a two cycle device runs on oil and gas mixture

  • guifiddle Sep 01, 2010

    Mabey I didnt enter what type tiller it is, it is a Mantis a 2 cycle engine, the engine doesnt hve a piston but I think it is a rotary engine, has very small parts and I think the electrical system is a magnito , cant be sure

  • guifiddle Sep 01, 2010

    this engine doesnt have an oil switch to cut off if you dont change it. the only oil is in mixed with the fuel

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8 Answers

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Looks like the carburettor is not taking the right amount of air / gas mix.

Have you tried to set the screws on the carburettor to tune the air mix?
The other part could be the high tension cable feeding the spark. Have you tried to test if the spark is generated by the spark plug?

Posted on Sep 01, 2010

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Have you cleaned the air filter? If not, do so! Also remove the spark wire & clean the connection tip to the spark as well as the spark plug tip. They sometimes get an oxide &/or rust causing a poor connection. Make sure there is no water or dirt in the float bowl of the carb. Good luck! Hope this helps you.

Posted on Aug 31, 2010

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I agree that spark plugs replaced.But did you checked with meter for voltage at spark plugs.Also do the spark plugs getting any power.Check it with meter and confirm. The other thing to check is the fuel pump is the fuel passing from the pump and reaching the engine.Get it checked . Keep updated.Thanks.

Posted on Aug 31, 2010

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Sounds like a fuel delivery or carb problem.... but you MUST be sure the switch is operating properly.

If you're not willing to do it - take it to a professional.

THanks!!

Posted on Aug 31, 2010

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Possible that there is an oil switch that cut off if the oil was not changed on time( as it gets thicker and pressure drops) This pressure switch will cut off spark and the engine will not start. So check this out.
If not try to see the spark after removing the plugs and cranking.If there is no spark you will need to start from the source, check the coil voltage if the momentary impulse comes for switching if not check the contacts/capacitor.
Once the plugs are sparking , pump up the engine to dispel all the excess fuel in the cylinder, wait for some time before the plug is put inot. Now heat up the plug in your gas burner a bit to clean all smears and set in with the heat.
Now crank and see if this starts.

Posted on Aug 31, 2010

  • Donald DCruz
    Donald DCruz Sep 01, 2010

    Whatever be the power , check the magneto to deliver the spark for the plug. Though this is a rotary engine the compression and the firing should be intact. The suction cycle must draw forward the fuel intake. So if you have cranked always make sure the excess over flow is out of the engine. Also heat up the spark plug and put in the crank. hope this works.

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There's a lot of comments about this problem on this web blog:
http://forums2.gardenweb.com/forums/load/tools/msg0514221722676.html
I'm inclined to think you should try some carb cleaner first, just for kicks. Also, the diaphragms might be bad, and a carb rebuild might be in order.
Good luck, hope this helps, and thanks for using FixYa.

Posted on Aug 31, 2010

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Hi Dennis. Take your tiller into a local small engine repair shop. Other wise you are going to be getting trial and error suggestions and spending money unnecessarily. J.

Posted on Aug 31, 2010

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Most garden equipment has problems such as yours for they are not used every weekend, and put away for the winter. The most common problem is when stored away and the particles that collect in the fuel tank break loose when sitting for months. Then when you bring it out and try to start it these particles flow through into the jet tube and clog up one or two drilled out holes starving the engine for gas. I see you have a two cycle engine. That is not good for a tiller. get it fixed and buy one with a 4 cycle engine instead. It does the job 4 times as fast and gives less trouble too for years. Mine is ten years oud and never had it apart yet. Of course its a Troy Built

Posted on Aug 30, 2010

  • frank thomas wilson
    frank thomas wilson Aug 31, 2010

    The tiny carburetor can be purchased separately at most garden centers. These are not advise by most experts to rebuild. By the way 2 cycle engines are not worth having on any garden equipment for the just do not last. A 4 cycle engine can be had on a small triller and they drive themselves as well where as a 2 cycle engine you have to push it along. If yours had a drive option that wears the engine down the first few hours of work on them if its a chain drive system

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1 Answer

Do i mix the gas with 2 cycle oil


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