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Tiller runs but has no power when tilling . Tried changing the idle setting but did'nt help

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Mantis tiller Idles fine, and can even rev... sometimes, but has no power.


check the diaphragm in the carburetor making sure it isn't stiff. depending on how long it has sat, the carburetor may need a cleaning and kit then readjust it to get it to run. Mantis tillers are very temperamental and can be difficult to get to run again even for experienced technicians

Feb 25, 2013 | Mantis 2-Cycle Tiller

1 Answer

Lev90 120 carb


Hi Charles Gregory
Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
Please take time to rate me
Bud

Oct 01, 2012 | Garden

1 Answer

Gas leaks, only when tilling, not when idling.


check the float level it might be set to high

May 17, 2012 | Garden

1 Answer

Just bought an older Mantis 2 cycle tiller. The tines engage when the tiller is started. Of course that makes it hard to start with the tines on the ground! I don't believe it was doing this when I...


if the idle is too high the tines wont stop due to the tiller tines are run by a "centrifuigual clutch" which means when you increase the throttle speed the tines will start to turn : there are 2 adjustments you can try,1) adjust the idle screw under the carburetor where the throttle adjustment and a triangle piece of metal touch(your throttle cable wire will be attached to this triangle) ,if the triangle and idle adjustment don't touch and there's a gap between these 2 pieces close the gap by adjusting the 10mm adjusting nut,this will correctly set the idle #2) adjust the idle adjustment screw talked about above till the tines dont turn with throttle set at idle or lowest speed setting

Mar 26, 2011 | Mantis 2-Cycle Tiller

1 Answer

My Mantis tiller is 9 or 10 years old. I've recently had the carburetor replaced but this year the tiller won't idle. The tines want to turn and you have to hold in the air to start it and move it to the...


Hello,
My name is Dane and I am going to assist you in solving your problem.

You should have an idle screw adjustment on the carb to adjust the idle RPM. As you pull the trigger, watch on the carburetor for a small moving plate. The idle screw should touch that plate. Be very careful, and have someone hold the tiller and start it. Back off the screw just enough until the tines stop turning. I hope I've helped. If you found this reply useful, please leave me some THUMBS UP, if you feel I've deserved them. Thank you! Dane

Dec 06, 2010 | Mantis 2-Cycle Tiller

1 Answer

Mantis tiller rpms shoot way high with slight increase in throttl


It is leaking air into the intake somewhere or
the rings are shot
the crank seal is shot
the crankcase gasket leaks.

Jun 08, 2010 | Mantis 2-Cycle Tiller

2 Answers

MANTIS WILL NOT IDLE


What kind of engine is it ? Does it have a float carburetor or diapram carburetor ?

May 09, 2009 | Mantis 2-Cycle Tiller

3 Answers

Difficulty adjusting carb for smooth idle and full power tilling


Your quickest fix for this problem is to simply replace the carburetor, a Zama K54A. Do it all the time. After that, if you can find a 2 cycle oil, Opti-2, it's the best you can use and it's a one mix for all your 2 cycle equipment (blowers, trimmers, chainsaws, etc.) It's the only 2 cycle I sell in my shop.

Apr 05, 2009 | Mantis 2-Cycle Tiller

1 Answer

Tiller won't start.


I recently had the same issue with a tiller that hadn't been started in over 8 years. Turns out that old gas had left a varnish coating in the carburator keeping the gas from feeding. Rebuilt the carburator with new float, needle valves and bowl, new Welsh plug. Fresh gas and two pulls later it went to churning. Took a short time to adjust the two needle valves for idle and full throttle and we went a-tilling.

Apr 04, 2009 | Troy Bilt, Tuffy, Rear - Tine Tiller, 4.0...

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