Carburetor settings on Mantis tiller

Start out with 1.5 turns on High speed jdet and 1/2 turn on the low speed. Make sure plug is not wet, better yet install a new one. Clean, fresh fuel and give it a pull.

Hi there is a small stone fuel filter in the tank. this filter stops fuel from running back into the tank from the carb check to insure it still on and make sure there are no cracks or hole in fuel line that should fix your problem

I don't know if you have a Zama or Walbro diaphragm carburetor on this unit, so I will give you tuning methods for both! Zama First....

http://www.zamacarb.com/tipspage.html and now Walbro.......

http://footflyer.com/fix/motor/carburetor/walbro.htm

After seating the screws back them out 1 1/2 turns. This should be close enough to get it started. Let the motor warm up a little then, with it idling, turn the low screw in until it starts having a hard time running then back it out until it idles smoothly. Prop up the Mantis so it can run at full speed safely while you adjust the high side. With the throttle wide open, again turn the high screw in until it starts running roughly and back it out until the motor is running smooth. Some say to turn the screws out until the motor starts having a hard time running and then turn it back in half way to where it was running bad at the other end. This doesn't work as some engines don't care how far open the screws are.

The high-speed carb jet may be fouled. Most 2-cycle carburetors have two adjustable jets, one for idle, another for higher speeds and loads.

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

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

Set low speed jet 1 turn out high speed 1 and a quarter turn out

Start at one and a half turns, and then listen to your engine as you adjust in or out on the screws. Should be two screws, High, and Low speed. With the engine warmed up, make slow adjustments in, and out until the engine runs free, and easy, not sounding like it is bogging down.
Hope this helps.

Try by tightening both setting screws (not too tight as this will damage them) ...just enough to the home position...then backing off 1-1/2 turns on each. Try to start, if does not start, then then back off another 1/4 turn, continue till you can start then once started regulate adjust screws slowly to find a smooth idle.