So I got the new 4-stroke Mantis as a gift and was very stoked to use it this season. I got it all set up and assembled, filled the oil with the oil that came with it and topped of the gas. I have about a 800 square foot garden so I was looking forward to not having to do all of my tilling with a rental this year. I took it out to do a pre-till prior to adding my topsoil and manure and about 10 min into my first row the thing stalled out. I started it again and then it stalled as soon as I hit the throttle. It idled just fine. I took it out of the garden and tested it again and same result. So I got on the phone with Mantis and they suggested I needed to adjust the idler screw next to choke lever. I did that today and tested it again. It seemed to do the trick, but then half way through my first row I started stalling again. I had already gone through everything in the manual and made sure everything was set up correctly.
At this point I was frustrated and ready to send it back so I dumped all the gas out of the tiller and started it to idle out the rest of the gas but figured what the heck let's just throttle it out and low and behold it ran like a champ until the last of the gas was gone. So I decided that maybe my problem was I was overfilling the gas tank.....didn't think that mattered but apparently it does. I filled the gas tank half full just over the ports for the pump and return lines and finished tilling my entire garden without a single stall.
So for those of you who have had stalling issues I suggest you try this. I am posting this also to give Mantis a chance to clarify as I could find nothing in the manual (haven't reviewed it again yet since my new finding) and see if this is normal or if something is causing me issues when I top of the gas.