Sounds like the throttle cable is sticking or the carburetor butterfly is sticking.
Squirt some WD-40 into the cable that attaches to the throttle handle and onto the mechanism the cable hooks to at the carburetor. Carefully actuate the throttle and see if the mechanism is moving smoothly. It may need several squirts and some actuation before it become free.
Find the cable that goes from the throttle lever and detach it from the carburetor, if it goes back to idle then the problem is in the throttle lever assembly, if it will not go back to idle then the problem is in the carburetor/ throttle connection.
With no more information provided, I would make sure that the throttle cable was not stuck thus preventing the throttle from returning to its idle position. Try manually moving the throttle closed at the carburetor. Possibly spray some WD-40 on the throttle cable ends to help loosen it up then reply with your results.
SOURCE: the tines on my mantis tiller quit turning,
Here is the parts breakdown for what could be the problem. You should be able to fix it yourself.
http://www.alamia.us/Mantis_Tiller_Parts_s/149.htm
Here is a helpful video for continued self-service:
http://www.alamia.us/mantis_parts_s/148.htm
SOURCE: Engine runs fine on 2-cycle Mantis tiller, but
Your problem is a common one on Mantis tillers. The engine sounds like it is not breathing properly. I have fixed dozens of these problems and it is almost always the spark arrestor clogged up. The spark arrestor is found inside a small housing on the muffler (easy to fix). There are 3 screws that need to be removed to get the muffler cover off, then you will see a small housing a little over an inch long with another 3 screws...remove them and you will see a small screen that is probably clogged. Clean it and the housing with a solvent (I usually use carb cleaner) then re-install the arrestor and reassemble the muffler cover. This will fix your problem about 80% of the time.
If that is not the problem you may need to fix the carburetor (take my advice and just buy a new one...not much more expensive than the repair kit and a lot simpler.
SOURCE: tiller engine runs but the tines will not turn
You should look at gear box oil and see if there is metal in the oil.If there is you will need to check the gears for excess wear.Also make sure rpms are in the operating range.Let me know what you find.
SOURCE: MY TILLER HAS FULL POWER,
Watch this video.
http://www.alamia.us/mantis_parts_s/148.htm
If everything is fine then replace parts necessary - parts breakdown:
http://www.alamia.us/Mantis_Tiller_Parts_s/149.htm
SOURCE: are the tiller tines supposed to turn while the tiller is not on
no the worm gear is not designed to
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