Last year I paid a small engine mechanic $65 to rebuild the carburetor on my then 7 year old Mantis Tiller/Cultivator when I couldn’t get it to start. This Spring I couldn’t get the tiller to start for some time. Then it would run rough for 10 minutes or so and cut out again. Frustrating!! I read up on it, and made some easy adjustments and in about 5 minutes had the tiller working perfectly! See what I did. I hope if you are having problems with your tiller, you can get it fixed. Maybe this will work for you.