Question about Yard Machines 121R 31cc 2-Cycle Gas Powered Cultivator/Tiller

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Yard machine 31cc tiller dies when moved from choke

Posted by Anonymous on

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: fuel line routing yard machine 31cc cultivator

unit with primer bulb,,,,,line from gas tank with filter, goes to bottom of carb, from top of tank to suction side of primer bulb, from output of primer to tank return

Posted on Apr 29, 2010

Testimonial: "Thanks for the info, tiller runs fine. Phil"

#1 Taper
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SOURCE: ifound a Tecumseh Yard Machine Front Tine Tiller.

It sounds as if you still have Carburetor problems.

Use a Den Tek Brush, (, to clean the small portals in carb. These portals can become blocked.
(If there is a small screen in the Carb., this can get blocked too. Make sure that it is clean as well.)

Reassemble and start. (If there is a small screen in the Carb., this can get blocked too. Make sure that it is clean as well.)

If the carb. parts are more than 4 years old, you may have to replace them.

If you need further assistance on:
1. Fuel line replacement or
2. Carburetor kit replacement

Just let me know.


Posted on Sep 09, 2010

  • 183 Answers

SOURCE: 31cc yard machine garden cultivator.

Only 3 possibilities for no spark. First, are you using an inline spark tester to determine there is no spark? If so, here's your possibilities.
1. The on/off switch is shorted out.
2. There is a short in the wire(s) from the switch to the ignition module.
3. The module is faulty.
Dissassemble the engine cover far enough to access the module. There is a small wire that leads to a spade connector on the module. Disconnect this wire. Retest for spark. If you still have no spark, the module is faulty and must be replaced. If you now have spark, then the module is good, so back track the wires to the switch to determine if the wires are pinch or chaffed, or if the switch is stuck in the off position.

If you are not testing for spark with an inline tester, please, please go to Walmart or Pepboys or Autozone or NAPA or Sears and spend $7 to $10 on the will save you alot of trouble.

Good luck.

Posted on Sep 13, 2010

  • 1545 Answers

SOURCE: I need a diagram for

Here is a parts breakdown for your machine (found under MTD) with parts listings, diagrams and prices.

Posted on Nov 24, 2010

  • 2510 Answers

SOURCE: I have a 31cc yard-man

The jets and/or passages are blocked and you are forcing extra fuel in to keep the engine running by choking it. Strip the carb and clean out the jets and valves and the needle valve and seat. Blow out all the passages if you can, but be careful of losing little screens etc. that may be in the passages. Do not use wire or hard object to clean jets, use a tooth pick etc. so as not to damage or enlarge the orifices.

Posted on Mar 14, 2011

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1 Answer

MTD lawn tractor will start but dies after 3 seconds no matter where speed control is moved or left, choke adjusted, etc. First starting after 5 months.

If your fuel valve fully ON? Is there dirt in the tank? Is the filter clean? These are the the first things you should check.

Apr 30, 2011 | Mtd Products Yard Machines 158CC Tiller

1 Answer

Tiller won't stay running

If you choke or prime the engine, it starts up for a second or two and dies, the carburetor need to be cleaned/repaired.

May 25, 2009 | Mtd Products Yard Machines 158CC Tiller

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