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Fuel line routing yard machine 31cc cultivator 21A - 120R000

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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"

  • edsanders360 Mar 10, 2011

    I have a tiller with a separate fuel primer bulb. I have two lines from the bottom of tank. One of those lines is connected to the fuel filter. The other is a hose only (probably for intake side of bulb?) I have two outlets on carb. One on the diaphragm side and the other on the return side of the carb. Any help would be greatly appreciated.

  • Lester McMurray Jun 09, 2013

    primer bulb pulls gas out of carb and into the tank.Watch the bubbles.

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1 Answer

I need parts for the IDC 400 31cc cultivator


ordertree.com has them for abt 50 dollar. part 753-04125, I believe its a mtd part. plus abt 10.00 shipping

Aug 25, 2012 | Yard Machines Cultivator

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I have a Yard Machrines by MTD Yard & Garden Cultivator 31cc: Model No.21A-121R900 Ser.No.1A246DG1150 and I need to replace the primer bulb. How do I do that?


hello l, how to change primmer bulb,,remove the two fuel lines making note which line came off where,use needle nose pliers to push the two ears down and pull bulb out,make note on where the long and short stem was at,go to the mower shop and get a new bulb and install,put lines back on, done start engine,,hope this helps,,

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My Yard Machine Tiller starter rope will not rewind - it is an MTD engine the model is 21A-121R900. Once I take the cover off I can't get to the rewind mechanism.


you can either drill the rivet out, or inside the shroud there are metal tabs that you can bend out, but be careful as not to break them off. Hope this helped Tim

Feb 27, 2011 | Yard Machines Cultivator

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I need a diagram for Yard Machines; garden cultivator; 31cc


Here is a parts breakdown for your machine (found under MTD) with parts listings, diagrams and prices.
http://www.partstree.com/parts/?lc=MTD&mn=21A-121R900

Nov 24, 2010 | Yard Machines Cultivator

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Clean the carb and make sure your fuel lines are in good condition.

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Cultivator won't start.


After sitting for that long the carburetor will gum up and not let gas through. Buy a carburetor repair kit and replace the diaphram and gaskets. Be sure to make a sketch of where the fuel lines are routed to. It's easy to forget where they went and a headache to try to figure out. If it has a primer button I would replace that also.

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Tiller wont get fuel to start


Try disconnecting the line at the carb. Then carefully blow back to the tank. It may have something blocking the outet from the tank. If that doesn't do the trick, the float may be stuck and not allowing the needle to open for fuel to enter the carb bowl. Good luck...Lee

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