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

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Where can i find a carurator rebuild kit for my 21A-121R900 cultivator

My cultivator will idle just fine but as soon as i try to give it gas it dies. i have replaced the fuel lines and spark plug with no results.

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Posted on May 14, 2014

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Posted on Jan 02, 2017

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SOURCE: the cultivator is getting gas, the plug looks new but no fire

Check Compression, if you dont have a gage put your finger in spark plug hole it should blow it out.
Next check for spark,It should be a blue spark at plug.
Next put a little fuel in carb and see if it will fire.
Hope this helps. Let me know.

Posted on Mar 25, 2009

  • 61 Answers

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"

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SOURCE: My Yard Machine Tiller starter rope will not

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

Posted on Feb 27, 2011

  • 13 Answers

SOURCE: I have a yardworks snowblower

It is very possible that improper storage has left residue in your fuel system causing restriction of fuel supply. answer these questions and get a better answer. 1. Do you have to use partial choke or have to continually prime your engine to keep it running. 2. Look for physical damage to shutdown switch button or key switch wire. If this wire comes in contact with any metal surface other than its intended contact, usually near the engine. 3. Finally use an additive in your fuel system that attacks varnish such as carb and choke cleaner. In many severe cases your fuel system may need to be serviced by a professional familiar with the teardown and inspection of the fuel system. Good start though by changing your plug and fuel line antifreeze. As far as fuel stabilizers go I have been told but am still a novice when it comes to fuels that contain ethanol as I have heard that they may not have a very long shelf life. A few tips from an old ag. tech. Gods Speed to you! P.S. If this is a 2 cycle engine their are other things to consider.

Posted on Mar 01, 2011

  • 316 Answers

SOURCE: 21A-121R900 Won't stay running

hello sir, my machine will only start when pumping primmer bulb or squirting fluid in the carburetor than stops. the fuel line has broken off, in most small carburetors this is a ongoing problem.old fuel will crystallize when left in tank for a long time.plugging up ports, fuel lines, small screen in carburetor.fuel lines will dissolve clogging carb.this is why it will run when the choke is on creating a vacuum to where there is fuel forced in the carb to rum,also the gas will evaporate leaving the oil behind clogging up carb.the thing to do is remove carb. and clean out,replacing gaskets or fuel line if necessary.use carb cleaner to clean out carb.make sure to make note where fuel line go.the fuel filter broke off of fuel line letting debris get in carb plugging it up.the muffler is known to clog up a lot on these machines where they want run. the compression should be 60 to 120 lbs any thing below 60 is junk. when adjusting the carb screws turn in all the way than turnout 1 1/4 turns turn in slow until machine runs also you need to check for spark by removing plug and grounding against engine to check spark, ok.a new spark plug would be a good ideal too , if you are going to make these repairs use new fuel line and filter,hope this helps,any comments welcome,thank you, ~~

Posted on Feb 21, 2012

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1 Answer

CAN THE PULL ROPE BE REPLACED?


Yes.
It's a matter of dis-assembly, replace, and re-assemble.
You should be able to get thae part (and the work done) at any local small tool rental or service shop.

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How do I remove the clutch


Remove the power unit, remove the plastic clutch/ starter cover, install a piston stop, with a t25 torx driver inserted down the center tube on the clutch drum remove the clutch drum, then using the proper clutch tool remove the clutch paying attention to the arrow stamped on the clutch- usually left handed thread. be sure not to lose small washer between clutch and drum.

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I have a 1958 ford f-100 idles fine when i give it gas i can press pedal half way down but if i go to floor it sounds like a major air leak and the truck dies


You need to rebuild the carburetor is my opinion based on your symptoms. The carb rebuild kit comes with full instructions and you can get it here.

Oct 12, 2012 | Cars & Trucks

1 Answer

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,,

Jan 27, 2012 | Yard Machines Cultivator

1 Answer

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

1 Answer

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

1 Answer

21a-121r900 Yard machines tiller. Flywheel key part # or size????


You can download manuals here. Find your serial number also.
http://manuals.mtdproducts.com/mtd/Public.do?langId=-1&BrandCode=10451
Most motors have an soft woodruff key for flywheel,but this ond looks like it's splined, if it is the right model.

Aug 19, 2010 | Yard Machines Garden

1 Answer

Starts fine but dies when set to run.


You either have a air leak in a fuel line, carb jets are plugged, or carb seals went bad. They sell a rebuild kit for your carb, 10-15 dollars. I would start by removing carb spraying it with carb cleaner and blowing it out with a air gun, put it back on and see if this worked. If not I would replace fuel lines and rebuild carb.

Jul 25, 2010 | Poulan Garden

2 Answers

Engine bogs down when speed is increased.


Ok I have r Royobi Tiller (30CC Gas) And last year it ran fine after rebuilding the Carb. This year it was "hard starts" Idles fine, (Tiny whisps of blue smoke in exhaust with correct ratio) Even seems to run better with the choke "on" but still...at idle only. as soon as I touch the throttle...its bogs down in tune with how much gas I give it. Little throttle? Little bog down, Little more throttle? Almost stalls, a normal throttle rev? it stalls dead! Then starts right back up again in 1 pull and idles fine again!? WTF? So after cleaning a clean carb again, (twice) and seeing no change I thought I'd go look at the original diaphragm and compare it with the rebuild kit diaphragm (which is the one in the carb.) And guess what? The replacement has a larger rivet by a factor of "2". So basically it was flooding the carb, I bent the needle tang down, better but no cigar. But I could rev it half way now. A second disassemble to bend it yet a bit further and Vrooom vroom vrooom ****! So check your needle valve even though you think its 100%. (Especially if you rebuilt the carb with a kit!)

Mar 27, 2010 | Honda 25cc 4-cycle Mini Tiller

1 Answer

Troy built cultivator will only idle 26cc 5yrs old


Problably not sucking air, but not getting enough air. Does your cultivator use gas/oil mix or straight gas? If it is a gas/oil mix the muffler is probably stopped up with carbon and cutting off the air flow. Try removing the muffler and see if it runs better.

Jun 11, 2009 | Troy Bilt Tiller/Edger 26cc, Model No....

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