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I have installed a new coil on my mantis tiller. should it be touching the magnets on the flywheel? The tiller will start but will not idle or continue to run.

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It should NOT be touching or scraping. There should be an "air-gap" of approximately .010" between them. This is about the thickness of a standard business card which is commonly used to set the gap, due to the magnetic nature of the flywheel (steel feeler gauges get stuck). Get a card and fold it in two. Then you loosen the hold down bolts (no need to remove them) on the ignition module and slide the card between the pick up legs and the flywheel, Then, you rotate the flywheel until the magnets in it line up with the legs on the module, drawing it into it. Then, tighten the screws, withdraw the folded up business card and recheck the "air-gap." If the machine will start, but won't idle or continue to run, you may have a fuel related issue (carburetor). Please post back for more help. We will see your comment and reply.

Posted on May 28, 2011


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NO FEELER GAGE REQUIRED! Read through these steps first and get the concept in your mind before you proceed.

  • Remove coil wire from sparkplug if attached. ( always the first rule!) Verify there are no metal shavings or rust stuck to the flywheel magnet. ANY SUCH will prevent operation!
  • Loosen the screws of the coil so that it is snug but moveable and place the coil and flywheel magnet in direct alignment,
  • Secure a sheet of notebook writing paper.
  • Cut the paper so you have 3 layers of paper the width of the edge of the flywheel.
  • Move the loosened coil away from the flywheel and place the 3 layers of paper in the gap with no metal touching.
  • Allow the coil to fit up to the magnetic field.
  • Gently pull the flywheel toward the coil to allow for any clearance or wear in the flywheel bearing.
  • Verify the coil is still snug to the paper and tighten screws of the coil.
  • Turn flywheel with your hand and verify there is a gap.
  • Apply small sideways pressure again toward the coil as you turn the flywheel. Again, there must be NO contact.
Once you have success with the above, you may test the output of the coil by placing the removed sparkplug on the plug wire. With the threaded end touching or clipped to the engine metal, whirl the flywheel quickly with the magnet passing the coil. You should see or hear a spark at the thread end of the plug. Easy!

Oct 27, 2016 | Troy-Bilt Garden

1 Answer

Old troy bilt tiller has no spark

If the tiller has been sitting for some time, it is possible that rust has built up on the magnets on the flywheel. If you remove the flywheel shroud you can use some sandpaper to shine up the magnets and the area of the coil just above the magnets. If this is not the problem, you may need a new coil.

Oct 13, 2014 | Garden

1 Answer

Won't start. have replaced plug and cleaned filter. any suggestions?

check and see if your coil is grounded,if not clean flywheel magnet and check for spark if no spark replace coil,

Jul 28, 2009 | Mantis 4-Cycle Tiller/Cultivator with...

1 Answer

I Have a Mantis tiller that I can get NO spark

set the coil to the thickness of a dollar bill from the flywheel and tell me what happens. make sure kill wire isn't grounding somewhere else

Jun 07, 2009 | Mantis 2-Cycle Tiller

2 Answers

No spark

No spark can be several things but begin with the easiest first.
  1. Ensure the grounding wire (thin black wire) that connects to the coil is not grounded.
  2. Ensure sure the plug wire end is connected well to the plug wire, some of these clamp the wire interior cord to the metal wire end by wrapping and crimping around the plug wire.
  3. Make sure the ignition generator coil is not scrubbing against the flywheel, there should be .030 air gap between the coil and the flywheel magnets.
  4. If you are mechanically savy, remove the flywheel and inspect the breaker points, replace/adjust as needed.

May 26, 2009 | Mantis 2-Cycle Tiller

2 Answers

What is left to do but change the flywheel?

check what they call air gap between the coil and flywheel .010-.012 gap
also be sure your flywheel is in time.
you will actually have to remove it to do this and check for the sheared key or be sure the key way aligns with the crankshaft keyway on the flywheel

May 17, 2009 | Mantis 2-Cycle Tiller

2 Answers


What kind of engine is it ? Does it have a float carburetor or diapram carburetor ?

May 09, 2009 | Mantis 2-Cycle Tiller

1 Answer

Flywheel magnet came loose

Hello, my name is Mark
Sorry to say but the only way to fix it is to replace the flywheel. After you put the new flywheel on you will have to double check the gap between the flywheel and the coil if you take a business card it should just fit between and should be a little snug. If the coil is off a little you will have problems starting. You can adjust the gap by loosening the 2 bolts on top of the coil lust enough that you can tap the coil towards the flywheel, just before you loosen the bolts turn the flywheel so the magnets on the flywheel are not where the coil sits but just to one side or the other of the coil, then set the gap, tighten the bolts and turn the magnets are where the coil is with the business card in between. It should be fairly snug to where you can just get the card out and not tear it in any way. Put your cover on and check for spark and you should be ok. Any questions please feel free to ask. Good luck and have a nice day.

Mar 25, 2009 | Troy Bilt, Tuffy, Rear - Tine Tiller, 4.0...

1 Answer

Mantis tiller sv-4 echo engine: no spark from coil

There are only 4 parts to the 2-stroke Mantis ignition system: the spark plug, the "kill button", the flywheel with embedded magnets, and the coil with integral plug wire. There are no "points" to clean or refurbish. If you've tried a new spark plug, unplugged the wire leading up the handlebars, and the magnets on the side of the flywheel are strong enough to attract a screw driver blade, then it must be a bad coil. That's all it could be. End of story.

Cruising the internet I see where these Echo coils go bad all the time. You can order the coil, but if the machine hasn't run in several years the carb will also need cleaning. So one thing leads to another. The gear box grease also needs replacing each year. What I'm trying to tell you is these are disposable tillers and due to length of time, incomplete care/ storage, ....whatever, this one's time is up.


Feb 26, 2009 | Mantis 2-Cycle Tiller

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