Question about Mantis Gas Mini Tiller/Cultivator, 2 - Cycle

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How do you compress piston ring in Mantis tiller to re-install

Is there a "shade-tree mechanic" trick to compress the piston ring so the piston can be inserted in the cylinder? Commercial compessor tools seem to be too large to fit in space available. Would a hose clamp work? My tiller is an SV-5C/2.

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I make one with tin snips and a tin can or sheet metal from an air duct. Make sure you have the ring with the right side "UP", the beveled edge (if there is one) goes up or toward the head.

Posted on May 27, 2010

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How to remove cylinder head of the 2 stroke mantis tiller to remove if any carbon on piston head

if it has head bolts , the same as any engine
if it doesn't , the cylinder will unbolt at the crankcase
undo those bolts and carefully pull the cylinder off the piston
mark the location of the cylinder so that assembly puts the exhaust and inlet ports in the right places
NOTE-- 2 stroke rings are pegged in the ring groove so when assembling the cylinder back onto the piston , ensure that the ring gaps are at the small peg or you will break the rings when pushing the cylinder down over the piston

Jul 26, 2016 | Mantis Garden

1 Answer

05 Troy built suoer bronco it has a 19 hp engine.

white smoke usually indicates excess oil consumption. make sure you can turn motor over by hand you should feel resistance when the piston is on the compression stroke ensure ignition is off to do this test. no ressistance would indicate low compression and possible cracked or broken piston ring or. worn piston rings. Test by putting a small amount of oil into combustion chamber the oil will temporarily help seal off the piston rings and result in more compression indicating worn rings.also oil filler breather cap blow by would indicate this as well hope this helps.

Sep 04, 2014 | Garden

1 Answer

Why no compression on mantis

One reason that I have seen for no compression on a 2-cycle engine like the Mantis is severe scarring of the piston, rings and/or cylinder. This can be caused by not mixing the fuel with the proper amount of 2-cycle oil. The engine will normally run for a while but eventually it will die and not start again. If you have a compression tester, I would use it to test your compression. If it is lower than around 120, you may have this problem. You can remove the muffler and looking into the exhaust port with a flashlight to see if you have scratches going up and down the length of your piston. If you do then you are looking at a sizeable expense of replacing the short block. If you can do it yourself, you might be able to do it for less than $100 but if you have to have a dealer repair it, it might cost more than the tiller is worth.

Jun 15, 2014 | Mantis 2-Cycle Tiller

1 Answer

New mantis worked perfectly last season. Stored it for the winter. Tried to start it this spring. Pull cord is frozen up. Can't pull it out.

First, call Mantis and get their advice. It may be covered under warranty (I believe it comes with a 2 year warranty). If not under warranty remove the spark plug and try to pull the starter rope. If you can pull it out squirt a little 2-cycle oil in to the spark plug hole and pull it out several times before reinstalling the plug. Then try to start it again. If you can't pull it out after removing the plug try removing the engine cowl that contains the starter rope and see if you can pull it out then. If you can't then there is something wrong with the starter rope mechanism. Try some oil or Liquid Wrench on the spring to see if you can free it up. If you can then the piston may be seized. Again, squirt a little oil ni the spark plug hole. Take a ratchet wrench and socket to put on the crankshaft nut. Try to turn it. Do not apply to much force. I would send it back to Mantis for repair or replacement unless you are mechanically proficient enought to take the engine apart. If you have been using the correct fuel/oil mixture this should not happen.

May 21, 2011 | Mantis 2-Cycle Tiller

1 Answer

4cyl Holda engines leaks oil out carb. All the oil in the sump will drain out through carb when pulling on starter. Refilled and tried again and oil emptied again

you are getting compression into crankcase, there is a crankcase vent that goes to the intake just behind were the carburetor mounts on the engine this is were the oil is getting into the carburetor, it is doing this because you have a hole or crack in the piston or broken piston rings, the engine will have to be rebuilt or replaced.

Apr 11, 2011 | Mantis Tiller 4 Cycle Engine Handy Item...

1 Answer

Weak compression

Loose spark plug, rings and/or cylinder scratched/scuffed (it doesn't take much) or hole in piston.

Aug 23, 2010 | Mantis 2-Cycle Tiller

1 Answer

I have a mantis 2 cycle tiller. it starts and runs for a minute then shuts off.

do a fuel system overhaul...but always w a 2 stroke pull the muffler and inspect the piston and cylinder if its not scored and you feel good compresion most likley its your fuel system. if it is scored it gets metal to metal and the hot metals expand.

Jun 22, 2010 | Mantis Gas Mini Tiller/Cultivator, 2 -...

1 Answer

Mantis 2-cycle tiller won't keep running

Hi Arch--
Sounds like the engine is not getting any fuel. You may need to remove and then clean out the carburetor. While it is all apart I would check that the float isn't broken or cracked. Carefully spray some compressed air through the carburetor jets and ports, as this will help you verify that all those tiny channels are open.
--Hope this helps.

Jun 15, 2010 | Mantis 2-Cycle Tiller

1 Answer

Mantis tiller rpms shoot way high with slight increase in throttl

It is leaking air into the intake somewhere or
the rings are shot
the crank seal is shot
the crankcase gasket leaks.

Jun 08, 2010 | Mantis 2-Cycle Tiller

2 Answers

Older Mantis 2 cycle must be choked to run

look on the side of the carb for 2 small adjusting screws they will be almost touching( they will have springs on the threaded part of the scews) the heads will be small 3/16 " open these counterclockwise, this allows more fuel in. The one closest to the engine is for the idle mixture the other is for high speed , tilling speed. 1/2 to 1 turn may help, good luck . try PER small engine tecnical forum online

May 20, 2009 | Mantis 2-Cycle Tiller

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