Question about Mantis 2-Cycle Tiller

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Two stroke engine won't run without choke. Whats the problem?

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Sounds like it is running lean. Look for loose carb or manifold nuts which will cause it to **** air and run lean, hence it needs more gas which is what the choke does. brucewo

Posted on Jul 05, 2010

  • mantispro Apr 20, 2011

    remove H (high) L (low) plastic caps to allow you to further adjust the flow and you will be going. H (red) further out about 11 threads exposed and L (low) about 8 exposed; adjusting the low side will stop the tines, but remove tines before making any adjustments, thanks

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I have a 2012 mercury 6hp four stroke that will not idle without the choke on


Hi, Lee and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting ***** set too low.
8. Air/fuel mixture ***** set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below. Good luck and have a nice day.
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Apr 13, 2016 | Motorcycles

2 Answers

If a 2 stroke dirt bike wont idle and the jets are clean what could be wrong


If it is older bike the reeds in the carb could be bad or going. Might what to check out the choke also.

Feb 14, 2016 | Motorcycles

1 Answer

I was using my o17 saw today it was runing Just fine I shut it off when I went to start it again it fired on choke seting after that I could not get it to do anything what is wrong with it


All 2-strokes love to run rich when cold thus full choke till it kicks, half choke to start and leave on for 5 seconds high rev's to warm & lubricate, then no choke to run. Restart when hot is 1 pull full choke (you are now flooded) & then no choke til it starts. Try it. Works every time on all of my 2-stroke engines.

Apr 22, 2015 | Garden

2 Answers

Why Tiller cranks but will not run when you need it to till?


If you don't have a manual, could can read/download it at this link.
If the engine stalls under load, the mixture may be too lean. There should be a mixture screw on the carburetor. Note its position, and turn it counter-clockwise 1/8 of a turn to see if there is any improvement in engine performance. Repeat this but don't exceed about a half turn.
The tank has a vent and this should be kept vertical under the cylinder cover in the small "pocket" in the cylinder cover.
Lack of power can be caused by a dirty air filter or blocked muffler screen.

See the article below for troubleshooting 2-cycle engines
String Trimmer Won Work 2 Stroke Engine and Carburetor Troubleshooting

May 30, 2014 | Mantis 2-Cycle Tiller

1 Answer

My chainsaw won't run without full choke on and


Fuel starvation, start by replacing the fuel filter in the tank, check the fuel hoses for leaks up to the carb.

May 22, 2013 | Garden

1 Answer

Honda nsr250 mc18


The NSR is a 2 stroke, so it needs 2 stroke oil as well as petrol. This is the reason they are known as "Stinkwheels". If the engine is run without oil in the mix it will seize. As the oil provides lubrication to the moving parts. You should also check the spark plugs are clean, they can oil up in a 2 stroke, especially if the engine is used a lot at low revs.

May 03, 2013 | Motorcycles

1 Answer

My chainsaw starts with choke when choke is off and i press trigger it just dies like its getting no fuel


Check the fuel filter, muffler, and air cleaner for plugging. Check the condition of the fuel lines for hardness, splitting, end rot, or kinking. Make sure the carburetor fasteners are tight. If no help, remove the lower carburetor chamber cover and examine the diaphragm and fuel metering valve that it controls. The diaphragm should not be hard, cracked or have any holes. The fuel valve has a rubber tip that may have deteriorated. If looks ok, then turn both L and H jet needles CW to stops (lightly), then back out CCW 1-1/2 turns each. Engine should start and run with these basic settings. Allow the engine to warm up, then pull the throttle full on. Adjust H needle CW until the engine speeds up somewhat, but is 4-stroking. Correct adjustment is when the engine continues to 4-stroke, but immediately 2-strokes when cutting. Allow to idle, and adjust L CW until the engine runs fairly well, but will allow the engine to 'follow the throttle'. Set idle speed screw so that the chain stops moving, but the engine continues to run. Hope this helps!

May 17, 2010 | Garden

1 Answer

I have a poulan pro pp4620avhd chainsaw. I can get it to start and stay running as long as I have the choke on. I can even run it at high speed using the choke control. When I pull the trigger to feed it...


Check the fuel filter and muffler for plugging. Check the fuel lines for condition. Check the carburetor fasteners for tightness. If the saw has a lot of hours, remove the lower section of the carburetor and check the condition of the diaphragm--it should not be hard/cracked. If everything seems to check out ok, Turn both jet screws CW to stops (lightly), then CCW each 1-1/2 turns. The engine should start and run--allow the engine to warm up. Pull the throttle full on and adjust H needle CW til the engine speeds up, but still 4-strokes. Proper adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Let idle and adjust L CW so that the engine runs fairly well, but allows the engine to 'follow the throttle'. Adjust the idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

May 11, 2010 | Poulan Pro Chain Saw 46cc 20"

1 Answer

Will only run if choke is on i cleaned carb.i think it may b the primer bulb.iv tryed changing the lines didnt help


Check the fuel filter in the fuel tank for plugging. The primer bulb only affects starting. Make sure the muffler is not plugged. If these things look good, try turning the 'H' needle on the carburetor CCW about 1 turn. If this allows the engine to run without the choke, allow the engine to warm up. Then, open the throttle full on and turn the H needle back CW until the engine begins to speed-up, but is still 4-stroking. Correct adjustment is when the engine will smooth out as soon as it starts cutting, but 4-strokes when not cutting. Hope this helps!

Feb 19, 2010 | Garden

1 Answer

I have a 1993 2 stroke 40 hp mercury outboard motor and it seems that whenever you start it you need to use the choke, even when it's been running for some time and warm. Is that normal for these motors?...


Use it .It is a common thing with 2 strokes.Outboards have water in them and cool down quicker than say a 2 stroke motorbike. They have no water and keep the heat in the engine longer.If it runs well,,don't spend the money.All the choke does is gives the motor a slightly richer air/fuel mix at startup.It cannot hurt the motor.Hope this helps

Jan 05, 2010 | Boating

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