Mantis

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

What is the gas to oil ratio for Mantis 2-cycle engines? Always make sure you use the proper 50:1 mixture ratio; that is 2.6 ounces of oil to 1 gallon of 89 octane or higher gasoline. If your engine is getting hot, you may not have enough oil in your gas mixture to properly lubricate the engine.
Adjusting the Idle Speed and Mixture

On some float-type carburettors, you can adjust the air-fuel mixture and engine speed at idle. Check for an idle speed screw designed to keep the throttle plate from closing completely, and an idle mixture screw that limits the flow of fuel at idle.

Features a powerful 2-cycle engine (requires gas/oil mix) with push-button priming for easy starts.
When the tines are facing the downward direction, this is considered tilling. When the tines are facing in an upwards direction, this is called cultivating.
Please, follow these instructions to clean your machine: a) Drain out the old fuel and dispose of it properly. b) Once the fuel tank is empty, push the primer bulb on your tiller 7 or 8 times to clear out any fuel in the carburettor.
The stoichiometric mixture for a gasoline engine is the ideal ratio of air to fuel that burns all fuel with no excess air. For gasoline fuel, the stoichiometric air–fuel mixture is about 14.7:1 i.e. for every one gram of fuel, 14.7 grams of air are required.
Q: How Do You Tell if a Carburetor Is Rich or Lean? A: One way to tell for sure is by “reading” the spark plugs. If the plug tip is white, the mixture is lean. If it`s brown or black, it`s rich.
If an engine is hard to start, barely idles, coughs, bogs, sputters or stumbles every time the throttle opens, gets horrible fuel economy, spews black carbon from the tailpipe or never seems to run very well, chances are the carburetor needs to be tuned.
To arrive at the most appropriate carburetor choice, there`s a basic formula: engine displacement multiplied by maximum rpm divided by 3,456. For example: a typical 355ci small-block—a 0.030-over rebuild—with a 6,000-rpm max engine speed would work well with a 616-cfm carb ((355 x 6,000) 3,456 = 616.32).
You can do so by adjusting the idle mixture screws to 1.5-2 turns out, and the idle speed screw to 1-1.5 turns in. Warm the Engine Up. The engine`s running temperature directly correlates with proper air and fuel mixtures. So, be sure to let the engine run and reach normal operating temperatures before proceeding.
Once air and fuel move through the venturi, they encounter another obstacle called the throttle plate, which is a disc that opens and closes to control the amount of air that enters the engine.
You can do so by adjusting the idle mixture screws to 1.5-2 turns out, and the idle speed screw to 1-1.5 turns in. Warm the Engine Up. The engine`s running temperature directly correlates with proper air and fuel mixtures. So, be sure to let the engine run and reach normal operating temperatures before proceeding.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Mantis tiller idle screw adjustment – Mantis 2-Cycle Tiller
ANSWER : Start out with 1.5 turns on High speed jdet and 1/2 turn on the low speed. Make sure plug is not wet, better yet install a new one. Clean, fresh fuel and give it a pull.

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I have a two cylinder Mantis tiller. It has locked up and the cord is locked. I am unable to pull the cord. Any suggestions? I was in the process of using the tiller when it felt as if it were running out of gas. It stopped on its own, and then it was locked up and I was unable to pull the cord.
ANSWER : Check the oil, if not full fill it, take the shroud off, should be for bolts, fit a socket on it with a breaker bar or ratchet and turn it a few times, then reassemble and start. Hope this helped Tim

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My Mantis Tiller won’t start and there is grinding type noise when I try and start it. I recently did some very lengthy trench digging over a period of about 2 months.
ANSWER : It sounds like the clutch springs may be overheated and the clutch shoes rub while you try to start it.If you loosten the screw that holds the engine to the gear box you can try to start it without the clutch and see if that is it.Good luck

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My mantis tiller starts but there is no input to the tines, what could be the problem?
ANSWER : Here is the parts breakdown. You should be able to fix it yourself.

http://www.alamia.us/Mantis_Tiller_Parts_s/149.htm

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Mantis starts fine then when it warms up it stalls when you pull the throttle. Is it the carb clogged up, or do you have any sugestions?? I have replaced the gas and oil??
ANSWER : Hello. the carb is partially clogged. do this. get a bottle of carb cleaner to add to the fuel. follow the instructions on the bottle regarding the amount.

also get an aerosol can of starting fluid and a helper. start it up and have the helper spray starter fluid into the air intake as you pull the throttle. continue until the clog is cleared. joe

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Tines continue to work with out touching safety or throttle. they engage as soon as I start the engine.
ANSWER : 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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The gears have locked up what is the problelm
ANSWER : Is the motor running and increasing power with movement of the throttle lever? If so then something is possibly caught in the worm gear mechanism.

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My Mantis Tiller 4cycle engine starts well but when I press the throttle completedly, the tines turn very slowly. This is a brand new tiller, used only twice. The engine is sitting all the way down on the worn gear housing.
ANSWER : I had same issue with my 2 year old 4cycle. Check if the carb is moving full stroke with throttle movement. I had almost no movement at carb at full throttle, found the trigger in throttle handle was cracked and bent rather than pull cable. I called mantis and they promptly sent a new handle bar ***’y with new cable, throttle ***’y Etc and that solved my problem.

BTW: If you cannot wait, I did figure out that if I pushed the carb to open with the throttle trigger fully pulled it would run at high, but when you let go…..LOL

Rich in Wethersfield, Ct

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