U K4589A.

The priming pump does not suction, gasoline enters the chamber only passively, when gas tank above carburetor level.
What I have done:
Changed spark plug, air filter
Changed all membranes and gaskets
Changed inlet needle, spring, lever and pin, adjusted lever.
Basic adjustment of high and low screws.
Situation after same as before.
I wonder whether there should be a valve in the gas inlet? When putting a plastic hose on the inlet and checking by mouth whether there is a valve function I cannot find one. Air goes in and out both ways.
2-Cycle Tiller

Experienced gardeners share their insights in answering this question :
Hi there is a small stone fuel filter in the tank. this filter stops fuel from running back into the tank from the carb check to insure it still on and make sure there are no cracks or hole in fuel line that should fix your problem

How to Identify and Fix Common Gardening Problems ?

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You could have a clogged fuel cap, which can prevent air from entering the gas tank. Loosen the gas cap a little and start the tiller again. If it starts and stays running, try cleaning or replacing the gas cap. A clogged carburetor could also be the problem.
If the rotary tiller still doesn`t start:

Check that the fuel tank isn`t empty: if necessary, add fuel. The fuel must be fresh, of good quality and clean: make sure that no dirt, water or incompatible fuel (such as petrol-oil mixture, if the engine is a 4-stroke) gets into the tank.

You should change your tiller oil at least every spring, but ideally after every 50 hours of operation. Between oil changes, check your oil level before each use to ensure there`s enough oil present. Small amounts of oil may burn off during use, so you may need to occasionally top it off.
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.
The extra-wide Mantis XP rototiller is designed for large gardens and yards and is powered by an easy starting Honda® 4-cycle engine.
If your engine turns over or cranks, but doesn`t start, it could be due to a dirty carburetor. When there`s too much dirt in the carburetor, the required combination of air and fuel can`t travel through the passage to the engine, causing a turn over, but no catch or actual start. It`s running lean.
Can a tiller cut through roots? Tillers can cut through smaller roots without much problem. The maximum size of roots that the machine can cut through depends on the tiller`s size and power, as well as the blades` size. However, running into overly large roots can stop, or even damage your tiller.
What lubricant should be used in the tiller transmission case? In the past the rule was: For partial fill-ups (a few ounces or less) use SAE 140, SAE 85W-140 or SAE 80W-90 weight gear oil with an API rating of GL-4 or GL-5. For full replacement use SAE 140 or SAE 85W-140 gear oil with an API rating of GL-4 only.
Put simply, a garden tiller is designed to break up hard, compact soil into loose, broken-up dirt that can then be used for planting.
The plug will depend on the SV number on your engine; the gap will be the same for each engine – . 024-. 028.
Use a 40:1 two-cycle oil mix ratio. One gallon of gasoline combined with 3.2 oz of two-cycle engine oil. Unsure of the age of your equipment? Use the 40:1 mixture.
The Mantis 2-Cycle Plus Tiller/Cultivator is easier to start with FastStart technology – a spring-loaded ratchet-coil that adjusts the piston and compresses the air while delivering fuel directly to the ignition point.
Common gasoline and oil mix ratios are 50:1 and 40:1. Meaning there is 50/40 parts gasoline to one part oil when mixed. The lower the mix ratio number the more oil per volume in the gasoline. To mix properly add oil to your gas can, then add fresh gasoline from the pump.
It is easy to carry anywhere. The handles fold down so it will fit in any car trunk and it takes very little space to store.
With The Mantis Tiller/Cultivator you can till to 10″ deep. Uniquely designed tines help Mantis dig deep even into the hardest soil, instead of bouncing around like other mini-tillers.
If the wheels on your tiller move but the tines don`t spin, you may need to replace tine shaft clevis pins or replace the transmission. The tiller`s transmission drives the wheels and the tine shaft, so you`ll likely need to replace the transmission when the wheels spin but the tine shaft doesn`t move.
Should You Wet the Ground Before Tilling? If the garden soil that you are planning on tilling is too dry, you should consider adding water to it before you till. Less is usually more, but water to a depth of about 4 inches. Let the water penetrate the soil before you begin the tilling process.
Should You Wet the Ground Before Tilling? If the garden soil that you are planning on tilling is too dry, you should consider adding water to it before you till. Less is usually more, but water to a depth of about 4 inches. Let the water penetrate the soil before you begin the tilling process.

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2 stroke Mantis Tiller
1) Very difficult starting, when started, high rev works, but
2) Engine dies on deceleration.
Carburetor is signed C1U K4589A.

The priming pump does not suction, gasoline enters the chamber only passively, when gas tank above carburetor level.
What I have done:
Changed spark plug, air filter
Changed all membranes and gaskets
Changed inlet needle, spring, lever and pin, adjusted lever.
Basic adjustment of high and low screws.
Situation after same as before.
I wonder whether there should be a valve in the gas inlet? When putting a plastic hose on the inlet and checking by mouth whether there is a valve function I cannot find one. Air goes in and out both ways.

ANSWER : Hi there is a small stone fuel filter in the tank. this filter stops fuel from running back into the tank from the carb check to insure it still on and make sure there are no cracks or hole in fuel line that should fix your problem

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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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My mantis tiller has a weak start. Tiller will not start. I have put a new spark plug, gas and gas filter, and a clean air filter. Has a weak spark. Can you advise me please? ED
ANSWER : If the spark is weak, try disconnecting kill switch, still weak need new ign module

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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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Couple of guys tried to help me on this, perhaps you guys could come back. I forgot to mention there is a pressure tank bladder type on the discharge side. Could the air in this tank be messing with the prime. I checked the intake. It has water in it after bleeding air from the discharge system where before it was dry before purging air. I think there is air in the system and wonder if it is coming from the pressure tank?. i open up one of the discharge valves and a lot of air comes out. Should I put a valve on the pressure tank to take it off line until I get water from the well?

Mar 12, 2010 – Could it be the check valve? I took it off and the flap appears to be working correctly. This well has been here a long time. Never given me any problems. I do have galvenized couplers on the discharge and intake sides. Old. Could these be leaking even though they show no sign of water? The discharge is able to hold 30 pounds easily overnight. I do not hear any vacuum in the intake when I take it off. Could the pipe to the well have a leak? I know I would have to insert a sleeve but I do not want to go through the hassle if I do not have to. I had put on a brand new pump from the hardware store that did the same thing so I think that would elliminate the pump as being the problem.
I disconnected it for the winter and rehooked it up. The galvanized couplers on the discharge and pump side are old but do not appear to be leakeing as I taped them well. The check valve seems to be functioning well as I took it off and the flap works correctly. The well is not pulling water. there does not appear to be a vacuum on the check vale when I losen it. could the check valve be bad? I am aware I might have to resleeve the well, but do not want to hassle with this if I do not have to. I want to eliminate everything else first. i put another brand new pump on it to see if it was that. That partiuclar pump which was the same thng did not work either.
I took the pump nose off and looked at it. The one way valve appears to be working fine. The impeller is working fine also evidenced by when I turn it on witht the discharge cap off, water shoots out. When I open one of the discharge valves and turn it on, the pressure drops to 10lbs. At this point the prime water has moved through the pipe and and the pump does not soound like it has any water in it. I pull the cap off and have to “reprime it again.” It again goes back to the pressure gauage rapidly fluctuating while pump on. I disconnect pump on intake side I hear no vacuum. The guage is on the discharge side. The seals on the pump nose do not look frayed or damaged. The pump is not leaking water in any of the joints. The pipes on discharge and well side do not appear to be leaking.

ANSWER : My friend, please boil your question down. Your title has to do with riding mowers but the leaking, bladder, impeller, air bubbles, pressure tank, check valve comments seem to be migrating toward a pump of some kind – well? spa? pool? irrigation?

Briefly, any system that involves a water source, a water moving device, water storage device and ultimate useage is subject to leaks … into the system and out of the system. If this is a well and you have air in your system, your pump may be sucking air at the well or any loose connection between the tip of the pipe and the inlet to the pump. Your bladder could have failed but from what I can get from your comments, this is not the case. On the pressure side, neither air nor water will leak in … only out.

Please recheck all connections. Make sure your check valve is installed correctly and not leaking. The check valve assists the foot valve, which may have failed.

I am more inclined to think your well may be at the end of its useful life. To prove or disprove, you could have a plumber put a vacuum gage on your pump. He or she can answer this question is about 90 seconds based on this test. Expect to pay for one hour of time, which will be less than the time you have already invested in your project.

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Mantis tiller 2 cycle will not accelerate. idles fine accelerate it stalls. Already replaced fuel filter, cleaned air filter, replaced gas, replaced spark plug. Only has about 20 hours on it.
ANSWER : I would pull the tines off of the transmission. You probably have some debris wrapped around the transmission drive shaft(s).
Please let me know.

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Mantis-20 will not start – have tried new fuel?
ANSWER : Hi, chances are the old fuel has gone bad and caused the spark plug to get muck on it, i would go out and buy a new spark plug then leave the plug out but fitted to the ht lead, then rest the plug on a metal part of the engine then try stating it and make sure you have a good strong spark between the gap in the plug, if you have a good spark then take the plug out the ht lead but also leave it out the engine, then keep pulling the starter for about 20 to 30 seconds to ensure you have only the new fuel coming through into the combustion chamber, you should be able to smell the fuel after few seconds, then put the spark plug back in and try starting it, you should find it will now start.let me know how you get on or if you need further assistance ok

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