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Powerhouse tiller viper 2 cycle 43cc engine replaced primer bulb now won't start.

New gas mixed with new oil. Plug is good - getting good spark at the plug. After replacing the primer bulb, it ran a few seconds. Now it will not start.

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Overhaul the carby with new diaphragms or new carby
( almost as cheap from e-bay as a overhaul kit from the mower shop)
if no carby bowl , the diaphragms that pump the fuel will be hard and nor seal properly on the seats

Posted on Apr 25, 2017

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Weedwacker has fire to the sparkplug and new gas to the primer bulb but will not start


sad these little gas engines always fail when we don't want them to . requires a lot of compression to run and if not properly oiled thru the gas will fail .

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Mantis tiller problems


First, I would mix up a batch of fresh fuel. Stale fuel will prevent a 2-cycle engine from starting. If it still will not start, you need to determine if the engine is getting fuel and spark. Remove the spark plug, re-hook it to the spark plug wire, ground the plug against a metal part of the head near the spark plug hole, and pull the rope to see if the spark plug is producing spark. You may have to do this out of direct sunlight to get a true reading. If you have spark, spray some starting fluid into the spark plug hole, reinsert the plug and try to start it again. If it starts then you have a fuel problem which could be a bad primer bulb or a carburetor problem. If it will not start then you may have low compression which is an expensive repair. Try these things and post back.

Aug 14, 2014 | Mantis 2-Cycle Tiller

4 Answers

Tiller will not start


Check first whether you are actually getting a spark. Remove the plug, re-attach the spark lead and place the body of the plug in contact with the engine block. If the engine has a cowling which makes this difficult, you can use a socket from a socket wrench set or something similar to bridge the gap. Alternatively get an assistant to hold the plug against the engine with a plastic clothes peg. Pull the cord and check the spark is ok. It may be easier to see it in the shade or indoors (Don't run an engine too long indoors).
Problems with 2-cycle engines are often due to fuel flow issues in the carburetor. If the engine has a primer, make sure it is sucking up fuel. Look inside the tank and check that gas runs out of the return line when the button is pressed (the line without the filter).
Clogged jets can cause problems. These can be cleaned with a carburetor cleaning aerosol.
The valve in the gas tank cap can become clogged with particles of dirt. Check this is clear.
For a pictorial guide to cleaning a carburetor on a 2-cycle engine (used on string trimmers, chain saws, hedge trimmers and some lawn mowers), see my guide at the link below
String Trimmer Won Work 2 Stroke Engine and Carburetor Troubleshooting

May 16, 2014 | Mantis 2-Cycle Tiller

1 Answer

I have a sears 2 cycle mini tiller that worked great for the first hour but now won't start.


Do not use pre-mix fuel. Clean carburetor. Check age of gas. Cannot be more than 30 days old.
Make sure to use fresh gas w/synthetic 2-cycle oil @ 40:1 ratio (1 gal.) Gas to 3.2 oz. Oil) .Do not use old or stale oil/gas mixture. Always use the proper oil/gas mix. If you do not, your engine will suffer rapid, permanent damage.
check age of gas. Cannot be more than 30 days old.
Make sure to use fresh gas w/synthetic 2-cycle oil @ 40:1 ratio (1 gal.) Gas to 3.2 oz. Oil) .Do not use old or stale oil/gas mixture. Always use the proper oil/gas mix. If you do not, your engine will suffer rapid, permanent damage.

Oct 10, 2012 | Craftsman Gas Mini - Tiller/Edger

1 Answer

Earthquake tiller viper 43cc engine will not start


I have the same issue, I thought it was the carburetor so I cleaned it and put it back together, same issue, I put a new carburetor on it same issue, has great spark, if I spray carb cleaner into it, it will start and run for a few seconds even throttle up, but then it dies, and will not start again without carb cleaner spray, and fuel is fresh and properly mixed, very confusing indeed.

Apr 17, 2012 | Ardisam Earthquake Mini Cultivator 43cc...

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If you lent your tiller to your "know it all"


While having your brother buy you a new tiller sounds good, it just might not be practical or posible. So drain the fuel from the tank, fuel lines and the carb., clean the spark plug and replace fuel filter if installed. Put the proper gas in and start it, should be good or clear up pretty quick. Hopefully it did not run with the wrong fuel for too long where the spark arrestor in the muffler would get clogged up.

Good luck.

If really helpful, please rate.

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Mantis tiller will not start. Cannot get primer bulb to draw fuel.I replaced all of the lines,primer bulb still won't work. Tiller will start by priming cylinder by removing spark plug. Help?


Make sure there are no leaks in the bulb. Did you reattach the fuel lijnes correctly? You should feel resistance after pushing 3 or 4 times to ensure fuel is getting to the carb. If necessary replace the bulb. Otherwise check with Mantis at www.mantis.com or give them a call for troubleshooting assistance.

May 22, 2011 | Mantis Gas Mini Tiller/Cultivator, 2 -...

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Engine wont start. Changed plug; mixed new gas/oil combination. No start!


if you have a spark at the plug try cleaning the air filter, could be just dirty

Jan 07, 2011 | Mantis 2-Cycle Tiller

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2 Cycle Gas Trimmer will not start


it is normal to see air bubbles in line when pumping the bulb. to make sure what the problem is, try starting several times, remove spark plug. if dry, yes no fuel, remove the carb. if wet, place plug on engine block and look for blue spark. no spark means you need new plug, plug cord or ignition module

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