Question about Mantis 4-Cycle Tiller

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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.

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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

Posted on May 28, 2009

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1 Answer

Engine runs tines dont


The following was extracted from the Mantis owners manual..

At some point, you may find that the tines won't turn when you press the throttle. This may mean the engine isn't sitting all the way down on the worm gear housing. Perhaps you've been using your Tiller
for several years. Or perhaps you've removed the engine for use with the Mantis hedge trimmer attachment, then replaced it. In either case, the flange bolt may have come loose and lifted the engine up.
If this happened you'll notice a gap between the bottom of the engine clutch case and the top of the worm gear housing.

To fix this, loosen the flange bolt. Take the engine off the worm gear housing. Notice the hex head on top of the drive shaft . Inside the clutch case, you'll find the clutch drum. Make sure the hex head
lines up with the clutch drum inside the clutch case. Then put the engine back on the worm gear housing. Make sure the plastic carrying handle is not under the fuel tank. If you've followed these steps properly, there will be no gap between the clutch case and the worm gear housing. Make sure you tighten the flange bolt.

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1 Answer

When I Start Mantis Tilleer it starts in gear ( tines are turning)


The Mantis has a speed controlled automatic clutch.

Lower the idle speed by turning the idle screw counter clockwise. The idle screw is attached where the throttle cable meet the carb. The screw has a pointed end that resembles a pencil point.

The engine speed should be adjusted just above stalling.

If the tines turn even when the engine pull rope is pulled, the the clutch is defective and needs repairing.
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Just bought an older Mantis 2 cycle tiller. The tines engage when the tiller is started. Of course that makes it hard to start with the tines on the ground! I don't believe it was doing this when I...


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1 Answer

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1 Answer

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1 Answer

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1 Answer

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I had this problem today. Loosen the flange bolt. Pull the engine off and check that the hex end of the shaft is lining up with the clutch pad in the engine-that it seats properly. Then make sure the shaft is seated all the way into the worm gear and put the engine back on. You will probably have to wiggle the shaft until it seats into the clutch. Tighten the flange bolt when the engine is seated flush with the worm housing (with no gap). That's all I did and the power is back up. Hopefully you still have your manual with the parts blow-up. (page 29?) BTW, have you checked that the wormgear is greased?

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1 Answer

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