Question about Mantis 4-Cycle Tiller

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Dies out at high rpm

It starts and runs fine. if the throttle is half or full it dies out. changed the oil and gas. still the same problem. can anyone help?

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  • gtp250ex May 09, 2009

    thanks for the help but there is no bolt or a bowl. this is a honda gx25 4 cycle.

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Bolt on bottom of fuel bowl is actually a metering jet.take to lawnmower parts supplier to get replacement $7.00 appx.

Posted on May 08, 2009

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Posted on Jan 02, 2017

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So my snowmobile will not start without putting gas in the carb or starting fluid


Try to give it throttle as soon as it starts, hold it about half until the engine runs at a high rpm. Then keep doing that until it idles fine. You might have to adjust the idle and mixture screws. Good Luck!!

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Starts with starting fluid runs for a few seconds then shuts down


Good test. Do not keep doing that.
Make a new and accurate gas/oil mixture. Empty and refill. Secure cap. Be sure to flood system during start attempt. Can you smell gas? Oops, too much, better wait 30 seconds for full evaporation.
Two little screws near carb. Both are actually needles and probably have a visible spring which keeps them from vibrating to a new position while in use. One fuel/air mixture at low idle (start). One fuel/air mixture at high RPM.
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Smile always.

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1 Answer

Wont run hard start, run for five min or less then wont start


Many chainsaws have the fuel tank mounted very close to the engine cylinder. In the process of filling the tank over and over a lot of mixed gas is spilled and some of it runs down on the cylinder head. Being mixed gas and having oil in it, it leaves an oily residue. This oil will seem to collect a massive amount of sawdust over time. The sawdust coating the cylinder causes it not to cool down really well and the increased heat can cause the fuel in the tank to boil if it's bad enough. If the vent in the fuel cap is plugged and the gas in the tank gets hot it tends to pressurize the gas tank. This can cause the saw to flood out or load up.

Change the gas cap or clean out the vent filter. If you can get to the cylinder clean all excess oily sawdust from the cooling fins.
If you get the saw running your probably should readjust the mixture settings.

You need to set the mixtures for the carburetor. You will find a Low and High adjustment screw. At idle turn the screw in or clockwise until the rps starts to decrease. Then start turning it out till you hit max idle rpms. Turn screw back in a quarter to half turn and it should be idling smoothly. Be careful here and get someone to hold saw if necessary but hold in throttle to full speed and do the same with high adjustment screw. turn it in till rpm starts to drop then back it out until you get to max rpm and it won't go any higher then turn it back in a half a turn.

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