MANTIS TILLER WITH HONDA GX25 ENGINE STARTS FINE BUT WHEN GIVEN THROTTLE DIES OUT. ALSO A LITTLE WHILE BACK OIL WAS COMING OUT OF CARB BUT THIS HAS NOW STOPPED. THIS IS A 4 STROKE ENGINE WITH APPROX 4 HOURS USE. E.MAIL. [email protected]

If your unit has a primer bulb, start your engine . When it starts to die push your primer, if the engine comes back to life you have a carb issue.

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

Honda GX25 GX35 manual on PDF.
http://www.smallenginewarehouse.com/images/manuals/GX25-35.pdf

Clutch or transmission, a common problem with FG 100 series Honda.

Ok I have r Royobi Tiller (30CC Gas) And last year it ran fine after rebuilding the Carb. This year it was "hard starts" Idles fine, (Tiny whisps of blue smoke in exhaust with correct ratio) Even seems to run better with the choke "on" but still...at idle only. as soon as I touch the throttle...its bogs down in tune with how much gas I give it. Little throttle? Little bog down, Little more throttle? Almost stalls, a normal throttle rev? it stalls dead! Then starts right back up again in 1 pull and idles fine again!? WTF? So after cleaning a clean carb again, (twice) and seeing no change I thought I'd go look at the original diaphragm and compare it with the rebuild kit diaphragm (which is the one in the carb.) And guess what? The replacement has a larger rivet by a factor of "2". So basically it was flooding the carb, I bent the needle tang down, better but no cigar. But I could rev it half way now. A second disassemble to bend it yet a bit further and Vrooom vroom vrooom ****! So check your needle valve even though you think its 100%. (Especially if you rebuilt the carb with a kit!)

what is your proper mixture?50:1?
Be sure you are mixing 2cycle oil to 1 gallon of fuel or whatever it takes to make this ratio
My reccomendations are run 40;1 3.2 OZ OF OIL TO ONE GALLON OF GAS
also you may have a lean out condition and the H on the carb, may need to be ritchened a little

Motor should not be screaming you should have a slight blubber when throttle is held wide open

Hi Don. There are two adjustment screws on the carburetor. Start the engine and while it is idling, turn the screw closest the engine (low speed adjustment) counterclockwise until it starts to falter, then back a 'hair' and try the throttle again. If that doesn't work, I would recommend doing what I usually do... put a new carb on and be done with it! Carb is a Zama C1U-K54A

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

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

jj505 has good and bad information.
Honda GX25 is a 4 stroke motor, with oil lubricated crankcase.
Oil drains out the filler.
Oil and gas do not mix on this four stroke.
The PDF below is the Honda manual.
http://www.smallenginewarehouse.com/images/manuals/GX25-35.pdf