20 Most Recent Honda 25cc 4-cycle Mini Tiller Questions & Answers

Question edited for clarity. Question moved from Cars and Trucks.

GX25 Engine Assembly Information

honda-engines-eu.com https://www.honda-engines-eu.com > files > files PDF TORQUE: 6.4 N·m (0.65 kgf·m, 4.7 lbf·ft) Wait for approximately 60 minutes after assembly before filling with oil and starting the engine. EXHAUST VALVE INTAKE ... 1 page

GX25 Engine Adjustment Information

Rentamaxcr.com https://rentamaxcr.com > GX25 ajuste de motor PDF Valve clearance inspection and adjustment must be performed with the engine cold. ?. Remove the 5 x 12 mm hex bolt and remove the top cover. ..

Not sure about the tines but it sounds like you overfilled the oil

I'm big on synthetic oil because it protects better and lubricates better. I would be using 10/30 in the Tiller.

Hello. you have some gunk in the carburator. Get a can of starter fluid or carburator cleaner aerosol and a helper. Remove the air filter and start it up. Spray a little starter fluid into the air cleaner to keep it running for three or four minutes and the problem should clear. If it does not clear the carburator will have to be disassembled, cleaned and rebuilt. j.

check for a full fuel flow to the carby indicates a low fuel level possibly float level check that there is a heat insulation block between the head and the carby maybe head heat is tending to boil off the carby fuel if too low a level

Remove the fuel filler cap and with a bent piece of wire hook the black pipe out of the fuel tank. The filter is on the end of this.

1- http://www.alamia.us/category_s/777.htm?gclid=CMKhnqnT9JoCFQoMDQod7U3Ndw

2- http://www.planopower.com/store/honda/fg100.shtml

it will take oil untill you can see it near the filler cap.

-What do you mean or need to know...? Mai

-Open oil filler cap or plug at front (Flat Plastic knob) then just till to the front to drain it until no drip then just re fill w/ 10w30 to full level. You're good to go. Good luck Mai

-10 w 30 should be fine. Mai Lor

I have a similar problem.
The first time it was cause by the ethanol in the gasoline. It deteriorated the carberater rubber membrane so that it had a crack in it. The carberater would run lean. Take off the primer bulb and there is a plastic cover that goes over the rubber membrane. Remove that cover, and check the membrane. If this has a crack, you can order another from a honda dealer. It is about 14 dollars. After that just use ethanol free gas. Search the internet for a local source.

The second problem I had developed a little later. The engine would start, but if I gave it full throttle, it would quit. It got worse and worse till it would run at all. I noticed when I loosened the Gas cap, then the engine would run. And when I loosed the cap, I heard a whoosh, like air being sucked in.
So I figured the cap wasn't breathing like it should, which cause a suction in the gas tank. So I took a diaper pin and went through the holes on the inside of the cap, and through the little rubber plug in the center of the inside of the cap, several times. This allowed the cap to breath. Now it runs great.

It sounds like a carburetor fuel issue. Which you could try attempting to adjust the carburetor (or have someone else do such) to see if that cures the problem.