Thread: Help with a 2 cycle motor

Originally Posted by th3revolution

hi
i have a ryobi lawn hornet and i am having some troubles with it.
It was sitting for a while and when i pulled it out and tried to start it, it wouldnt.
So i first cleaned the spark plug and checked that i had a spark. All good. Then I discovered that the fuel lines were perished so i replaced them. I tried to start again and fuel just comes out the top of the carburetor. I have had the carb apart and cleaned it but it still wont go.
Could this be a problem with the diaphragm? I noticed that it was a little stiff

thanks

The diaphragm should be kind of soft and pliable, a little like a balloon. Replace it and make sure you put a fresh mix of new fuel in the tank. Petrol does go off sitting in a can for long periods of time.

i did put new fuel in it. made up a fresh batch.

Once you have let the cylinder sit for a while with the plug out to dry off any excess fuel, then replace the dry plug and give it a few pulls. Any popping sounds? Pull out the plug again and see if it is getting wet.

Not sure about your trimmer, but I know with chainsaws that you should only give it 3-4 max pulls with the choke on no matter what (else you will flood it), then switch it back to the normal running position and continue pulling.

it isnt igniting but there is the sound of compresion. The plug does get wet. Once i put fuel in it and put on the cap, the fuel starts bubbling up through the middle of the carby.

Are you 100% you connected up the right lines when you replaced them? From memory there should be two lines. One is the line from the tank to the carb, and the other is the impulse line which draws pressure from the crankcase and goes into the carb.

Also check you tank air vent is working. Also check your exhaust is not blocked. Sometimes wasps can build mud nests inside the muffler which will block the flow.

Yes. The lines are correct. It runs from the fuel tank to the primer, then to the carby. The second comes from the other end of the carby back to the fuel tank. The exhaust isnt blocked. I will upload a video of the problem.

When the fuel lines on a Ryobi get perished it sadly indicates she is ready for the scrap heap.

Save your money and frustration cells and move on..

Get a can of "Start Ya Bastard" from Supercheap

Originally Posted by dazzler

When the fuel lines on a Ryobi get perished it sadly indicates she is ready for the scrap heap.

Save your money and frustration cells and move on..

Yep. Chuck it.

Sounds like a blocked vent in the filler cap, this is pressurising the tank causing toooo much fuel into the carb then it floods.

thanks. i have got it going, but only for a few seconds at a time. Somehow air gets into the fuel line. I find that if i have the fuel tank to full, the fuel leeks out of the vent in the cap.

I had trouble with a whipper snipper 2 stroke motor not running well, and eventually tracked it down to a blocked muffler. Turns out the soot from the exhaust in time blocked the outlet from the muffler as it was quite small in the first place.