I cranked the mower and it idles great but will not idle up to medium high even when I move the throttle. I removed the air filter, soaked it in gas, removed the carb and soaked it in gas over night hoping it would clean the high idle port on the carb. I checked the linkage & even moved the throttle to high and still the same problem, it only wants to idle. The diaphram/gasket looks good. Could the coil be bad? Bad gas? I'm scratching my head here... Thanks for any help.
Does the engine want to bog down when you move the throttle? Or does it do absolutely nothing?
If it bogs down when you try the throttle, It could be:
water in the gas
bad or distorted diaphragm (if no float)
stuck needle valve
stuck float
I’m happy to help further over the phone at https://www.6ya.com/expert/karl_14766549451f8563
SOURCE: mower will not run in high speed idles at one
Your carbs main jet is most likely blocked. When the throttle goes off the idle jet to the main jet there isnt enough fuel flow and the engine stalls.
You need to removed the main jet and run a small piece of wire through the main jet to clear it. This is a good time to look at the inside of the float bowl to see if you have excessive water, rust or dirt accumulating that is a sign you should clean and drain the fuel tank and lines as well. The main jet is actually the bolt that holds the fuel bowl on the bottom of the carb! You need to look very close at the jet near the top of the threads to see the little whole there and clean it. A wire brush to clean off the threads and fine piece of wire strand to clean the hole will do the trick!
If you dont have a bowl type carb you will need to remove the carb from the fuel tank and locate and clean the inlet screen and main jet and then remove the fuel tank and clean it out too.
Good luck and be careful.
SOURCE: after the engine began hunting i cleaned out the
did you replace you diaphrams or just clean them, does it have a float bowl or just diaphram? sounds like during all you cleaning you did'nt adj the tab to the needle, therefore diaphram is not opening needle which is not giving gas to the carb. tab should be flush with carb body and when you push on it needle should move to open and let fuel in, good Luck
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Thank you for the replies. The carb is not a bowl type carb, As for the main jet, is this the jet that has the spring on it? Also, there is a plastic tube that goes into the tank that fits on the side of the carb, it is clean as is the screen. Is the main jet the plastic tube that sits in the middle of the carb? If so, what is a good tool to remove it - I just left the gas station & noticed the gas tanks say cantains up to 10% Ethanol, could this be the problem as well. I have not removed the fuel tank and cleaned the tank. Thanks....
Ok, it's fixed...Found the main jet and removed it and put a paper clip through it and blew the rest of the carb out. Running like a champ. Thanks for this site and the help=
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