20 Most Recent kawasaki Fh680vgs24 23hp 23 Hp Lawn Mower Engine Motor () - Page 6 Questions & Answers

It sounds like you have not primed the fuel system after changing the pump and filter. You need to purge all the air out of the system to avoid the problem you have been getting. Refer to the manual as this will tell you how to do it on this model. If you don't have a manual, then you probably should not have tacked a job like this. I is always best to have manuals when you tackle repairs to equipment so as to avoid this sort of issue. If you continue to crank it and let it splutter, it may eventually purge all the air and start to run properly. Worth a try.

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If the mower has been in storage it is likely that the fuel has evaporated from the carburetor leaving a residue behind. This residue prohibits the fuel from reaching the fuel jets. When choking the carburetor fuel is drawn into the intake and mixing with air an except-able combustion mix is achieved allowing for short runs. Drain all the fuel from the engine and replace. Use a carberator additive that will clean the carburator. Attempt to maintain combustion by throttling the choke. If after several tryies you are not able to sustain engine running even with a paritial choke you will need to clean the carburabator. Hope this had helped?

Sounds like bad valves and too much oil can damage a motor

Is gas getting to the Cylinder? Ethanol Gas ruins carburetors. The Carb might be rusted inside

Engine valves need adjusting. symptoms: starts ok, runs until engine reaches max temp loses power then stops. can't restart when hot. once restarted runs for a while stops again. There is very little clerance in these valves and temperature alters the lenth by a few thou and the valve don't close fully losing compression, once cold the valves shrink back enough to create enough compression to start again.

Eric, the one thing I can think of is that either your linkages are incorrect, by that I mean it sounds as if then you throttle it up, it gets stuck open... I would go over the carburetor set up and make sure that everything is correctly back in its right order.. you may also have the governor set too high, adjust it lower if it sounds as though the engine is working too hard or screaming.

The wire going to the ignition coil.

Carb is not feeding gas to motor. Rebuild or replacement is mandated. If there is a switch on the gas line to the carb it has to be turned on.

How to adjust valves on most kawasaki tractor engines FC290 FC420

Have replaced the fuel filter, air filter? Either one can cause surging. Last resort if those dont fix it, rebuild the carb. Not hard but get the correct kit.

Any way you could try a filter that lets in more air? On some mowers, the long threaded bolt that holds the air filter on will actually go into the carb. Maybe it is too long?