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This comes from gas getting from the carb when the engine is stopped. The carb will need a good cleaning. Kawasaki has vent tubes just to avoid this when air venting gets plugged. Just saying. ..
you stated you replaced the filter.Was it the separator filter? the separator filter is located inside the separator tank. the separator tank is where you add oil. If this filter is bad it will cause oil and air to mix and get into the air. Also there is a 1/4 inch line that comes from the top of the tank . this line has an orffice in it If the orffice plugs oil can carry over into the air.
Is there a spark? If yes, then the fuel supply is blocked, either in the tank, hose, or carburetor. Enough fuel gets by to run a small load, but a bigger load starves it of fuel. The empty carb bowl makes it hard to start until enough fuel gets into the bowl. Clean the whole fuel system and all should be well. Try turning in all the carb adjustment screws then backing them off to their original positions, that may unclog something before you have to tear the thing down.
Use 40:1 fuel mix using modern synthetic saw oil and mix it in it's own can. Be sure to shake the can thoroughly just before refueling each time. Check with a home center, hardware store, or saw dealer for the correct plug--set the gap at 0.020". Check the manual dealers on the web for a manual. Hope this helps!
I had the same issue with a Husqvarna 150 BT blower. Brand new ran through 2 tanks of gas and need to buy more gas , mixed 50 to 1 ratio 87 octane on new gas which was the same as what i was running and it started pinging and running like **** then stalled and would not start. took the plug out and it was fouled. cleaned the plug got it running again but still not good. This model comes with a NGK CMS7H plug which i replaced with a champion RZ7C and new gas 93 octane and lawnboy oil mixed 50 to 1 ration and now its running like a champ. I've had bad experiences with NGK spark plugs in the past and thought this may resolve the issue and it did. Hope this is helpful to anyone out there having the same issues. Also used some fuel stabilizer in the fuel mix, I hear this helps with the ethanol problem in the fall/winter gas.
this is normal, do not worry that harmonic vibration type noise just tells me that the unit has a full freon charge and is running great, sit back and enjoy
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