Kawasaki mower engine

if there is no problem , the engine will start at full throttle
mixture screws are for idle and low engine rpm
the problem is
have the carbs professionally overhauled

You've got spark to get it to fire, but not enough air or fuel to keep it running. When you are starting the engine, your carburetor makes the fuel mixture richer, by reducing the amount of air in comparison to the amount of fuel it's sending to the engine (that's the "choke"). Then, when it's running the motor's vacuum rebalances the mixture to normal and that's when you conk out. Chances are it's a fuel delivery issue, without that choke the mixture goes too lean (not enough fuel).

You've probably been running standard gas with 10% ethanol. I have found that on older ATV's (like my 98 Honda), especially if the ATV sits for a month or two unused, ports in the carb clog with the residue from ethanol and it needs to be cleaned.

Unfortunately, you can't just spray something in the intake of the carb, you have to remove it and spray the cleaner into numerous ports in the carb and preferably blow them out with compressed air. If you're mechanically inclined, it's pretty easy, and costs almost nothing. However, ethanol also attacks rubber parts used in earlier carbs, possibly like yours, and that can mean replacing a couple parts, but rarely anything expensive.

Alot of the newer carburetors are coming from the manufacturer with no adjustment screws. They are preset

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May be the carb needs a rebuild kit....or may be a stuck float or something of that nature...if the mower runs with the filter off then that could indicate a fuel mixture setting is set too rich...with the filter on..the engine would have more suction causing more fuel to be consumed ...thereby choking the engine out...if you know where the fuel mixture screw is, then try this...first turn the screw in all the way until it stops(be gentle, as the needle will be damaged if too much force is used). then turn the screw out 1 & 1/2 turns...this will be a good starting point for setting the carb...while the engine is running(with the filter on) slowly turn the screw ccw until the engine starts to die then turn it cw in till it starts to die...find the "happy medium" and this should solve the problem(assuming the carb does not have to be rebuilt

On top of carb you will see a jet that is slotted,remove with screw driver and use a very thin wire to clean out hole in jet.Some had a black metal clamp holding it in place,remove that one by removing phillips screw,black clamp then use small pliers to pull jet out of top side of carb.If this does not work remove carb bowl and jetting in bottom-center of carb and clean jetting holes with a small copper wire.The mixture screw is for low speed air/fuel mix,this engine does not have a high speed fuel screw.Fixed jet.

Surging engines in lawn mowers are usually related to a lean fuel/air mixture. With today's environmental concerns, the carburetors on these engines are set with a very lean mixture (to reduce air pollution). Furthermore, they usually put limiter caps on the carburetors where you cannot easily adjust the mix to get the engine to run better.

If there are adjustment screws on the carburetor, try turning the high speed adjustment screw a bit counter-clockwise (if the limiter cap will allow it). This will enrich the fuel/air mix a bit and might help the engine run a bit better.

ok buddy your not getting enough fuel in the carb so on the carb will be a screw you need to turn this mixture screw out a turn and try it if this doesnt work get back to me buddy

fuel not getting in the cylinder this could either be the float or mixture screw on the carb is a screw the air mixture screw turn this out 1 whole turn or just fiddle with it until it runs if not buddy get back to me

hi mate on the carb you will find 2 screw 1 is for the idle and the over is for mixture the idle one will be the furthest out screw it in 1/4of a turns will the engine is running this will take the idle up on the engine and the backfiring is fuel in the exhaust not being burnt so on the over screw on the carb screw that in 1/4 of turns this will decrease the amount of fuel going into the engine if it still backfires screw it in 1/4 of turns again and see what difference it makes good luck

Hi Stephen,
Its simple , just remove the air filter clean it and check the spark plug and reset it to its right specs the gap.
Locate the air-mixture screw on the carb and warmup thebike's engine.
Turn the air-mixture screw in tothe last , but very slowly as to not damage it as its very sharp at the end of it, at this point increase the idling a little thn turn the air-mixture screw outwards 1 and a half turns and you will notice the difference in the engine , it may rev a little higher and be stable , here you will have to reduce the idling speed and again try to readjust the air-mixture screw outwards a little or inwards alittle depends how the engine responds.
Hope this will help!

Knight.(Yamaha Seca XJ750A 1981)