Surging that will not go away

slomo said:
You have a timed running issue. Check the fuel tank. Should flow like a new one with zero trash in the bottom and in the outlet nipple. Flow test it with some Diesel into a glass jar. Not as flammable as gasoline.

Long shot is a failing ignition coil but 5-6 hours later??? Wouldn't your gas tank/s be dry by then?
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Ignition coils - that is longshot considering the plugs actually look good indicating good combustion. The engine is running clean with a lean surge. I am getting to the opinion of too much air instead of not enough gas.

As to fuel spouts, I don't use them. I pour gas direct from the container thru a filtered funnel.
 
Spray some WD-40 around the base of your carburetor and intake. You will be doing this with the engine running. Do you notice any change?
A malfunctioning governor is another possibility.
 
MParr said:
Spray some WD-40 around the base of your carburetor and intake. You will be doing this with the engine running. Do you notice any change?
A malfunctioning governor is another possibility.
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If the engine is hunting and surging, the VAST majority of time it indicates a lean fuel issue. This is caused by an intake leak (seldom), or a fuel/air mixture that is not correct (often). Dirty carburetor is usually the problem. If carburetor is clean, then drilling out the pilot jet or another carburetor is the only solution. Believe me, I get several a year that hunt and surge after cleaning carburetor and it drives me crazy. Got one now that I will work on today.
 
Well, as I suspected, it turned out to be the carb. I'm guessing the first replacement was sub-standard quality or just not adequate somehow. Of course, that one ran 5-6 hours, so time will tell if this is permanent. One bit of advice I would give: don't buy a kit with a bunch of add-ons. You are paying for them in the quality of the carb itself. Besides, half the time they are the wrong part or don't work. In my case the spark plugs were the wrong thread width and the fuel pump did not work at all.

Thanks all for your replies.

JK.
 
End_of_Rope said:
Well, as I suspected, it turned out to be the carb. I'm guessing the first replacement was sub-standard quality or just not adequate somehow. Of course, that one ran 5-6 hours, so time will tell if this is permanent. One bit of advice I would give: don't buy a kit with a bunch of add-ons. You are paying for them in the quality of the carb itself. Besides, half the time they are the wrong part or don't work. In my case the spark plugs were the wrong thread width and the fuel pump did not work at all.

Thanks all for your replies.

JK.
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Because of how competitive the aftermarket carburetor market is, I believe the add ons are to try to outdo the next guy. When the prices are close, but the add ons are a bit different, it is pretty much the same carburetor. Sometimes you just get a better one than the next. Overall, I have experienced really good results with aftermarket carburetors for four stroke equipment.
 
I had a similar surging issue and was at witt’s end solving it. Initially cleaned the carb and didn’t help. Bought a new OE carb and seemed to help then started surging again. Wile taking off the new carb to see what the hell was going on, I noticed that the plastic intake face where it mounts to carb was warped. Replaced the intake manifold and problem solved…..a real brain teaser.
 
End_of_Rope said:
Ignition coils - that is longshot considering the plugs actually look good indicating good combustion. The engine is running clean with a lean surge. I am getting to the opinion of too much air instead of not enough gas.

As to fuel spouts, I don't use them. I pour gas direct from the container thru a filtered funnel.
Click to expand...
Failing coils won't consistently surge.
 
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