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Dreaded John Deere SURGING

#1

J

jjccamis

I have read EVERY thread on this forum and preformed ALL the suggestions to solve the surging problem on my JD LA120. Nothing , to this point has stopped the surging, low idle only. Other than the annoying sound it makes, is there any reason I can't run the mower? Runs great at anything above 1/4 throttle. The only part I haven't replaced is the float needle. Could this possibly be the problem? I've had the carb. apart three times. Total frustration! Somebody please send me the magic trick that will fix this issue.


#2

Boobala

Boobala

jjccamis said:
I have read EVERY thread on this forum and preformed ALL the suggestions to solve the surging problem on my JD LA120. Nothing , to this point has stopped the surging, low idle only. Other than the annoying sound it makes, is there any reason I can't run the mower? Runs great at anything above 1/4 throttle. The only part I haven't replaced is the float needle. Could this possibly be the problem? I've had the carb. apart three times. Total frustration! Somebody please send me the magic trick that will fix this issue.
Click to expand...

JD LA120 is your Mower Model, tells us NOTHING about your engine .. see example ......

GET INFO.JPG .. click to enlarge


#3

J

jjccamis

Briggs and Stratton Model 441677, Type 0113E1, 21 HP, OVH Twin, Nikki Carb.


#4

BlazNT

BlazNT

You should never run your engine at 1/4 throttle anyway. Run it wide open like it is supposed to be and have fun mowing.


#5

J

jjccamis

I agree that when mowing, the mower should be run at full throttle. When idling before cutting begins is when the surging occurs.


#6

S

shiftsuper175607

jjccamis said:
I agree that when mowing, the mower should be run at full throttle. When idling before cutting begins is when the surging occurs.
Click to expand...

What are you doing sitting around on an idling lawn mower?

If you temporarily push on the choke will it stop the surging?


#7

B

bertsmobile1

jjccamis said:
I agree that when mowing, the mower should be run at full throttle. When idling before cutting begins is when the surging occurs.
Click to expand...

Mowers have not been idled down before shut off for decades it actually increases the heat in the engine.
If it only surges at idle then the idle fuel circuit in the carb is still blocked.
They can be a bugger to clean and some times they can not.
There is more to cleaning a carb than just a quick squirt of goo.
And yes, mow away.
With a blocked idle circuit the carb will be running a little lean but not enough to worry about


#8

J

jjccamis

shiftsuper175607 said:
What are you doing sitting around on an idling lawn mower?

If you temporarily push on the choke will it stop the surging?
Click to expand...

Yes, a bit of choke stops the surging.


#9

J

jjccamis

bertsmobile1 said:
Mowers have not been idled down before shut off for decades it actually increases the heat in the engine.
If it only surges at idle then the idle fuel circuit in the carb is still blocked.
They can be a bugger to clean and some times they can not.
There is more to cleaning a carb than just a quick squirt of goo.
And yes, mow away.
With a blocked idle circuit the carb will be running a little lean but not enough to worry about
Click to expand...

Thanks, just the answer I am looking for.


#10

BlazNT

BlazNT

jjccamis said:
I agree that when mowing, the mower should be run at full throttle. When idling before cutting begins is when the surging occurs.
Click to expand...

Like I said, a lawn mower engine should never be run at 1/4 throttle.


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