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Engine surges (If carburetor needs adjusting, how to)

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There is a flat head screw with a spring on it if you turn it in it will reduce the amount of gas flowing in if you back it out it will let more gas in there is also a screw that is attached to the bottom of the bowl on some models and that is the adjustment screw .the screw should be on the side facing towards you if you remove the screw all the way out it should have a small taperd point on the end the spring keeps pressure on the screw to prevent the screw from backing out so dont back out. let me know if you need more help i have also posted some other detailed ifo on other lawn engine carb repair might be more helpfull info

Posted on May 27, 2011

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Posted on Jan 02, 2017

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How do correct RPM surge on a LH 195 Tecumseh engine


Hi you're governor gears inside the motor could b the problem ...good luck

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Why does my Ryobi 2200 watt generator surge at low RPM's


The engine is not getting enough fuel. Try choking it some and see if this helps. If it does, then check the fuel filters. If you still have problems, then you will need to clean the carburetor or open the main jet if it is adjustable. Modern small engines are se to run as lean as possible to keep pollution down. This is much worse on small engines shipped to California. If the carburetor and filter are clean and you still have the problem, take the carburetor to lawn mower shop and see if they will replace the main jet with one a little larger.

Let me know if this gets you going. Robert

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Why does my honda gc160 engine surge continuously?


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John Deere L111 from 2004 surges in idle. Have replaced plugs, fuel/oil filters, fuel pump. Still does it.


Cleaning the carburetor is a good starting point. There is two versions the Briggs that were used on this mower. One had a single barrel and the other had a two barrel version. Both were Nikki carburetor that main jets that are held in place by tiny o-ring that shrink causing the jets to leak extra fuel causing surging.

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Engine surges at idle only,if I put emergency brake and it ok but if I tap again it surges


Surging is caused by fuel starvation to the engine. You can look and see if there is a main jet adjustment screw on the carburetor and turn it in and out to adjust the air/fuel mixture.

Nov 05, 2013 | Garden

1 Answer

My Honda 13.5hp engine has started surging. It seemed to occur after the air filter fell off during mowing for a few seconds. I have tried cleaning the carburator but it still surges. Anything else I can...


Hi sndlys,
When the engine surges (we call it hunting) like that it usually means, the carburetor or the governor need adjustment. You have cleaned the carb. but did you clean or replace the air filter, and did you try to adjust the carb? Since it was running good before I doubt it is the governor. Try to adjust the high speed mixture screw by 1/8 turn at a time and waiting a few seconds to let that adjustment work it's way in the carb. Start by turning the screw out (counterclockwise) a few times. If nothing happens or gets worse turn the screw in (clockwise) a few times, but do not go less than 1 turn out from a lightly seated position. (turned clockwise until lightly seated so no damage is done to the seat or the needle screw) to prevent running in too lean a mixture to prevent overheating and possible engine damage. You could try the low (idle) speed mixture screw adjust a bit, but make sure you remember the position you started from whenever you any adjustment at all. I think if the carburetor is clean and the air filter is clean, also that there is a good fuel flow to the carb. you should be OK. I hope this helps out a bit.Get back to me if you need help. All the best and good luck. Denis.

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2 Answers

Engine speed surges


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.

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Silver series 6.5 hp surging


  1. Carburetor is dirty.
  2. Air leak in carburetor or intake manifold (e.g., bad O-ring, gasket, primer).
  3. Carburetor is improperly adjusted
These are some of the more typical reasons that can cause a small engine to surge.

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Engine run rough at idler and surges


I would change the fuel filter and see if that don't help. You might give it a good tune up and adjust the timing. ( If it has a carburetor then adjust the carb too.

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