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post #1 of 16 (permalink) Old 06-17-2017, 06:29 PM Thread Starter
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surging engine

the B&S is new to me and I don't know anything about it.


I thought it was a dirty carb but its still surging after cleaning the carb out really good and making sure all passages are clear. I have cleaned many carbs in my lifetime and know to check all the passages and its all clean.


so at this point I am not sure what it is causing it, I guess might be valves need adjusting or the timing or something. im not good at diagnosing things like that on these small engines.


what are you thoughts on this?


it starts easy and runs great just with a steady surging pulse and the occassional muffled pup (but not really a pop) from the exhaust as though it almost wants to backfire.


I failed to get the numbers off the carb when I had it out so im not 100% sure its the right carb, it looks like someone bought a new carb for it recently

Last edited by keakar; 06-17-2017 at 08:21 PM.
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post #2 of 16 (permalink) Old 06-17-2017, 06:41 PM
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Is this a lawn mower?

Last edited by Tom Burns; 06-17-2017 at 06:58 PM. Reason: Incorrect statement.
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post #3 of 16 (permalink) Old 06-17-2017, 08:19 PM Thread Starter
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Is this a lawn mower?
yes its a commercial B&S 11.0hp C/I engine
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post #4 of 16 (permalink) Old 06-17-2017, 09:08 PM
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How does it act on slight choke?


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post #5 of 16 (permalink) Old 06-17-2017, 09:25 PM Thread Starter
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How does it act on slight choke?
it starts really easy with half a pull on the rope (it has no battery hooked up electrical start wires not connected)


it acts the same no matter how much or how little throttle you give it and once its warmed up and running, it wants to die if you give it choke.


it also acts the same with or without the blades engaged, if the mower is in motion or not, and if its in gear or not.


its just a slow methodical surging of the throttle but not what I would call a rapid surge
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post #6 of 16 (permalink) Old 06-18-2017, 10:03 AM
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I'm a rookie, so take this with a grain of salt, but I happened to watch this video right before reading your post. It could be the problem, at least something to check off the list.

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post #7 of 16 (permalink) Old 06-18-2017, 11:14 AM Thread Starter
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I'm a rookie, so take this with a grain of salt, but I happened to watch this video right before reading your post. It could be the problem, at least something to check off the list.
lol, I watched a few of taryl's videos before, he cracks me up.


i'll check it, but I don't think this has anything to do with surging
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post #8 of 16 (permalink) Old 06-18-2017, 11:16 AM Thread Starter
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got a guy coming look to buy the lawn mower with that surging engine on it today, im selling it as-is, so if he doesn't buy it, then i'll just buy a new carb for it, if he buys it, its his problem and not mine any more.


im pretty sure I got the carb cleaned out really good, but it is possible there is still an internal fuel restriction in it somewhere, I don't see what else it could be causing it to surge like that. everything I learned about surging says its a fuel restriction. in a youtube video, one guy (i think it was taryl) even said he drills the main jet out one size bigger to fix surging issues. but im not sure about how great an idea is to do all that, if if ran good at one time why would you ever need to drill the jet bigger?

Last edited by keakar; 06-18-2017 at 11:24 AM.
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post #9 of 16 (permalink) Old 06-18-2017, 11:48 AM
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lol, I watched a few of taryl's videos before, he cracks me up.


i'll check it, but I don't think this has anything to do with surging


Fast forward to about 2/3 of the way through. He talks about how the governor not making contact can cause surging, and what to do about it.


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post #10 of 16 (permalink) Old 06-18-2017, 12:08 PM Thread Starter
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Fast forward to about 2/3 of the way through. He talks about how the governor not making contact can cause surging, and what to do about it.


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ok, thanks


actually it was all the way at the end of the video.


I had stopped watching the first time right after he was bending the spring because he was never talking about surging


I had hope that that is all it needed to fix it so I ran out and tried redoing the governor linkage but it wasnt out of adjustment at all so that didn't fix it


but at least I learned how to properly adjust the governor, so im learning stuff even if im not solving the problem yet lol

Last edited by keakar; 06-18-2017 at 12:57 PM.
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