slight problem/popping - Snowblower Forum : Snow Blower Forums
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post #1 of 28 Old 02-18-2015, 02:37 PM Thread Starter
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slight problem/popping

i have an ariens 27" snowblower. model 921012 with a b&s 1150 series engine on it. i love this machine. but from day one, brand new in 2009, this engine has had a slight popping coming from the exhaust while the engine is running. it seems that the longer it runs, it pops a little more. at first, i thought it was a lean condition. click the choke closed a little, same problem. changed and gapped the spark plug. same thing. even readjusted the valves, same thing. now i'm thinking maybe a slightly weak valve spring. not really sure though. engine really runs great and the machine throws snow well. can anyone give me any other ideas. the engine is a briggs & stratton 15c134 0128 e8.
thanks for listening.
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post #2 of 28 Old 02-18-2015, 05:34 PM
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Pilot (low) jet may be partially clogged or undersized. That's about all I can think of that would cause it , but some others may know more than I for sure. It's one thing you can check though.

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post #3 of 28 Old 02-18-2015, 05:39 PM
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Originally Posted by Pathfinder13 View Post
Pilot (low) jet may be partially clogged or undersized. That's about all I can think of that would cause it , but some others may know more than I for sure. It's one thing you can check though.
Very likely, ethanol in the fuel is notorious for gumming up pilot jets.

1978 Ariens 924032 Teardrop repowered with a 1992 Tec 8 hp.
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post #4 of 28 Old 02-18-2015, 08:53 PM Thread Starter
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i am going to pull the carb and thoroughly clean it, but, i use 91 octane non-ethanol fuel. i'm really not suspecting the ethanol problem. also, i always drain the carb and fuel tank every year when in storage. i do this on all my equipment.
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post #5 of 28 Old 02-18-2015, 09:11 PM
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I am unfamiliar with that carb, but on mine (honda clone)you can pul the pilot jet without removing the whole carb very easily. You may be able to save yourself some work look into that first ;-)

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post #6 of 28 Old 02-19-2015, 09:25 AM
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Quote:
Originally Posted by AnteDarvo View Post
i have an ariens 27" snowblower. model 921012 with a b&s 1150 series engine on it. i love this machine. but from day one, brand new in 2009, this engine has had a slight popping coming from the exhaust while the engine is running. it seems that the longer it runs, it pops a little more. at first, i thought it was a lean condition. click the choke closed a little, same problem. changed and gapped the spark plug. same thing. even readjusted the valves, same thing. now i'm thinking maybe a slightly weak valve spring. not really sure though. engine really runs great and the machine throws snow well. can anyone give me any other ideas. the engine is a briggs & stratton 15c134 0128 e8.
thanks for listening.
Greetings! I have the same exact blower and engine. I notice on mine that if i throttle down from full power to idle, mine makes a single big POP. It's been doing it since day one (2009). If I go from full throttle to OFF, it doesn't POP.
I have always run regular unleaded (87). When running at FULL while I'm using it, it makes no POPs though.. It runs great. It's just when i throttle down to idle.

2010 Ariens Deluxe 27 (921012)
250cc B&S (1150 ft lbs)
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post #7 of 28 Old 02-19-2015, 10:43 AM
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Quote:
Originally Posted by AnteDarvo View Post
i have an ariens 27" snowblower. model 921012 with a b&s 1150 series engine on it. i love this machine. but from day one, brand new in 2009, this engine has had a slight popping coming from the exhaust while the engine is running. it seems that the longer it runs, it pops a little more. at first, i thought it was a lean condition. click the choke closed a little, same problem. changed and gapped the spark plug. same thing. even readjusted the valves, same thing. now i'm thinking maybe a slightly weak valve spring. not really sure though. engine really runs great and the machine throws snow well. can anyone give me any other ideas. the engine is a briggs & stratton 15c134 0128 e8.
thanks for listening.
Welcome to the forum AnteDarvo. As others have stated, it could be a lean fuel condition OR the valves are not adjusted correctly. Briggs states that the valves have to be adjusted with the piston 1/4" PAST top dead center. The procedure is near the bottom of this page. If you did it this way, disregard my suggestion and concentrate on the carb. I hope this helps.

Engine Valve Maintenance & Repair | Briggs FAQ

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post #8 of 28 Old 02-19-2015, 01:01 PM
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Originally Posted by Loco-diablo View Post
Greetings! I have the same exact blower and engine. I notice on mine that if i throttle down from full power to idle, mine makes a single big POP. It's been doing it since day one (2009). If I go from full throttle to OFF, it doesn't POP.
I have always run regular unleaded (87). When running at FULL while I'm using it, it makes no POPs though.. It runs great. It's just when i throttle down to idle.

Open up the idle jet a little. It's that way because of EPA standards they want it to run a little lean. You get rid of the pops and increase your performance slightly because even the idle jet fuel mixes with main jet fuel and you gain a slight bit on top end torque. Not sure how much you will notice if at all, but it will throttle up and down smoother and no pops, and possible idle smoother with a slight increase in pilot jet size. Clean that spark plug too make sure the gap it at the right amount.

That said, must be done carefully with micro drills in a pin vice, you just gingerly twist the jet into the drill one size at a time after you figure out where you are to start.

If you don't feel comfortable doing it, just leave it alone, a little pop won't hurt anything. It's just a little annoying when you know the cause and know how to fix it.

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post #9 of 28 Old 02-19-2015, 02:23 PM
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Garage
I picked one up on ebay. You can also buy bigger jets but having a couple machines I figured it was cheaper for me to get the drill bits.
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Make sure the windows are up before the snow plow goes by !!

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post #10 of 28 Old 02-19-2015, 04:37 PM Thread Starter
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mine pops too while shutting the engine down. i believe they call that after-pop.
if i bring the engine down to idle and run it there for 10-15 seconds and then just shut it off, no pop. idling it down for those few seconds before shutting down allows the engine to clear itself of excess fuel.
i do have precision drills and pin vises for carb work. i've done alot of drilling on rochester q-jet's. too bad we don't have our precious adjustments anymore.
fixed carb settings. what a joke. maybe i will try to open the jet slightly, listen to the engine and watch the spark plug.
i do miss our main metering and idle adjustments though.
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