Ariens 420cc Re-jetted? - Snowblower Forum : Snow Blower Forums
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post #1 of 22 Old 02-09-2018, 09:56 AM Thread Starter
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Ariens 420cc Re-jetted?

Has anybody with an ARIENS wirth the 420 Re-jetted the carb.?

Youyr input is appreciated!

2015 Ariens Hydro Pro 28" w/ B&S 420cc
w/(2) 10# weight kits and ArmorSkids

2012 Snapper SS822E 22" w/ B&S 205cc
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post #2 of 22 Old 02-09-2018, 01:58 PM
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Ive been trying to find info out myself
I found a high altitude jet today for the 414cc which could be used to drill out as a guinea pig
tried to find out today if the jets for the 414cc and the 420cc is the same no luck
my jet has a 113 on it have you had yours apart to look?

LCT Engine Part # 41450501 JET-HIGH ALTITUDE
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post #3 of 22 Old 02-09-2018, 02:22 PM
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Originally Posted by 1132le View Post
Ive been trying to find info out myself
I found a high altitude jet today for the 414cc which could be used to drill out as a guinea pig
tried to find out today if the jets for the 414cc and the 420cc is the same no luck
my jet has a 113 on it have you had yours apart to look?
LCT Engine Part # 41450501 JET-HIGH ALTITUDE
As you go up in altitude air becomes thinner and will make an engine run rich, a high altitude jet will lean the mixture out even more at sea level.
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post #4 of 22 Old 02-09-2018, 02:28 PM
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Originally Posted by DriverRider View Post
As you go up in altitude air becomes thinner and will make an engine run rich, a high altitude jet will lean the mixture out even more at sea level.
The jet can still be drilled out as a guinea pig to larger then the stock size non high altitude jet
I cant find the normal jet for sale just a complete carb for 50 to 80 bucks
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post #5 of 22 Old 02-09-2018, 02:35 PM
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Originally Posted by northframingham View Post
Has anybody with an ARIENS wirth the 420 Re-jetted the carb.?
Youyr input is appreciated!
I did when I first got my Simplicity with the B&S 420cc as it was running EPA mandated too lean which increases combustion temps and limits power output. I even took the drastic to some measure of increasing the idle mixture as I despise listening to a lean stumble from an engine.

Last edited by DriverRider; 02-09-2018 at 02:42 PM.
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post #6 of 22 Old 02-09-2018, 02:40 PM Thread Starter
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Originally Posted by 1132le View Post
Ive been trying to find info out myself
I found a high altitude jet today for the 414cc which could be used to drill out as a guinea pig
tried to find out today if the jets for the 414cc and the 420cc is the same no luck
my jet has a 113 on it have you had yours apart to look?

LCT Engine Part # 41450501 JET-HIGH ALTITUDE
I have not taken mine apart to look.

I am contemplating it.

Trying to learn more.

I have never taken a carburetor apart before.

2015 Ariens Hydro Pro 28" w/ B&S 420cc
w/(2) 10# weight kits and ArmorSkids

2012 Snapper SS822E 22" w/ B&S 205cc
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post #7 of 22 Old 02-09-2018, 02:54 PM
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Originally Posted by 1132le View Post
The jet can still be drilled out as a guinea pig to larger then the stock size non high altitude jet
I cant find the normal jet for sale just a complete carb for 50 to 80 bucks
No guinea pig needed as one can determine how lean an engine is running by manipulating the choke and listening to the exhaust (absence of lean popping) and the smoothing of engine operation.
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post #8 of 22 Old 02-09-2018, 03:02 PM
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I can almost assure you that your Briggs and Stratton 420cc engine is also jetted lean and will benefit from upping the jet.

I worked on a seasoned ariens pro28 with the Briggs 420 last year and needed to enlarge the jet to get rid of the full throttle hunting.

I don’t have a size, I used a jet ream and some rule of thumb to enlarge it.

With the engine fully warm, adding some choke is a great way to test mixture. When fully warm, adding choke should cause an audible disturbance and RPM drop. If the engine smooths out, then you need more fuel.

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post #9 of 22 Old 02-09-2018, 04:15 PM
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Originally Posted by DriverRider View Post
No guinea pig needed as one can determine how lean an engine is running by manipulating the choke and listening to the exhaust (absence of lean popping) and the smoothing of engine operation.
Mine does sound lean also you cant do what you said under a load
the guinea pig is to go as large as you cant without going to far then use the stock jet to go back one size
guinea pig sounds like being prudent to me
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post #10 of 22 Old 02-09-2018, 04:46 PM
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Mine does sound lean also you cant do what you said under a load
Accepted service practice is to not adjust under a load

Just like always in the days of past on carburetors that had adjustable main jets and with every manufacturer the screw gets set to a midway point of rich/lean without a load.
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