Toro 726 OE backfiring - Snowblower Forum : Snow Blower Forums
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post #1 of 14 Old 01-07-2018, 09:41 PM Thread Starter
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Toro 726 OE backfiring

Hey everyone,

So I bought a used 2012 model 726 OE in pretty good shape (pics to come!), and when I disengage the auger, the engine has a tendency to backfire. It also happens when I shut off the snowblower - there's a final pop. Is this normal? I don't think it is, and if that's the case, what could it be?

Thanks in advance!
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post #2 of 14 Old 01-07-2018, 09:58 PM
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usually means running lean, more air than fuel. when ur about to lower throttle put choke on the first indent and see what happens . clean the carb and/or use seafoam or similar

Bought a dead but now fixed 1980ish craftsman II 10/28....ITS ONE HEAVY BEAST

MY VIDS ON FIXIN HER UP

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post #3 of 14 Old 01-07-2018, 11:00 PM Thread Starter
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Thanks for the advice. I will check it out tomorrow as we have some fresh snow falling!
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post #4 of 14 Old 01-07-2018, 11:07 PM Thread Starter
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Briggs lists the following as possible causes:
  1. Lowering engine speed too fast
  2. Gasoline, which contains higher blends of alcohol
  3. Carburetor adjustment set too lean
  4. Muffler construction can induce backfire
  5. Higher than normal engine temperatures

Number 1 isn't the case, because it happens without load.
Could be the type of gas. As I just got it, the PO might have used some funky gas.
Number 3 is a definite possibility.
Number 4 and 5 would surprise me.

Does anyone know the carb setting for this snowblower?
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post #5 of 14 Old 01-08-2018, 05:25 AM
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there is probably no adjustment on the carb, the jets are fixed. if you can take it apart and clean it or at least try something like seafom to clean the carb

current machines
1-toro2450E-38419. 1-toro3000E-38435. 1-toro 3650E-38445
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post #6 of 14 Old 01-08-2018, 05:51 AM
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my kohlers all do the same with stock settings, summer or winter, my personal fix has been to slowly lower the throttle down to idle than shut it down, seems to stop the lean backfire issue.
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post #7 of 14 Old 01-09-2018, 10:50 PM Thread Starter
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So I ran it again tonight to see what the effects were, and sure enough the backfiring occurred, even with some load. The top rear of the muffler started to get a little red (is the common? I've only run it during the day, this was my first time running it at night). As for the Sea Foam, I've used it with cars but never a snowblower. Is the principle the same? Fill the tank with it?

Vinny, I forgot to check using the first indent of the choke. Good thing there is more snow in the forecast!

What would the danger be of running it lean? Burning a hole in the piston?
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post #8 of 14 Old 01-13-2018, 01:36 PM Thread Starter
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When I put it on the first indent of the choke, there is a small reduction in the backfiring. On the second even more so. Lean would seem to be the issue. I'm gonna SeaFoam it today and see. Thanks.
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post #9 of 14 Old 01-13-2018, 01:49 PM
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Quote:
Originally Posted by Versys514 View Post
When I put it on the first indent of the choke, there is a small reduction in the backfiring. On the second even more so. Lean would seem to be the issue. I'm gonna SeaFoam it today and see. Thanks.
well u have a fuel issue, not enough getting mixed in w/air, or too much air getting into the intake pipe(between butterfly and engine intake hole).
u can spray carb cleaner on intake pipe gaskets, one right after the butterfly and the other where it connects to motor, if rpms change then u have an air intake leak at the gaskets.

but most likely carb needs a good cleaning and doubt that seafoam would resolve it, but doesnt hurt to try.

as for running it lean, not a great idea for long run time, but closing choke down a little should be ok for a quick snow removal job

Bought a dead but now fixed 1980ish craftsman II 10/28....ITS ONE HEAVY BEAST

MY VIDS ON FIXIN HER UP

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Last edited by vinnycom; 01-13-2018 at 01:52 PM.
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post #10 of 14 Old 01-13-2018, 02:22 PM
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You should check your valves for correct clearance also.

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