Toro 621 qzr 2014 model surges - Snowblower Forum : Snow Blower Forums
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post #1 of 13 Old 01-11-2018, 10:48 PM Thread Starter
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Toro 621 qzr 2014 model surges

I bought two toro 621 qzrs new at the same time I think 2014 models. One gets more abuse than the other. This year the one that gets more abuse seems to be surging when no choke is on but it can kinda clean up with half choke.Also its not major major surging but enough to know something is off and not running smooth. I took the whole carb apart except the choke pieces and the throttle flap pieces. Everything was pretty clean. Nothing major but I still used a wire and carb cleaner on every area I could. I 'm going to change the spark plug but I don't think that is the problem. I don't know what happened this year. any ideas?
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post #2 of 13 Old 01-11-2018, 11:01 PM
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Their are tiny passages that are probably still plugged up. I use an ultrasonic cleaner, to clean carbs. But the carbs may be cheap enough to just replace. Check ebay.




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post #3 of 13 Old 01-12-2018, 12:38 AM
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post #4 of 13 Old 01-12-2018, 01:24 AM Thread Starter
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I don't think i removed or unscrewed anything from the top. The only thing I recalled from the top were two mechs for the choke and whatever you called the throttle.
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post #5 of 13 Old 01-12-2018, 01:43 AM
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post #6 of 13 Old 01-12-2018, 07:19 AM
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Quote:
Originally Posted by jtclays View Post
If you use the "mouse over" zoom on the pic in this ad you can see the throttle stop/idle screw. Under it is a black "plug". Mark, measure or count the turns to remove the throttle stop screw completely, take a small flat blade and ease the plug out of the carb body. It is the pilot jet. It'll have a fairly large hole crosswise through it's body with a very tiny little hole in the end of the body. Use one strand of a wire wheel/brush to clear it and a little carb spray. If you already cleaned the main jet and emulsion tube previously and still have a little funky running, this will usually clear it up.
https://www.jthomasparts.com/520-872...yABEgKJk_D_BwE
i have a 621e that was doing the same thing i tried cleaning the carb removed all jets ect. it was still surging. so a $13 carb from ebay is on the way.
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post #7 of 13 Old 01-12-2018, 11:26 AM
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Would a guy want to try a cleaner like Star Tron. It worked on my old MTD when it started running rough one winter. Now I add little every time I fill the tank.




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post #8 of 13 Old 01-13-2018, 08:49 AM Thread Starter
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I will try cleaning that and see what happens. Getting a new carb is an option but aftermarket vs oem????? I also use Marine(blue color) sta-bil fuel treatment with plus or premium fuel.
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post #9 of 13 Old 01-13-2018, 11:31 AM
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Found 2 problems with my 621 second hand machine. While draining the gas I noticed it was draining slow.

I found i little screw in the tank partially obstructing the exit. I got it out and with the old carb was still surging a bit but was better.

Put the new eBay carb on and it runs like a dream now just used it in 6-8 inches.

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post #10 of 13 Old 01-26-2018, 10:14 PM Thread Starter
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I have mine set aside for the moment working on my other large ariens. It's running better but not perfect .
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