toro 621e snowblower 163cc tecumseh carb needle valve - Snowblower Forum : Snow Blower Forums
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post #1 of 16 Old 01-29-2019, 06:43 PM Thread Starter
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toro 621e snowblower 163cc toro/loncin engine carb needle valve

There is a needle valve on the carb near the rear mounting plate of my toro snow blower. I have looked and looked and cannot find any information regarding this valve. Does anyone know what it is for and what it should be adjusted to. The carb part number is 119-1996

Thanks

Last edited by rjk8619; 01-31-2019 at 01:09 PM. Reason: edit title correction
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post #2 of 16 Old 01-31-2019, 09:31 AM Thread Starter
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Aww come on, some smart person on this forum must know what this adjustment is for ????
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post #3 of 16 Old 01-31-2019, 09:51 AM
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I have never seen one before. Possibly a mixture adjustment. Also, that is not a Tecumseh engine, or a Tecumseh carb. That engine is advertised as a genuine Toro engine, though it is actually made by Loincin.

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post #4 of 16 Old 01-31-2019, 10:19 AM
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Yeah, looks like an idle mixture adjustment screw, but the newer machines usually do not have these, the mixtures are pre-set. On the older carbs, that mixture screw base setting was 1 turn out from all the way in (gently).

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post #5 of 16 Old 01-31-2019, 12:57 PM Thread Starter
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Thanks for the thoughts, I have corrected the tread title to reflect a toro/loncin engine. Thanks again for the correct info.


Still would like an answer from someone that knows for sure what this adjustment controls .


Thank You

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post #6 of 16 Old 01-31-2019, 01:50 PM
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There are actually two adjustments in your photo. The top looks like idle speed, and assuming that the flange to the left is the engine side of the carb, that looks like idle mix, but in a relatively odd place. To know for sure, screw it in gently and count the number of turns until it bottoms, so that you can get it back where it is, and then see what effect it has on both idle and full throttle operation.



I'm still betting on idle, since a downstream port behind the throttle plate is often used, since the main jet needs to feed fuel at the narrow portion of the venturi, which certainly isn't there. Then again, hard to tell what internal passages might be in that, but looks like the tip of the needle may well just regulate a port that goes directly into the carburetor bore.



I feel like I've seem something like this once, but can't for the life of me recall on what . . .


Were you to provide the model mumber of the blower and serial number/year, that would help a lot. "621e" refers to a lot of Toro models, and it's not really possible to narrow it down based on just that. With the blower model, the main doc/parts list can be found, and Toro tends to list a lot of engine parts/info there as well . . .
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post #7 of 16 Old 01-31-2019, 02:06 PM
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Have you gone to Toro.com and looked at the owner's and service manual?

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post #8 of 16 Old 01-31-2019, 02:54 PM Thread Starter
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Thanks for all your help.

Yes, the upper adjustment is an idle adjuster.
The one I have inquired about is the lower one in the picture adjacent to the engine side mounting plate.

Based on Lawntoro comments, I have determined that the engine is Chinese either a loncin or a Lifan.
I have found a diagram of this carb in some lifan manual and they call this needle valve a " Mixture Adjustment Screw"

I assume that it is an air mixture adjustment. And your are correct that the needle regulates a port that goes directly into the carburetor bore. see picture. I have removed the needle completely and cannot tell if there are any internal passages that connect to the needle bore. If this is in fact air mixture then turning in should rich the mixture and turning out should lean the mixture ? Right ?
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post #9 of 16 Old 01-31-2019, 03:29 PM Thread Starter
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I have gone to Toro.com and looked in both the owners and service manuals.
You kind of see the needle valve in question in the exploded view of the carb but it is not referenced either in the parts list or in the text.
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post #10 of 16 Old 01-31-2019, 03:40 PM
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Quote:
Originally Posted by rjk8619 View Post
The one I have inquired about is the lower one in the picture adjacent to the engine side mounting plate.

I have found a diagram of this carb in some lifan manual and they call this needle valve a " Mixture Adjustment Screw"

I assume that it is an air mixture adjustment. And your are correct that the needle regulates a port that goes directly into the carburetor bore. see picture. I have removed the needle completely and cannot tell if there are any internal passages that connect to the needle bore. If this is in fact air mixture then turning in should rich the mixture and turning out should lean the mixture ? Right ?
Low mixture, turning it in makes it lean, turning it out makes it richer. You generally want to start 1-1 1/2 turns out, then while running, turn it in until it runs a little crappy then turn it out 1/2 turn. You can also turn in until crappy then turn out until crappy and find the mid point, I do this first then follow my initial recommendation.

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale
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