What does this screw do? - Snowblower Forum : Snow Blower Forums
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post #1 of 16 Old 10-18-2014, 12:21 PM Thread Starter
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What does this screw do?

It's on a Tecumseh 5 H.P. Snow King on the Husqvarna I just got. It's the screw just above the bowl, to the right.
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Joe

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post #2 of 16 Old 10-18-2014, 12:47 PM
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Two things come to mind: 1. It's the screw that adjusts the idle. Not the idle mixture screw, but the screw that limits how far the throttle cable will travel. Or 2. It's an air flow mixture screw.

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post #3 of 16 Old 10-18-2014, 12:54 PM
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tow things come to mind
lefty loosey
righty tighty

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post #4 of 16 Old 10-18-2014, 01:05 PM Thread Starter
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I can't seem to find anything from 65ford or doneyboy73. I don't want to mess with it without knowing what it does.

Joe

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Toro 724
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Toro 5/21 sold
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Ariens Sno Tek 7/24 sold.
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post #5 of 16 Old 10-18-2014, 01:12 PM
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Idle stop. If you look at where it goes through on the other side it makes contact with the throttle butterfly when its at idle.
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post #6 of 16 Old 10-18-2014, 01:22 PM Thread Starter
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I'm referring to the black screw just above the bowl, going into the carb body. Just off to the right. The red screw is the idle stop.

Joe

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New.green shovel
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post #7 of 16 Old 10-18-2014, 01:27 PM
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I believe that is the idle air mix screw. If you take it all the way out the back end should be a needle. It takes the place of the main jet needle on those non adjustable carbs, where the bowl nut doesn't have a needle on the back end like older carbs. Most of those I have come across have a black plastic cap over that screw your referring to because they are "non adjustable".
If you want to pull it, count how many turns it takes to tighten it all the way, then you'll know you spot when you reinstall it. Tighten all the way, then back out the appropriate amount.

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Last edited by Ray 1962 10ML60; 10-18-2014 at 01:39 PM.
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post #8 of 16 Old 10-18-2014, 01:28 PM
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Garage
Question

[QUOTE=dbert;272145]Idle stop. If you look at where it goes through on the other side it makes contact with the throttle butterfly when its at idle.[/QUOTE

The red arrow, isn't this the idle restrictor screw?

Click me,
What does this screw do?-img_20141018_105830.jpg

I think he may be asking about the yellow arrow screw?

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***********************
Craftsman #536886141(Around 2000?)
5 Horse, Tecumseh HSSK50-67392S
22" Dual Stage
***********************
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Last edited by Big Ed; 10-18-2014 at 01:36 PM.
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post #9 of 16 Old 10-18-2014, 01:31 PM
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Hello Joe, that is a non adjustable idle mixture screw. Use a pick to remove the plastic cover and the jet is removable for cleaning. A dirty idle restrictor on these emission carbs are the main cause of the engine surging.

Disassembly, Cleaning and Repair of Tecumseh Series 1 Emission Carb 640084B

After cleaning the jet, it gets screwed in snuggly, it is not an adjustment screw. Then pop the plastic cover back on.

The nipple with the yellow arrow is for the primer hose.

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Last edited by Grunt; 10-18-2014 at 01:35 PM. Reason: Add Info
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post #10 of 16 Old 10-18-2014, 01:33 PM
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Thats the nipple for the primer bulb hose.
The only screw in the picture is the low (idle) speed adjust.
example
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