Re: throttle linkage Briggs & Stratton - Saab General Bulletin Board - Saabnet.com
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Re: throttle linkage Briggs & Stratton
Posted by Eric Law [Email] (more from Eric Law) on Mon, 20 Oct 2008 17:46:41
In Reply to: throttle linkage Briggs & Stratton, 91Aero.jr, Mon, 20 Oct 2008 14:04:59
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Is it possible the spring has fallen off? What is the symptom with the engine? It sounds like you have the basics already.
Assuming this is a vertical-shaft lawnmower engine, here's how it's supposed to work. The flap inside the engine cowl is on a pivot, and sticking out the side opposite the flap is a little arm. There should be a metal wire linkage connecting that arm to the throttle on the carburetor. Typically the wire linkage will also have a small loop in it. A spring goes from that loop to the stamped metal thing you referred to, that's controlled by the throttle lever.
When the throttle is set to "fast", the stamped bit will move so as to put more tension on the spring. This tension pulls the throttle plate (which as mentioned above is also linked to the flap inside the cowling) open. As the engine speeds up, airflow from the fan pushes against the flap, pushing the throttle toward the closed position. The balance of spring tension and airflow pressure on the flap is what controls the engine speed: more spring tension = more airflow needed to close the throttle = higher speed.
If you look it over and decide the spring has disappeared, you probably should write down the engine model, go to a small-engine place, and order the correct spring. If the spring's wrong all sorts of problems can happen, and the spring is much lower tension than your average spring you might find at a hardware store.
Eric Law
posted by 72.93.22...
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