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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Briggs & Stratton model 23 spark advance


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Old 12-31-2014, 11:48:38 PM
54hawken 54hawken is offline
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Smile Briggs & Stratton model 23 spark advance

Concerning cam gear, spring and weight. need someone to explain in detail how it works. What the weight activates etc.
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Old 01-02-2015, 03:46:49 PM
Andrew Mackey Andrew Mackey is offline
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Default Re: Briggs & Stratton model 23 spark advance

There is no spark advance on the 23. The weight works to slightly open the exhaust valve on the compression stroke, making it easier to start the engine. As speed increases, the valve de-compression lift decreases, giving full action of the exhaust valve. If the return spring breaks or is missing, valve action will be erratic.
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Old 01-11-2015, 11:45:22 PM
54hawken 54hawken is offline
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Default Re: Briggs & Stratton model 23 spark advance

I found an old briggs & stratton repairmans manual. It showed, and said:
The shaft that comes through the engine block into the external points/condenser box and hooks to the points, has an integral shoe on the opposite end that is moved by the camgear weight. When the engine is started (low rpms) the weight is held in by a spring. As the rpm are increased the centrifical force overcomes the spring and moves the weight outward, pushing the shoe, which rotates the shaft slightly to advance the timing. when rpms decrease the spring retracts the weight to retard timing. This feature makes for easy starting for a 9hp. No kickbacks & sprained fingers. Also no backfiring thru carb when accelerating.

---------- Post added at 10:39 PM ---------- Previous post was at 10:36 PM ----------

I neglected to say my above 2 posts are for Briggs model 23 with Magnematic ignition system

---------- Post added at 10:45 PM ---------- Previous post was at 10:39 PM ----------

Quote:
Originally Posted by 54hawken View Post
I found an old briggs & stratton repairmans manual. It showed,
The shaft that comes through the engine block into the external points/condenser box and hooks to the points, has an integral shoe on the opposite end that is moved by the camgear weight. When the engine is started (low rpms) the weight is held in by a spring. As the rpm are increased the centrifical force overcomes the spring and moves the weight outward, pushing the shoe, which rotates the shaft slightly to advance the timing. when rpms decrease the spring retracts the weight to retard timing. This feature makes for easy starting for a 9hp. No kickbacks & sprained fingers. Also no backfiring thru carb when accelerating.

---------- Post added at 10:39 PM ---------- Previous post was at 10:36 PM ----------

I neglected to say my above 2 posts are for Briggs model 23 with Magnematic ignition system
sorry for edit
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