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decompression feature

E

ed will

Well-known Member
Hi, is the decompression feature on the bigger
Briggs engines hooked to choke or how do they
work? I have 2 - 26hp Briggs that you have to
choke to get them to start. One of them has the
throttle lever hooked to choke so you have to push
the throttle lever all the way forward to choke and
when it starts pull it back quickly or engine will be
full throttle. Ed Will Oliver BC
 
Those engines likely have an extra little "nub" on the camshaft that pops the exhaust valve open a small amount for a short time just before TDC, relieving some cylinder pressure.

This is effective at cranking speed, still happens "at speed", but not enough time to have much effect, so it doesn't need to be "shut off" after starting, as Kohler did with the centrifugal ACR on the old K-series engines.

Throttle lever/choke has NO effect on the compression release function on your Briggses.
 
They have a centrifugally activated compression release that momentarily lifts the intake valve during starting.

If this link works, you will see how it works.

https://www.youtube.com/watch?v=tceKAAViC1c
 

Sometimes you run across an engine that will just "Lay Down" when it gets a good load on it..that suggests the valve clearance is not sufficient and the "De-Compression" is being over-done..

Just be careful adjusting the clearances..a little too much and the force needed to spin the engine over at start-up can be excessive..(but they don't lay down.!!)...
 
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