Proper use of the choke

[1973 Ericson]

What is the proper way to choke the engine for starting.

Should you pull the choke fully closed to start and leave it closed intil the engine warms up? or once the engine starts do you open up the choke completely immediately.

I also find that if the engine stalls after it has fully warmed up I still need to pull the choke to get it to restart. Is this typical?

Could you give a brief summary of the how and why of proper use of the choke?
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[Hazelnut]

See Don's Post of 07-08-2005 on the Choke Adjustment Thread started by BruceM in the Fuel System Forum.

Hazelnut

[1973 Ericson]

Thank you Hazelnut...

I found the post by BRUCEM describing the adjustment and use of the choke.

A couple of things I found. My choke wasnt adjusted properly. The spring wasnt tight enough to bring the choke plate all the way back open. What effect does this have on the operation of the engine at normal cruising speed under load?

The Old Universal Manual says to immediately open the choke completely once the engine is started so it doesnt dilute the crank case oil with gasoline...how does this happen???

Tug
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[Don Moyer]

Tug,

In my opinion, the return spring on the choke is sort of an afterthought on the Atomic 4. You really must have the cable adjusted so that you have positive control over the choke valve to open and close it from the cockpit. If the choke valve does not open completely, the engine will run too rich,
causing fouled plugs etc.

I have seen industrial engine applications (compressors, drill rigs, etc.) which had a very flexible cable (or even a string) connected to the choke lever to pull it closed from the front of the engine for starting. In those cases the return spring would work to reopen the choke when the string was released.

Oil thinning would be a worst case scenario where the choke is closed far enough to draw so much fuel into the combustion chambers that some of the fuel (unburned) works its way down past the pistons and into the crankcase to thin the oil. In this situation the engine would be running extremely rough as a result of the overly rich mixture.

Don