Briggs Carburetor on Lincoln Weldanpower

G6 at Snook, TX · Aug 8, 2014

I have asked various questions about this welder before, but it is a Lincoln Weldanpower from the mid to late 1980s powered by a Briggs I/C 16hp motor. It has a carburetor. Today while set on the auto-idle (in the low range) setting, the motor got to acting up where it lost rpm and finally died out. When running on high idle it had no problems and had plenty of power.

On the low idle setting, what would normally cause this? Am I right to assume it is trash in the carburetor? For those with experience with this carburetor, any special tricks on adjusting the low idle?

I didn't have time to really tackle the problem today, but I will get at it tomorrow. Here is a picture of the machine in question.

Thanks.

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Steve@Advance · Aug 8, 2014

Look things over good, make sure the carb and
manifold are tight, no vacuum leaks, air filter
clean.

Look at the throttle shaft for excess play. If the
shaft/carb bore are worn it will have a vacuum
leak and not return to the idle stop screw
consistently.

Check the auto idle linkage and the governor
linkage. Nothing worn, or binding, or grease
caked.

Try adjusting the idle mixture, the top adjustment
screw. With the engine up to temp and idling, turn
the screw in until the engine stumbles, then back
out so it runs good, then back out another 1/8 yo
1/4 turn.

If the adjustment makes no difference, or runs
better turned all the way in, the carb needs
cleaning.

Idle problems are't always carb problems. Don't
think this one has points, but if it does, they
could be needing attention. Poor idle is also a
symptom of loss of compression.

cwtech · Aug 9, 2014

Follow Steve"s advice, he"s right on.

However, before tearing the carb apart, I would try SEAFOAM additive to the gas tank, and let the engine run awhile.

I am not normally a fan of additives, but I have seen some amazing results from using Seafoam.

(I was in the small-engine business for 25+ years, and have never seen an additive work the way Seafoam does.)

johnlobb · Aug 9, 2014

I've used Seafoam with good results, but for cleaning out a carburetor I've found that "Mechanic-In-A-Bottle" works better than anything I have ever seen, available at Tractor Supply, and Family Farm and Home stores in a small 4 oz bottle.

John730D · Aug 9, 2014

That model does have points, I would check them. They are on the side of the engine by the fuel pump.
Could be a weak fuel pump, or that little fuel filter is getting plugged. The first thing I would do is replace the fuel filter.

G6 at Snook, TX · Aug 9, 2014

That motor has no fuel pump that I can see. It is just a gravity feed system. If so, where would I look for points then? This is just a single cylinder cast iron head.

I will go through the check list Steve put out.

Thanks,
NDG

Steve@Advance · Aug 9, 2014

If it has points, they will be under a rectangular
cover on the side of the block with a couple of
wires going into the cover. I'm guessing .020" gap,
but better double check that.

Briggs Carburetor on Lincoln Weldanpower

G6 at Snook, TX

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Steve@Advance

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cwtech

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johnlobb

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John730D

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G6 at Snook, TX

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Steve@Advance

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