816 CCKA - top of carb gasket wet while running? - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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Old 07-03-2013, 10:22 PM   post #1 of 4
Fossil
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Location: Atlanta, Ga
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Default 816 CCKA - top of carb gasket wet while running?

My 197? 816 w/ CCKA is a bit down on power.
Tractor has acted this way since I bought it and freshened it up.
Tractor starts immediately and idles smoothly and steadily cold or hot.
My ear tach says the RPMs are slightly lower when warm vs immediately after cold start.
Mowing my residential bermuda grass weekly with my 50" deck slows the mower and the tractor.
Without the mower engaged the tractor seems to have plenty of power in 4th gear high.
I put new bearings/blades/pulley/belt on the mower this year.
When I disengage the PTO the mower seems to spin down reasonably freely.

I tested compression;
adjusted valves to spec;
put new plugs in;
new pojnts & condensor;
swapped in a used 12 V coil; (blue spark @ plugs)
refreshed carb with cleaning & rebuild kit; (float set at 1/4" from gasket)
adjusted idle & high speed jets
timed engine with timing light; (about 18 degrees)
put in new rod that activates points;
elec fuel pump;
fuel filter; and
installed a new ignition switch ( system charges fine).

The carb inlet hose puts out a solid stream of gas for more than a minute - as long as I cared to test it.

Tonight I noticed that there is essentially a small puddle of gas on the upper side of the carb bowl gasket that can be observed looking down into the venturi while the engine idles. It looks as though no gas is on the upper side of the gasket after the engine is shut off. Is this a sign of a problem?

The float is a black foam float - like the ones sold on ebay. It seems dry but I do not know how to evaluate it.
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Old 07-04-2013, 07:45 PM   post #2 of 4
boomers_influence
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Default Re: 816 CCKA - top of carb gasket wet while running?

fossil
what electric fuel pump are you using?
i hope it is a small engine one 2/3 psi. max.
thank you. boomer ( the used onan engine parts guy )
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Old 07-04-2013, 08:14 PM   post #3 of 4
Fossil
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Default Re: 816 CCKA - top of carb gasket wet while running?

I am using the small cubic pump from NAPA. I believe it puts out 1-4 PSI.
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Old 07-05-2013, 03:58 AM   post #4 of 4
Richard-tx
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Default Re: 816 CCKA - top of carb gasket wet while running?

The problem with electric pumps is that they are constant flow which means it is trying to shove as much gas at the carb as it can all the time. This is different than a mechanical or pulse pump in that the amount of fuel being delivered is dependent on engine speed.
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