Briggs 28Q777 being a pain in the proverbial.

bertsmobile1

Lawn Royalty
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Nov 29, 2014
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Yes that will create a problem.
Put simply it was the wrong solenoid.
Some ground through the carb some ground via the plug.
The graound on the plug usually goes to a tiny 1/8" bolt that holds the lower shroud on which is very often loose or missing so you get a bad ground.
The single wire type is for carbs that bolt directly to the engine or use a metal manifold.
And yes the two types do regularly get mixed up.
You can toss it all together, they are not an EPA requirement down here but do make a good back up should the ground wire to the coil fall off, you have a secondary stopping mechanism other than running around the front and zapping yourself trying to remove the spark plug.

So for the purpose of diagnosing, you can replace it with a standard UNC bolt with an O ring under it, thus eliminating one potential source of problems.

And on that topic, it looks like the replacement was a Nikki type, with the white plastic jet holder between the float body & carb body.
If so the main jet just sits in the bottom of the tube , held in by the O ring.
Very easy to knock it out if you are not watching what you are doing, particularly if you start tossing compressed air around.
 
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