Vintage briggs 3hp carb issues

Tbstauffer

Tbstauffer

New Member
#1
#1
I rebuilt this Briggs 3hp on my mini bike and it just runs off and on. I will mess with the adjustment screw endlessly but it only makes some difference. Sometimes it will fire right up and run well, other times it will fire up for a second, then shut right back off. Other times it will run but sputter and pop under throttle. It's been fully torn down, cleaned and rebuilt with a new coil and spark plug. The points are gapped correctly along with the coil. It has good spark which leads me to believe it's a fuel issue. I'm not sure of the exact air/fuel mix setting. Any ideas? It's very frustrating.
 
Tbstauffer

Tbstauffer

New Member
#2
#2
Just saw it leaking a little gas from under the spark plug while trying to start it. Is it my plug? I correct myself, it's not a new plug.


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buckeye

buckeye

Well-Known Member
#3
#3
Basic settings.
1 1/2 turn out from just barely seated.
Then fine adjustments from there aprox 1/8th turn in or out to find the sweet spot.
Fly wheel key is good right?
Not a plugged gas cap?
Little crack in the plug or plug wire.
Which engine exactly and carb?:laugh:
 
Tbstauffer

Tbstauffer

New Member
#5
#5
Yes, fuel was creeping out under the plug. The gas cap actually isn't breathable at all. Flywheel key intact. I will try the cap and throw a new plug on then see.


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Tbstauffer

Tbstauffer

New Member
#6
#6
Threw a new spark plug on it, adjusted the carburetor and put a good gas cap on it. She runs awesome now, thanks for the tips!!


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