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Briggs Stratton Experts........

Goose

Goose

Well-known Member
A couple of weeks ago, I posted a thread about the cylinder on an 18.5hp, single cylinder Briggs engine filling with gasoline after it sat overnight.

Everything pointed to the carburetor, and I found I could order a complete new carb on the 'Net for $20.99 so I went that route instead of even messing with the old carb.

I installed the new carb a couple of days ago, and that solve the gasoline leaking into the cylinder problem, and it runs great except the engine surges a lot when it runs.

Is there an adjustment, or did I get a bad carburetor?
 
There should be a screw on the top of the carb that you can tweak a little. Had to do that with one I got a couple of years ago.
 
Surging is sometimes a result of too lean. Does a partial choke help?

Make sure there is no vacuum leak, possibly a gasket installed wrong.

You can try opening the idle mix screw a little.

Does it surge at full throttle with the PTO engaged? If not, probably not worth worrying with it. But if it is balky, looses power under heavy load, popping back through the carb, it could be too lean. The only fix for that is to open the main jet, trial and error, very small increments, like .001" at a time. Or look in the old carb, see what jet it has.
 
I doubt you got a real briggs carb for 20 dollars. I see this all the time in my shop. Pay the price and get the right carb.
 
Could be vacuum leak where carburetor fastest to the engine. Is there a piece of the old gasket still there making a vacuum leak.
 
I had a bad carb on my 3 1/2 horse briggs. went to there sight. 55 bucks. found out they all are made overseas. found one for 8.32 shipped. worked fine. suspect you might have a suction leak some where.
 
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