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RUSS
RUSS, SERVICE TECHNICIAN
Category: Small Engine
Satisfied Customers: 3666
Experience:  28 YEAR SERVICE TECHNICIAN
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My Briggs & Stratton 20 hp V-twin Vanguard is hunting and surging.

Resolved Question:

My Briggs & Stratton 20 hp V-twin Vanguard is hunting and surging. The engine´s rpm varies up and down at any position of the throttle. The governor keep´s pumping and roaring. Please watch the short video-clip in my Dropbox: http://dl.dropbox.com/u/5425727/B%20%26%20S%20Vanguard.mpg What may cause the trouble?
Thank You! Lars
Submitted: 7 years ago.
Category: Small Engine
Expert:  RUSS replied 7 years ago.

hi here is where to start

YOU ALMOST CERTAINLY HAVE A CARBURETOR PROBLEM AND HAVE STICKING NEEDLE OR A BAD FLOAT.

 

 

REMOVE THE CARBURETOR

DISASSEMBLE THE CARBURETOR

SOAK BODY AND PARTS OVERNIGHT IN NAPA COMMERCIAL CARB CLEANER

REASSEMBLE WITH A CARB KIT FROM LOCAL DEALER ALONG WITH A FLOAT

REINSTALL CARB

DRAIN FUEL TANK AND LOOK IN THE FUEL SUPPLY CAN FOR WATER

Install new intake gaskets

NOTE: SOMETIMES A CARBURETOR CANNOT BE SAVED AND HAS TO BE REPLACED

 

ALWAYS DIAGRAM THE LINKAGE AND PARTS SO IT GETS REASSEMBLED PROPERLY

ALWAYS USE STABIL IN THE FUEL

ALWAYS RUN ENGINE EVERY THREE WEEKS IN OFF SEASON TO CIRCULATE FUEL

RUSS and other Small Engine Specialists are ready to help you
Customer: replied 7 years ago.
Hello Russ!
I may have pushed the wrong button yesterday when trying to pay you. I sholuld have told you that the mashine is very new, only som 30 hours running time so far. Nothing was wrong with the needle or the float but as you encoured me to reassemble the carburator I was able to blow the pipes and jets. Apparently there was some shit in the carburator and it is now working all right. I am satisfied so I´ll try again to pay you.
Regards
Lars