BRIGGS AND STRATTON BACKFIRE

This topic has 4 replies, 3 voices, and was last updated 1 week, 6 days ago by RPMS Inc..

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October 23, 2025 at 9:56 am #240249
Woodstock Automotive Machine Service
Participant
CUSTOMER HAS A 19HP BRIGGS THAT IDLES FINE BUT BACKFIRES AT SPEED.
HE HAS PUT ON A NEW CARB AND COIL AND CHECKED THE CRANK KEY.
WE CHECKED THE VALVES AND THE INTAKE VALVE WAS OFF QUITE A BIT
SO NEW INTAKE VALVE, GRIND THE EXHAUST VALVE AND MADE SURE EVERYTHING WAS SEALING.
PUT THE HEAD BACK ON, SET THE TAPPETS AND RUN THE ENGINE AND STILL BACKFIRES.
FRESH GAS NEW AIR FILTER, UNHOOK THE EXHAUST AND NO CHANGE.
ANY IDEAS WHAT ELSE TO DO?

DAVE 519 320 0916
October 23, 2025 at 10:11 am #240250
RPMS Inc.
Participant
Dave:

Have you tried a higher octane (slower burning) gas?
October 23, 2025 at 10:39 am #240251
Matthew Bauer
Keymaster
Lucas Octane Boost on the shelf at IPW – part number is 20026.
October 23, 2025 at 2:09 pm #240259
Woodstock Automotive Machine Service
Participant
THE CAMSHAFT LOBE FOR THE EXHAUST VALVE IS ROUNDED OFF.
THE VALVE OPENS A BIT BUT NOT ENOUGH TO EXPEL EVERYTHING.
October 26, 2025 at 1:35 am #240268
RPMS Inc.
Participant
Dave:

If you supply the B & S information we may have a replacement cam.
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