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Briggs and stratton 21HP engine surges, wont idle. 2013 Platinum 21HP 331877-4449-G5 w/ 20 hrs on it.

I have replaced fuel with fresh, cleaned & re-oringed(all) carb, changed fuel transfer tube, tried diff carb body, checked for vac leaks, checked FW key,checked and adjusted valves (Int was 0 lash),switched to grav. feed fuel supply to test, checked for bad hd gasket, all to no avail!! I can hold throttle still, but engine runs lean.Not my first mower rodeo, but I am baffled!! Only thing not done is ck gov adjustment. Honestly..... forgotten the process and specs.

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Dirt in the carburetor jets or fouled fuel.

Posted on May 03, 2017


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