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Surging Briggs Stratton

M

Mark-Mi

Well-known Member
Location
S.E. Mi.
I put a new carb on my 11 hp B&S couple months back. Adjusted idle circuit screw so it idled well. Adjusted high speed screw till motor ran decent at full throttle. But the motor would buck some and work the governor. Repeat steps 1 and 2 several times, still no better.
Remembering that post from Zachary Hoyt back a ways some said the idle circuit was lean.
So today went to use power washer but first I opened idle screw half turn. Motor ran perfect.
I thought the idle circuit screw had no effect on full throttle operation. Any comments?
Anyway I sure appreciate what I learn on here. Thanks guys. Mark
 
The idle circuit affects operation anytime the engine isn't under load. Even at full throttle, if there's no load the governor will cause the throttle plate to close. This causes the idle jet to come into play; if there isn't enough fuel to keep the engine running the rpm drops and that causes the governor to open the throttle plate; hence the surging.
 
Carburetor adjustment will not cure it if the governor is out of adjustment. With engine stopped, loosen pinch bolt on governor arm. There may be a slot for a screwdriver in the end of the governor shaft, but if not, grab it with a pair of pliers. Hold the butterfly on the carb wide open. Now rotate the governor shaft in the same direction that the governor arm was moving, until it stops. The governor weights are now closed and all end play is removed from the governor assembly. Now, without disturbing anything, use your third hand to tighten the pinch bolt on the governor arm. The governor is now in adjustment. You can get a little more lost motion out of the system by making sure that long, skinny tension spring is hooked where it's supposed to be. (to the throttle lever and governor arm).
 
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