I have a Briggs and Stratton 5 HP horizontal crankshaft engine with a Pulsa-jet small well carburetor.
The tank had bad rust on the inside so I replaced with a new B/S tank. I took the pump cover off the side of the carb and cleaned all the fuel passages and replaced the diaphragm with B/S genuine part. I put a wire into the short pickup tube all the way up through the main jet and also sprayed carb cleaner up through the jet. New spark plug, air filter installed.
The engine starts right up and sounds great for about 60 seconds at full throttle. Then it starts not sounding so great. It's hard to describe, but it sounds like it's moving in/out full throttle and almost sounds like it's misfiring because I hear kinda like a thumping or popping sound every few seconds which is not natural. I'm not describing this very good. When it starts up and is running good for the first 60 seconds, the choke lever hardly oscilates at all. When it goes into the bad running cycle, the choke lever is oscilating back and forth more than normal like it's struggling. Also, it never recovers and goes back to the initial 60 seconds of running good. It never dies, but it never goes back to running good.
No problems at idle, the engine sounds fine. I did not take the welch plug off the side to expose the idle fuel mixing well, but I'm thinking these orifices would not be the problem if it is idling fine, but I may be wrong?
Any help would be appreciated. Thanks.
The tank had bad rust on the inside so I replaced with a new B/S tank. I took the pump cover off the side of the carb and cleaned all the fuel passages and replaced the diaphragm with B/S genuine part. I put a wire into the short pickup tube all the way up through the main jet and also sprayed carb cleaner up through the jet. New spark plug, air filter installed.
The engine starts right up and sounds great for about 60 seconds at full throttle. Then it starts not sounding so great. It's hard to describe, but it sounds like it's moving in/out full throttle and almost sounds like it's misfiring because I hear kinda like a thumping or popping sound every few seconds which is not natural. I'm not describing this very good. When it starts up and is running good for the first 60 seconds, the choke lever hardly oscilates at all. When it goes into the bad running cycle, the choke lever is oscilating back and forth more than normal like it's struggling. Also, it never recovers and goes back to the initial 60 seconds of running good. It never dies, but it never goes back to running good.
No problems at idle, the engine sounds fine. I did not take the welch plug off the side to expose the idle fuel mixing well, but I'm thinking these orifices would not be the problem if it is idling fine, but I may be wrong?
Any help would be appreciated. Thanks.
Briggs and Stratton 5 HP Horizontal - Runs good for 60 seconds, then down hill
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