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Hot!22 horse V-Twin Briggs & Stratton

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Frankmig
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2019/06/06 14:54:24 (permalink)
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22 horse V-Twin Briggs & Stratton

On Startup it's great. Runs fine at idle and high-speed for about 30 seconds. Then it pops through exhaust and the idle starts to fluctuate at mid to high speeds. Idols pretty good at that point. I have check the coils for spark I have adjusted the valves which were ever so slightly loose. I have gone through the carburetor and check for intake leaks. It has me baffled. Runs 100% for 30 seconds then it starts to backfire out the exhaust. All the valves seem to travel the correct amount. Really don't think it's a valve guide problem or camshaft. I'm thinking I'm missing something on the carburetor. Lawn tractor only 5 years old and Well Service. one last thing on disassembly of the carburetor all the O-rings are fine from the ethanol gas still like brand new .Please help me LOL
post edited by Frankmig - 2019/06/06 15:01:41

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    Roy
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    Re: 22 horse V-Twin Briggs & Stratton 2019/06/06 20:11:53 (permalink)
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    Look for an overly lean condition. Heat could be causing the intake manifold to warp causing an air leak, check around the head mounts with a can of carb cleaner or WD-40. Also remove the shrouds and clean out the fins, they may be clogged.
    Frankmig
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    Re: 22 horse V-Twin Briggs & Stratton 2019/06/07 07:22:47 (permalink)
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    Thanks for your reply Roy. As I stated I did check for intake leaks. I check for warpage and cracks. The engine has been so well care for it never even got dirty so it's not running hot or never did. And it also doesn't even get a chance to warm up to give it the opportunity 4 things to expand and contract which might cause a leak it on the intake. Really has me baffled
    post edited by Frankmig - 2019/06/07 07:55:31
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