Question about Briggs & Stratton Garden

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Briggs 407777, type 0121-E4

I have a 21 hp lawn tractor that when the blades engage I lose considerable power and the engine dies shortly thereafter. I have replaced spark plugs and properly set the gap, changed oil, checked coils, and added fuel stabilizer. I am preparing to regap the valves. Am I on the right track? Now the engine dies as soon as I engage blades.

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The engine is not developing power and the presence of a load causes it to slow down and quit all together. Is there some sort of timing advance on that motor? In a car if the timing is not right that is exactly what happens when you put the car into gear and try to use it.

I would not mess with the valves till I check out the timing.

Posted on Nov 24, 2013

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SOURCE: craftsman lawn tractor wont start

your fuel filter could be plugged

Posted on Jan 19, 2009

GM Elec
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SOURCE: Craftsman riding lawn mower...engine dies when blade is engaged

Push the clutch all the way down and try to start, does it crank over?
Let me know.
Regards,

Posted on May 10, 2009

wadembly
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SOURCE: Craftsman Lawn Tractor/ hard start/ whitish smoke

does it turn over slow or fast if it turns slowly thats the problem so it could be battery or starter they have to have a good amount of rpms to burn fuel right when starting if not it floods out the engine with gas hope this helps thanks wade

Posted on Jul 05, 2009

moretons
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SOURCE: oil capacity for 14.5 hp briggs engine

That would be 1.2lt to 1.4lt from empty

Posted on Aug 12, 2009

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SOURCE: John Deere 115 lawn tractor - won't start.

I have a 115 john deere tractor that runs but the engine will not run smooth I've put a new fuel cap on it a new pump and clean out the carb.

Posted on Aug 18, 2010

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