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5hp Briggs and Stratton blowing fire


 
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JD the Shadetree Mechanic
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Joined: 24 Jun 2010
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PostPosted: Thu Jun 24, 2010 8:10 pm    Post subject: 5hp Briggs and Stratton blowing fire Reply to specific post Reply with quote

I have recently rebuilt a 5 hp briggs (model 130202) which belongs to a magna tiller. I replaced the points and condensor system with a magnatron solid state coil. It fires great. However, it seems to be very easy to pull the recoil to crank (like it has no compression, but it does). It pops a couple of times but refuses to crank (although it seems to be on the edge of running). Just after a few sputters are heard a fire ball puffs out of the exhaust hole and the intake on the carberator. Almost as if someone had accidentally swapped plug wires on a car making the timing incorrect. The engine also seems to flood badly. The carb is set at 1.5 turns out and the coil is set at .015". Any idea on this matter? Thanks, JD.
 
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joe csuti
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PostPosted: Fri Jun 25, 2010 2:28 am    Post subject: Re: 5hp Briggs and Stratton blowing fire Reply to specific post Reply with quote

Low compression can be caused by leaking head gasket/warped head,if old valves reused/new valves installed,valves lapped incorrectly,if new valves installed,check tappet clearance,on some mod briggs eng when replacing valves,the stems on new valves must be ground to obtain proper clearance,rings could be leaking if std ring set used,rings installed incorrectly or cyl not honed to break glaze OR eng needs a rebore & os piston set installed,as a last resort open eng & check that timing marks on crank/cam line up,you may be 1/more teeth out,flooding can be caused by dirt in float needle seat,sticking/defective float or an out of level float
 
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Kentb of SWMO
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Joined: 01 Sep 2007
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PostPosted: Fri Jun 25, 2010 4:56 am    Post subject: Re: 5hp Briggs and Stratton blowing fire Reply to specific post Reply with quote

Coil gap at .015 is a little wide. I use a business card trapped between the coil and the magnets when I tighten the coil mounting screws. This works out to about .010.

Kent
 
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JD the Shadetree Mechanic
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PostPosted: Tue Jul 06, 2010 7:13 pm    Post subject: Re: 5hp Briggs and Stratton blowing fire (Solved) Reply to specific post Reply with quote

I pulled the spark plug and looked down in the plug hole. The piston was TDC, the exhaust valve is in time and functioning correctly, however the intake valve was half open and wasn"t functioning. Upon further inspection the valve keeper on the stem of the intake valve was worn and had slipped off. Thus the exhaust valve was sucking gas thru the carb. and the the intake valve (being half open) was close enough to the plug to cause the gas to combust. Next the exhaust cycle would kick in. Finally ending up as a flame thrower... Nuff said.
 
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