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Garden Tractors Discussion Forum

Re: Briggs Stratton Intek Problems

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Gabriel H.

09-20-2013 06:10:16

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The model number is 31P677. Type number is 0804-B1. Code number is 080616ZD. It is a single cylinder. When it runs, it sounds like it is constantly backfiring. It's like as if it has a blown head gasket, but I don't think that's the problem because it still has good compression.

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joe csuti

09-20-2013 17:39:46

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 Re: Briggs Stratton Intek Problems in reply to Gabriel H., 09-20-2013 06:10:16  
The 1st thing to do is check valve clearance as matt said,clearance is checked/set when piston PAST tdc of compression stroke & 1/4" into it's downward travel,if resetting valves doesn't cure problem,next check flywheel key,same may be bent/sheared changeing ign timing,if key ok I would then suspect a problem in fuel system,possible causes,plugged/restricted fuel filter,dirt/water in tank plugging/restricting outlet,bad lines between tank/carb,weak fuel pump(if eng has)dirt/water in carb bowl/internal passages in carb body,sticking float,leaking float valve,dirt in float needle seat,air leak at carb mounting gasket.

If not a fuel system problem other possible causes,leaking rather than a blown head gasket,worn cyl/rings,scored cyl walls,worn valve guides,valves leaking/sticking due to carbon buildup on stems,valves & valve seats,bad/damaged valve seat,warped/damaged valve,worn valve guides,before pulling head consider doing a leakdown test on eng,may help you pinpoint an internal cyl/ring problem,leaking valves or a leaking/blown head gasket.

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Gabriel H.

09-21-2013 07:25:31

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 Re: Briggs Stratton Intek Problems in reply to joe csuti, 09-20-2013 17:39:46  
I found the problem. The choke lever that goes into the carburetor is missing the return spring. The engine was running in constant choke, causing the erratic operation.

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