Briggs Stratton Intek Problems

Anonymous-0

Well-known Member
I am working on a Briggs and Stratton 19.5 HP Intek vertical engine. Once it is started it runs erratic. Could it be a timing or fuel problem? Any help would be appreciated.
 
First thing to do is post mod/type numbers of eng,the intek is/was made in single cyl/twin cyl versions,we have no idea what you have.

Next give a better description of your term erratic as far as eng operation.

1-eng surges/hunts for it's speed or won't idle.

2-eng over speeds/slows down or dies when load applied.

3-eng slow cranking/hard starting.

4-knocking/rapping sounds when eng running.

A better description of problem can help us determine/narrow down possible source of problem to timing issue,ign system,fuel system or possible mech problem outside/inside eng.
 
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.
 
I would check your valve clearance, overhead valves need to be set every so often. The gap is .005 for both I think. I bet it is the head gasket. I have the same motor it had lots of compression and would push oil out the intake breather tube, and backfire when I shut it off. $11.00 head gasket, resetting the valves and a couple of hours it was good to go. I have put about 100 hours on it since been great!!
 
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.
 
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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