5 hp Briggs horizontal won't start

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  #1  
Old 10-29-07, 08:25 PM
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5 hp Briggs horizontal won't start

I am trying to fix a go kart that sat for about 1 year for my great nephews. The body work is done, but the engine is giving me problems. I cleaned out the gas tank, rebuilt the carb, and changed the oil. I started the engine and it ran okay, but was missing. I used some OMC engine tuner on it, changed the plug and now it won't start. I shot some starting fluid into the carb, but only got a pop. I then pulled the head, and cleaned the valves. I put it back together and still no run. The plug is getting fire, but I can't get the engine to even pop now. I am going to pull the head again and grind the valves. Anybody got the settings for the valves. Could the new plug just not be firing under compression?
Briggs HP Model135202 Type 0015 01 Code 9605 14
 
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Old 10-29-07, 11:34 PM
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Does it have compression?
 
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Old 10-30-07, 02:14 AM
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Intake valve clearance is .006" and exhaust clearance is .010". Did you install a new head gasket upon reassembly? Did you torque the head? How did the condition of the cylinder wall look? I've never used the OMC stuff or any other "miracle" engine cure for that matter because I subscribe to the rule that the only two things that belong in the combustion chamber and carburetor are gasoline and air and the ocassional fuel stabilizer, when needed for storage. I believe that if you have a carburetor problem you should remove it and recondition it.
 
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Old 10-30-07, 04:21 AM
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re 5HP Briggs

Originally Posted by itchmo View Post
I am trying to fix a go kart that sat for about 1 year for my great nephews. The body work is done, but the engine is giving me problems. I cleaned out the gas tank, rebuilt the carb, and changed the oil. I started the engine and it ran okay, but was missing. I used some OMC engine tuner on it, changed the plug and now it won't start. I shot some starting fluid into the carb, but only got a pop. I then pulled the head, and cleaned the valves. I put it back together and still no run. The plug is getting fire, but I can't get the engine to even pop now. I am going to pull the head again and grind the valves. Anybody got the settings for the valves. Could the new plug just not be firing under compression?
Briggs HP Model135202 Type 0015 01 Code 9605 14
iI installed new head gasket,and torqued the head to 140. no visible damage to cylinder wall, however I did not mike it. Does anybody know what it should mike at? It doesn't even fire if I put gas into the cylinder and replace the plug, even though the plug shows fire when I have it out and pull the starter. Does anybody know what the compression should be? Thanks for the valve clearance I will check that.
 
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Old 10-30-07, 06:32 AM
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If the new plug wasn't firing under load I would suspect the coil. May want to use a fine sandpaper and clean up the flywheel and the coil and see if that would improve the spark.

Coils go out. Had one go out on my B&S lawnmower.

If there wasn't any spark at all, I'd look for an exposed cut off swith wire.
 
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Old 10-30-07, 12:19 PM
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In some respect David has a point with the ignition. An engine requires more ignition strength to fire the plug gap under compression. Sometimes you will have fire at the plug when checked by grounding and checking externally but once installed you will have insufficient spark. The best way to determine if you have sufficient ignition strength is to use an inline spark tester. This may be your trouble but I'll bet you have a valve clearance issue, specifically no clearance on the exhaust valve and you would then have to grind the stem to gain the required clearance.
 
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Old 10-30-07, 05:16 PM
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Originally Posted by puey61 View Post
In some respect David has a point with the ignition. An engine requires more ignition strength to fire the plug gap under compression. Sometimes you will have fire at the plug when checked by grounding and checking externally but once installed you will have insufficient spark. The best way to determine if you have sufficient ignition strength is to use an inline spark tester. This may be your trouble but I'll bet you have a valve clearance issue, specifically no clearance on the exhaust valve and you would then have to grind the stem to gain the required clearance.
I think that could be it. It ran before I put the cleaner in and it popped when I tried to restart it. I don't think the ignition went bad between the cleaning and the restarts. I have heard that some plugs won't fire under compression though.
Anyway I still am going to check the valves and mike the cylinder. Thanks for your input
Itch [/I]
 
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Old 10-31-07, 05:53 AM
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re 5HP Briggs

Originally Posted by puey61 View Post
Intake valve clearance is .006" and exhaust clearance is .010". Did you install a new head gasket upon reassembly? Did you torque the head? How did the condition of the cylinder wall look? I've never used the OMC stuff or any other "miracle" engine cure for that matter because I subscribe to the rule that the only two things that belong in the combustion chamber and carburetor are gasoline and air and the ocassional fuel stabilizer, when needed for storage. I believe that if you have a carburetor problem you should remove it and recondition it.
checked the valve clearance and there was none on either valve. intake valve seems to be bent as I can not get it out. Any suggestions
 
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Old 11-01-07, 01:29 AM
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The intake valve is what I was getting at when I asked if you had any compression (maybe you missed my post?). Common on these engines when water is allowed into them through the carburetor. It's most likely stuck and may work loose with some patience and penetrating oil, or it may be a bigger problem if it doesn't come loose.
 
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Old 11-01-07, 07:22 PM
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Thumbs up re briggs

Originally Posted by cheese View Post
The intake valve is what I was getting at when I asked if you had any compression (maybe you missed my post?). Common on these engines when water is allowed into them through the carburetor. It's most likely stuck and may work loose with some patience and penetrating oil, or it may be a bigger problem if it doesn't come loose.
Thanks Cheese. Didn't get your first reply. Checked the valves and both were sticking. Cleaned them up and lapped them. Also, there was no clearance on either valve. Ground them and will try to start it tomorrow
 
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Old 11-04-07, 08:51 AM
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What's the outcome, itchmo?
 
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