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Hit & Miss Gas Engine Discussion

Briggs Stratton Model 8


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  #1  
Old 03-09-2019, 04:17:00 PM
Cinamon Cinamon is offline
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Default Briggs Stratton Model 8

Iím in the process of restoring an old mower. It has a Briggs and Stratton model 8 Engine. Iím having issues getting it running. Itís getting spark. Gas tank has been cleaned out, new fuel line, carb has been cleaned ( not rebuilt). The carb is getting gas, it just will not turn over.
Any thoughts???

Thank you
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Old 03-09-2019, 06:52:58 PM
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John Newman Jr. John Newman Jr. is offline
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Default Re: Briggs Stratton Model 8

Spark and fuel are good, but it needs compression, too. Does it have any? No need for elaborate test measures. Just give the flywheel a spin and if it bounces back on compression, it is good. If it just mushes through, look into whether or not the valves are closing fully. Can you hear pressure leakage when it is on the compression stroke? Maybe the head gasket is damaged? Beyond that, it could be rings and worst case, the cylinder is so worn that you will need an oversize piston and rings.
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Old 03-10-2019, 12:09:08 AM
gdstew gdstew is offline
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Default Re: Briggs Stratton Model 8

Try to start, then take out the spark plug. Is the plug wet with gas? This will give you a clue which way to proceed
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Old 03-10-2019, 09:37:00 AM
OrgWayne OrgWayne is offline
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Default Re: Briggs Stratton Model 8

Cinnamon, try going on u-tube and look up Mustie1, he's Real good at getting Motors started , no matter how long they sit , Good Luck
Wayne
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Old 03-10-2019, 03:30:51 PM
Cinamon Cinamon is offline
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Default Re: Briggs Stratton Model 8

The spark plug is dry after I try starting it a couple times.
Feels like it has compression Iím going to confirm tomorrow with a compression tester. I am noticing the carb is leaking gas from the air cleaner elbow brace. Is there a fix for that ? I put a new bolt in and itís still leaking. Iíve attached a pic. The ignition wire needs to be replaced but it still getting spark.
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Old 03-10-2019, 04:34:09 PM
gdstew gdstew is offline
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Default Re: Briggs Stratton Model 8

Ignition wire--do not use a modern carbon wire, use one that has wire inside. Twist the end to the coil, do not solder.

To see if it will run, put a little gas in the spark plug hole, and try.

Not getting gas--Exhaust valve not seating. When piston lowers, instead of drawing gas through the intake, it draws air from exhaust. Or possibly carb is plugged up. To take carb apart you first have to remove the main nozzle. Remove the whole adjustment assy. Up inside there is a brass nozzle, probably pretty tight. Make a blunt screwdriver, of the correct width, and fits the slot real good. Otherwise you will destroy the slot and have to drill out the nozzle. You can then take the carb apart. If the carb drips all the time, the needle & seat will need to be replaced. If it drips only when being cranked, it's just flooding.
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Old 03-10-2019, 04:40:41 PM
K-Tron K-Tron is online now
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Default Re: Briggs Stratton Model 8

Just a heads up, if you have to pull the flywheel on your model 8 engine for whatever reason, THE FLYWHEEL RETAINING NUT IS REVERSE THREADED. It sounds to me like your carburetor is plugged up, or the valves are not sealing. It should be pulling fuel. Check that the float in the carburetor is actually allowing fuel to enter the carburetor. If the carburetor is troublesome remove it all together. Fill a spray bottle with gasoline and squirt some into the intake port. Give the engine a crank and see if it will run on the fumes. You may have to partially cover the intake port to get it to initially suck the fumes in. If it runs, it tells you that you have sufficient compression and spark. Grinding and lapping the valves on these engines is easy, just make sure the valve clearances are within range. Too small and the valve will not close.

Chris
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Old 03-10-2019, 04:56:05 PM
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Default Re: Briggs Stratton Model 8

I tried gas in the spark plug hole, no luck

I was going to get a carb rebuild kit and replace and clean everything. It sounds like it wants to start. Itís got the smell of if it was running ( if that makes sense ) one time when I tried to start it we noticed a blue ignite/spark when we had the muffler off. After trying a couple times thatís when the gas really drips from the brace. Silly question but could this be something as simple as that ignition wire or wrong spark plug stopping it from starting? Itís a new plug but I see these videos on line and 5 min of tinkering and the motor starts up. Iím over thinking this?!?!?!
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