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i have a 20 hp briggs twin with ohv that only runns on one cylinder


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07-05-11, 07:12 PM   #1  
i have a 20 hp briggs twin with ohv that only runns on one cylinder

i have a 20 hp briggs twin with ohv that only runs on one cylinder. from the seat the LH cylinder is running fine. it i take this plug wire off the engine stops but if i take the RH plug wire off nothing changes. ive swapped places with the the plugs, then swapped places with the coils and still get the same results. ive taken the carb down and cleaned it still no change. what next?

 
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07-05-11, 08:48 PM   #2  
Is the spark plug firing? Does it have compression?


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07-05-11, 08:54 PM   #3  
I would check the compression on each side. Could be a valve stuck open not allowing compression on that side (not too bad), could be a busted connecting rod (Pretty bad), could be electrical (always fun to figure out). You don't have to buy anything real expensive to do a basic test, remove the right spark plug and crank over the engine with your thumb over the plug hole. Should be enough pressure to blow your thumb away from the motor.

 
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07-06-11, 06:04 AM   #4  
i havent put the pressure gage on it yet but it does blow alot of air out when running with the plug out. the pistion moves as i can see it as i turn the motor by hand. yes the plug fires i took it out and touched it to the block while the engine was running. ive also changed places with the 2 coils and both plugs with the same results. ive read other post they say it still could be in the carb?

 
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07-06-11, 07:13 AM   #5  
Pull the valve cover off and make sure both push rods are still in place.


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07-06-11, 07:42 AM   #6  
Posted By: BFHFixit Pull the valve cover off and make sure both push rods are still in place.
they r and seem to move great when running, im not sure how to adjust or if that would help

 
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