Symptoms:
Rough idle.
Fuel coming from front of lower carb only when engine is running.
Raw fuel trail begins at lower engine cowl, and runs down outside of Exhaust housing and onto lower unit.
Grey foamy substance exiting center of prop where exhaust exits.
With engine running on ear muffs, a oily, raw smelling gas residue appears on ground behind where exhaust exits prop.
#4 spark plug remains clean as new. #2 spark plug is showing signs of firing but not as dark as #1, and #3.
Looking at spark plugs all are wet with un-burned fuel at base of ceramic center.
What's has been tested:
Compression.....good.
Removed spark plug boots with engine running. No change in RPM with #4 spark plug boot removed/replaced.
New Champion Spark plugs installed set at 0.28 gap.
Coils #4 and #2 sensor wires and spark plug boots switched. #4 cylinder remained unchanged when plug boot removed.
Both Carbs removed. Blew through fuel inlet with carbs upside down to test for needle seat closing. Needle/seats are fine. Cleaned and rebuilt BOTH carb's anyway, using OMC kits that included new floats set when upside down even with carb bowl base, floats set when upright with 1" drop. Weighed old floats (5g). New floats (6g). Tipped newly rebuilt carbs upside down, blew through gas inlet, needle seated.
With air silencer removed, placed my hand in front of carb throats when engine running, could not feel air back flow.
I have had the fuel line connected to the motor, with primer bulb pumped until firm, over night. Checked 12 hours later and there is no fuel coming from front of carb or running down outside leg of motor where fuel appears with engine running.
My extensive reading tells me this is not a Reed problem. But that is where I am leaning. On this motor could this be a Fuel pump over pressure issue (With only carb barfing fuel) ?
Rough idle.
Fuel coming from front of lower carb only when engine is running.
Raw fuel trail begins at lower engine cowl, and runs down outside of Exhaust housing and onto lower unit.
Grey foamy substance exiting center of prop where exhaust exits.
With engine running on ear muffs, a oily, raw smelling gas residue appears on ground behind where exhaust exits prop.
#4 spark plug remains clean as new. #2 spark plug is showing signs of firing but not as dark as #1, and #3.
Looking at spark plugs all are wet with un-burned fuel at base of ceramic center.
What's has been tested:
Compression.....good.
Removed spark plug boots with engine running. No change in RPM with #4 spark plug boot removed/replaced.
New Champion Spark plugs installed set at 0.28 gap.
Coils #4 and #2 sensor wires and spark plug boots switched. #4 cylinder remained unchanged when plug boot removed.
Both Carbs removed. Blew through fuel inlet with carbs upside down to test for needle seat closing. Needle/seats are fine. Cleaned and rebuilt BOTH carb's anyway, using OMC kits that included new floats set when upside down even with carb bowl base, floats set when upright with 1" drop. Weighed old floats (5g). New floats (6g). Tipped newly rebuilt carbs upside down, blew through gas inlet, needle seated.
With air silencer removed, placed my hand in front of carb throats when engine running, could not feel air back flow.
I have had the fuel line connected to the motor, with primer bulb pumped until firm, over night. Checked 12 hours later and there is no fuel coming from front of carb or running down outside leg of motor where fuel appears with engine running.
My extensive reading tells me this is not a Reed problem. But that is where I am leaning. On this motor could this be a Fuel pump over pressure issue (With only carb barfing fuel) ?