Hello All.
Kinda Quick "complete" back story
,
This is a 8yr old Ariens 46" riding mower with Briggs 331777-2372-G5 20HP OHV INTEK single cylinder engine. Given to me after it quit running.
I suspected it had a broken rod and pulled the engine. The rod/cap was broken and no other damage to case "except" the sump cover's bearing surface for crank shaft was scored from debris.
I Cleaned the housing of old oil and debris, installed new piston, piston rod, rings and ordered new sump cover/gaskets.
When I reassembled, I was careful timing marks "dots" were correctly aligned and governor was resting correctly against tab, then tighten everything to B&S spec's.
I had also pulled the head to install new piston and inspect valves. The valves were fairly clean seated and not bent. After closing the sump cover, replacing head gasket and installing the head; I checked valve clearance and it seemed fine. "made sure correct Aluminum push rod under intake"
I reinstalled completed motor on mower and proceeded to pull the Fly wheel bolt to see if the key-way had sheared and indeed it did! Replaced key-way and reassembled.
Inspected gap on magneto coil and it seemed fine/not moved.
Tried to start it once but backfired and I quit for the day."figured to be back on it in morning"
Next day I went to start and this time it STOPPED rotating at compression stroke. I suspected I may have over looked proper valve adjustment and pulled the valve cover.
"Gasoline" came pouring out of valve area. Drained the engine sump and found all the contents of fuel tank had drain into engine over night. Read a post about this condition and pulled the anti backfire solenoid. I found it was slow to move/sticking. Cleaned the solenoid out and inspected the carburetor visually while still attached to engine. The bowl was very clean and float adjustment seemed fine. Reassembled every thing, rotated engine with new oil, drained and added new oil again.
(wanted anyone reading to have complete rebuild history)
All That to lead to this question: Battery is fully charged, engine turns over as excepted but it backfires from both carburetor and exhaust randomly no matter the throttle setting.
Never starts or runs even a little "although the engine seems to out pace the starter some times" as though it's firing some.
I have checked gas, "no water"
Checked valve clearance again. ."is good"
I checked flywheel key again "it's good"
New spark plug and is getting good arc,
Sprayed starter fluid direct in breather tube "no filter" and still just back fires.
I'm at a loss. Maybe carb needs cleaning, but I thought it would run at-least a little with starter fluid. ALL suggestions or any questions are welcome, please
Thanks in advance!
Kinda Quick "complete" back story
, This is a 8yr old Ariens 46" riding mower with Briggs 331777-2372-G5 20HP OHV INTEK single cylinder engine. Given to me after it quit running.
I suspected it had a broken rod and pulled the engine. The rod/cap was broken and no other damage to case "except" the sump cover's bearing surface for crank shaft was scored from debris.
I Cleaned the housing of old oil and debris, installed new piston, piston rod, rings and ordered new sump cover/gaskets.
When I reassembled, I was careful timing marks "dots" were correctly aligned and governor was resting correctly against tab, then tighten everything to B&S spec's.
I had also pulled the head to install new piston and inspect valves. The valves were fairly clean seated and not bent. After closing the sump cover, replacing head gasket and installing the head; I checked valve clearance and it seemed fine. "made sure correct Aluminum push rod under intake"
I reinstalled completed motor on mower and proceeded to pull the Fly wheel bolt to see if the key-way had sheared and indeed it did! Replaced key-way and reassembled.
Inspected gap on magneto coil and it seemed fine/not moved.
Tried to start it once but backfired and I quit for the day."figured to be back on it in morning"
Next day I went to start and this time it STOPPED rotating at compression stroke. I suspected I may have over looked proper valve adjustment and pulled the valve cover.
"Gasoline" came pouring out of valve area. Drained the engine sump and found all the contents of fuel tank had drain into engine over night. Read a post about this condition and pulled the anti backfire solenoid. I found it was slow to move/sticking. Cleaned the solenoid out and inspected the carburetor visually while still attached to engine. The bowl was very clean and float adjustment seemed fine. Reassembled every thing, rotated engine with new oil, drained and added new oil again.
(wanted anyone reading to have complete rebuild history)
All That to lead to this question: Battery is fully charged, engine turns over as excepted but it backfires from both carburetor and exhaust randomly no matter the throttle setting.
Never starts or runs even a little "although the engine seems to out pace the starter some times" as though it's firing some.
I have checked gas, "no water"
Checked valve clearance again. ."is good"
I checked flywheel key again "it's good"
New spark plug and is getting good arc,
Sprayed starter fluid direct in breather tube "no filter" and still just back fires.
I'm at a loss. Maybe carb needs cleaning, but I thought it would run at-least a little with starter fluid. ALL suggestions or any questions are welcome, please
Thanks in advance!
