My Push Mower:
Yard Machine; 4HP 22"
Engine:
Briggs & Straton
Model: 10A902
Type: 2171B1
Code: 00032955
Air gap: .010
Plug gap: .030"
Last time I ran it - this year - it was hard to start, but seemed to run okay and finished lawn (didn't die, as I recall).
I removed air filter - for testing purposes.
I push primer bulb 3 times (gas squirts) - and engine only pops 3 or 4 times.
I spray starting fluid in carb and the engine only pops 3 or 4 times.
I remove plug and spray fluid directly into plug hole - same result
I have spark.
Dip Stick - shows oil full.
New spark plug.
New / rebuilt magneto
Cleaned fuel tank assembly.
Cleaned carburetor.
Replaced carburetor gasket and diaphragm.
So, I removed head - see photos:
P5240637.jpg
It will be easier to see the difference if you open each image in it's own window and view side-by-side.
P5240636.jpg
- only one of the valves opens and closes when I pull on the start cord. Is this my problem?
Yard Machine; 4HP 22"
Engine:
Briggs & Straton
Model: 10A902
Type: 2171B1
Code: 00032955
Air gap: .010
Plug gap: .030"
Last time I ran it - this year - it was hard to start, but seemed to run okay and finished lawn (didn't die, as I recall).
I removed air filter - for testing purposes.
I push primer bulb 3 times (gas squirts) - and engine only pops 3 or 4 times.
I spray starting fluid in carb and the engine only pops 3 or 4 times.
I remove plug and spray fluid directly into plug hole - same result
I have spark.
Dip Stick - shows oil full.
New spark plug.
New / rebuilt magneto
Cleaned fuel tank assembly.
Cleaned carburetor.
Replaced carburetor gasket and diaphragm.
So, I removed head - see photos:
P5240637.jpg
It will be easier to see the difference if you open each image in it's own window and view side-by-side.
P5240636.jpg
- only one of the valves opens and closes when I pull on the start cord. Is this my problem?
B&S - Won't Start, Valve?
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