Joined
·
178 Posts
Hi All!
I have a 28 year old "Franken-Mower" with a Briggs + Stratton 3.5 HP engine
Model 95902 Type 3147 01. It's got a diaphragm type carburetor.
(Franken-Mower = Made out of several grave robbed deceased lawn mowers, but the engine has been mine since new.)
For the last couple of years, it will surge and stall often until the engine warms up for several minutes. This is with no load- I don't move the mower until the engine is warm & stable.
I am stumped for the cause. I also have to leave the throttle on high speed (ca 1800 rpm) while it warms up, otherwise it will stall for sure.
I've treated this engine like a king since it was new, as I do with all of my tools:
The engine is run-until-stall (out of fuel) after each use.
The fuel has stabilizer.
The cord is pulled until resistance is felt before storing (to keep valves closed so no moisture enters the cylinder.)
The gas is always fresh- up to 2 months old at the oldest. Stored in air tight container.
I've tried:
New carburetor diaphragm & gaskets. (Three times)
Carburetor Cleaner (Spray & long soaking)
New Primer button
New Fuel filter (A pick up tube with a screen)
Clean Air Cleaner
New Spark Plug (Twice)
I have even older engine tools- up to 50+ years old- with diaphragm carburetors that have no problems, just this mower engine has the bad attitude.
The part that really has me stumped is that it runs fine once it has warmed up.
That tells me the carburetor is OK and the problem is elsewhere.
Do any of you know something else I can try to get this engine running well again?
Thanks for sharing your knowledge!
Be Sure To Enjoy Today,
Paul
I have a 28 year old "Franken-Mower" with a Briggs + Stratton 3.5 HP engine
Model 95902 Type 3147 01. It's got a diaphragm type carburetor.
(Franken-Mower = Made out of several grave robbed deceased lawn mowers, but the engine has been mine since new.)
For the last couple of years, it will surge and stall often until the engine warms up for several minutes. This is with no load- I don't move the mower until the engine is warm & stable.
I am stumped for the cause. I also have to leave the throttle on high speed (ca 1800 rpm) while it warms up, otherwise it will stall for sure.
I've treated this engine like a king since it was new, as I do with all of my tools:
The engine is run-until-stall (out of fuel) after each use.
The fuel has stabilizer.
The cord is pulled until resistance is felt before storing (to keep valves closed so no moisture enters the cylinder.)
The gas is always fresh- up to 2 months old at the oldest. Stored in air tight container.
I've tried:
New carburetor diaphragm & gaskets. (Three times)
Carburetor Cleaner (Spray & long soaking)
New Primer button
New Fuel filter (A pick up tube with a screen)
Clean Air Cleaner
New Spark Plug (Twice)
I have even older engine tools- up to 50+ years old- with diaphragm carburetors that have no problems, just this mower engine has the bad attitude.
The part that really has me stumped is that it runs fine once it has warmed up.
That tells me the carburetor is OK and the problem is elsewhere.
Do any of you know something else I can try to get this engine running well again?
Thanks for sharing your knowledge!
Be Sure To Enjoy Today,
Paul