Motor runs, shuts off, runs and shuts off, runs as if it has no problem

[michaelneff22]

Engine: Briggs and Stratton 17hp Intex single cylinder.

Mower has a new battery, new carb and a new starter. I also have checked the valve clearances and they are fine.

Mower sometimes stops on the compression stroke as if the compression release is broken but I am positive the compression release isn’t broken b/c if you turn the motor over by hand past the compression stroke it’ll turn over fine all day long. I’d like to fix this issue too but the below issue is my biggest concern.


Cranking/ Turn the mower over you can see fuel spray/ kind of spit out the intake of the carb as the motor is turning over.

While choking it, it’ll back fire out the carb and out the exhaust, motor will pop and then it’ll start and run for 5 seconds and shut off.

Choke it and it’ll run for 5 seconds again and shut off.

Choke it, it’ll start and with choke off it’ll run perfectly fine as if nothing is wrong. No back fire, no sputtering.

Driving and with the blades on It runs perfectly fine.

Put the mower in reverse with the blades off it wants to stall out. It does have the safety switch when the blades are on that the engine stalls out.

 

[Scrubcadet10]

Mower sometimes stops on the compression stroke as if the compression release is broken but I am positive the compression release isn’t broken b/c if you turn the motor over by hand past the compression stroke it’ll turn over fine all day long. I’d like to fix this issue too but the below issue is my biggest concern.

So what you're saying is that if you do that ONE time. it will start up fine on other starts for the rest of the day?

 

[bertsmobile1]

The ACR is not working
As it is sort of random, that points to a wide valve lash.
Had a customer who stored his mower is a very cold shed
All winter ( we mow all year here ) it would not start when he tried in the morning.
He would push it out & when I turned up some time between mid morning or early afternoon , it would fire right up , first go .
Eventually he just pushed it out into the sunlight and mowed in the afternoon ( better for the grass in any case )
When I finally got it to the workshop the valve lash on the inlet was near 0.030"
Adjusted it back to 0.004" and never heard a word from him for another 3 seasons .

Decompression not happening is either caused by the valve lash being so big it is bigger than the decompression cam lift.
or
The decompression mechanism had left the building.

 

[michaelneff22]

So what you're saying is that if you do that ONE time. it will start up fine on other starts for the rest of the day?

After running fine for a while when it's hot, you have to choke it again and go through the whole process.