B&S 12.5 HP Engine: Piston Ring Replacement, Scratches on Piston Surface - Is it Suitable?

Hello, it looks like this. The mower kicked me too hard on an underheated engine, it took oil. I decided to do a small renovation. Replace rings. After dismantling the piston, I noticed scratches on its surface (photo). Is the piston suitable for use? I would not like to come back to it in a moment.

Hello. This piston is quite scratched and has pits that I would not mount. One more thing in what condition is the cylinder and does it have such features?

Amazingly, the cylinder is smooth, then I will take a picture.

So how is the cylinder ok, change the piston and check what is the gap in the cylinder rings?

Ok, I'll check, I will definitely know, because I don't know what the maximum can be.

Hello, it looks like this. I replaced the piston, rings, connecting rod. I put everything together properly, tightened it with proper forces, flooded with oil and here there was a problem when firing. When firing it surprised for a moment, then from the air filter began to spew fuel. After unscrewing the candle from the chamber it just poured. Carburetor during refurbishment I did not disassemble and did not turn anything on it, although I admit that it once caused problems and often at a standstill between mowing, as I forgot to turn off the tap, he was able to pour all the fuel from the tank into the oil. Now, from the carburetor and the chamber, the fuel gushes well. What could be the reason for this situation. Carburetor disassembled, uploading pics. I am also asking for instructions on how to regulate this system, because I used to shoot it a bit, but it did not work.
Yes, I think maybe how I turned / rotated the engine during the renovation, maybe the float hung?

kamilkawka wrote:

although I admit that once it caused problems and often at a standstill between mowing, when I forgot to turn off the tap, he was able to pour all the fuel from the tank into the oil

kamilkawka wrote:

Yes, I think maybe how I turned / rotated the engine during the renovation, maybe the float hung?

In this case and with such symptoms (it is not so much about "turning" but about the fact that it is "pouring" when the tap is open) it is the basis to check if the float and valve are tight and if the correct level of fuel is maintained in the carburetor.

How to check it? I admit that for me carburetor is always a hard topic. I'm afraid of him like fire.
How to adjust it now

Don't be afraid of the carburetor, you have a lot of information on the subject on the internet. Disassemble and check that there is no gasoline in the float and if there is a valve closing the fuel supply when the carburetor has the correct fuel level.
Have you set the timing correctly, i.e. to the right characters. Check (if necessary) that the engine has adequate compression.

I am looking for browsing, one thing that I noticed was that this leverage:

(Image)

I don't have any drawbar on my tractor, and on the net I found a photo that something is coming there. In this position, the air damper is fully open.



Timing set to characters, compression is made. The engine after the first turning on for a few seconds, then went out and the fuel was already pouring through the filter (when turning the starter) and on the pulled out candle flew from the combustion chamber even without turning the starter.

Added after 1 [minutes]:



And such a photo I found on the net with some incoming tendon which I do not have.

Added after 1 [hours] 19 [minutes]:

Okay, gentlemen, I cleaned the gas newspaper thoroughly, put it together and everything is OK, there is probably something stuck. The topic can be considered completed.