Hi I have a Wizard lawn mower with a Briggs & Stratton engine that was ran with low oil I dont know much about engines but when I stripped it the piston arm has sheared at the end I can't see any other damage so my problem is I need to replace the piston but I cant see any no on the piston all I have is the engine model no 289707 type no 1179e code 9904

thebriggsdude

Thats what you need.... the numbers off the shroud....

If there was no damage to the block (and the cylinder walls are good???!!) and not scar'd..., the conrod might be just it, and your fine...

robc68fb

I did the same thing with my murray 12.5 hp (ran it low on oil)
Not trying to scare you or anything, but I busted a rod too, replaced the piston rings, replaced the counterweight connecting link (twice) & still had problems. I got so frustrated with trying to fix it, I went out & bought a used motor that (so far, so good) runs fine.

Even though I could see no major internal damage in the original motor, the block is all aluminum & I think the block became stressed or something. Every time I fixed something internal, I would get it back on the mower...start it, & try to engage the blades or something & something else would break. It would run fine until I put a load on it, like engaging the blades.
Hopefully, you won't have these sorts of problems with yours. Like I said, not trying to scare you or anything, but wanted you to be aware of what might be ahead of you. Best of luck with it.