I was wrong then, it does need a new piston.
Well maybe not, cant really tell from the pictures. A good rub with some 600 wet dry and WD40 would see that piston come up OK. Theres no damage around the ring grooves.
They are readily available new. If your going to sell it as rebuilt it might as well have a new piston in it.
The very first Victa i rebuilt (for myself, had grass that needed urgent attention) the piston was a lot worse than that, run without oil, cleaned it up best i could with wet dry, honed it, new rings and it was still going strong 8 years later and i sold the mower for $140.
Have you put in new rings on that piston and got it running like that???
Only reason i ask is time related. Pull it apart, put it together, pull it apart, put it together.
Did you hone it before putting the new rings in?? If you didnt theres probably no point now.
Id say theres probably no point even opening it up again. If its running well it must be well.
Ive had the same, no air cleaner and an engine full of grass. makes a mess.
So far as the warranty goes. I give 3 months.
Warranty covers mowing grass, not rocks, bricks, concrete or water meters and the like.
If you do forget the oil in the fuel i can tell when you bring it back blown up.
I tell them, oil in the container first before the fuel. Always. And you will never forget.
You can check to be sure youve put oil in anytime uptill the point you put fuel in.
Put the Fuel in first, oil last and its oh so easy to forget. And you cant really check and be %100 accurate.
If ever in doubt put the fuel in the car and mix a fresh brew.
They only come back for silly little things, cover popped off the back of the carb. Tennant broke the spark plug lead using mower as a bulldozer, wheel fell off. Things like that.
The most common of all is water in the fuel tank. That will never be your fault.
Actaully the most common of all is leaving the fuel tap on and flooding the motor.