Question for KA experts

[TX240SX]

I just pulled the pistons from a 91 ka24de I just bought. They have a 05 stamped in the top. Are they stock or oversized? Thanks for the help.

[RBS14]

maybe they're out there but i've never seen an aftermarket piston with anything on the top of one.

[240racer]

Usually pistons only have one marking on the top and that's to show the front. I haven't seen any markings on the top of my pistons yet. Do you have reason to believe that it's not the factory build?

[Muzzy]

is the piston made of 2 different types of metal or just one?

[TX240SX]

Thanks for your replies and help. I received this email yesterday to let me know my pistons are stock:

Hi I'm very sorry it took me so long, but I was out cutting lawns today. I have checked and they all have 05 on them but it actually looks like this: where (_) is a circle in the middle of the piston.


:Front of engine: 3 2 2 2 :back of engine:
(_) (_) (_) (_)
05 05 05 05

It is kind of like a circle indentation in the middle of the piston and then on top were the single digit numbers and then on bottom were 05. I wonder why the first piston is 3 and the rest are 2. I hope this helped you out.

Hopefully this info will help someone in the future.