When should I no longer see metal fragments in oil....?

[RadialFin]

Yeah it's odd alright. Weenie pipe on the thing...

 

[rkcarguy]

Might be the pipe on such a large track. I know my piston had a clean spot in the center when I ran a weenie pipe, plus the pipe got really hot no matter the jetting, both signs that is was too small for the application. We have an open pipe rule and all of us are running larger exhaust like the .880

 

[GeorgeHenry]

That's so true, about divorcing

Highly unlikely we'll buy a 206 to be honest. It's a great package for racing, (in fact I've referred people to faster motors) but we aren't racing here. For now the $260 clone is fitting it's purpose, something for my wife and I to play with at the local track just generally hang out and pound laps. We'll run it 'til it vents the block and put either the KF2 or FA on there.

If I bought a 206 I would imagine the conversation going like this..
Me "hey I bought a motor for your kart"
Wife "cool, how much?
Me "$500"
Wife "awesome! I'm so excited! how much faster is it"
Me "a little"
Wife "I'm divorcing you"
Me "thats understandable"

 

[RadialFin]

Wouldn't be the first time she's told me that this year.

 

[Kart43]

Radial fin you would see evidence of a piece broken off the piston large enough to do the damage shown.