RE: OFFICIAL Redcat Racing TRUCK thread
TruckFreak, if your a senior in mechanics class, then you should know that that is normal wear and tear on the top of the piston and there's no need to polish it. It won't increase or decrease performance in the least. It's just the result of where the explosion takes place. The only thing you need to make sure of is that the sides of the piston and the cylinder wall aren't scratched. That's where you'll lose power. As long as you use a fuel filter, you should be in the clear, unless of course you drop a bunch of dirt in the top of the head while the glow plug is out... Doh!