[Darren Boyle]

A 667 piston is a black piston with two holes enlarged to the same size as a red piston.

When a three digit number appears with referance to a Losi piston, each number represents one of the three holes in the piston. The drill size holes for the different pistons are all as follows, the smaller the number the larger the hole;

Blue - 54
Orange - 55
Red - 56
Black - 57
Natural - 60

Since the natural is the smallest this often gets used for "drilling" into, but in all cases the last digit of the drill sizing is the number used to reference the hole sizes, hence a hole the same size as that found on a "red" piston is reffered to as a "6" (from 56) for example.

That is why a 556 for instance would be two "orange" holes and one "red" hole, a "drilled pink" will be a red psiton (they are a very light red, almost pink in colour, some people call them pink) will simply be a red piston with one or two hioles drilled bigger to either blue (54) or orange (55), juts depends "what" it has been drilled to....

Hope that helps......