System Testing - Largest Winning Trades

[Michael Harris <eagle_marketing@xxxxxxxxx>]

When backtesting a system, should you always eliminate
the largest winning trade... especially if it is very
large?  How about if one or two trades are responsible
for much of a system's profitability?

I'm testing a system across 200 securities and there
are often 1 or 2 highly profitable trades.

Thanks.

Mike