1. Находим папку ...\Counter-Strike Source Dedicated Server\cstrike\cfg\mani_server.cfg
2. Находим вот эти строчки: // ********************************************
// Module : High Ping kick
//
// Desc : The Reserve slot module configuration cvars
// ********************************************
// Enable disable high ping kicker (1 = on)
mani_high_ping_kick 1
// Set the ping at which you want players kicked
mani_high_ping_kick_ping_limit 250
// Number of samples and averaged before a decision is made to kick a player
// (1 sample is about 1.5 seconds)
mani_high_ping_kick_samples_required 20
// Message displayed in console when player is disconnected
mani_high_ping_kick_message "Your ping is too high"
3. Изменяем 250 на нужный Вам лимит!