hELP WITH CHECKPOINTS

how i can do for change checkpoints size i changed in script but it dont change

new checkpoint[MAX_PLAYERS];
new check[MAX_PLAYERS];

COMMAND:startjob(playerid, params[])
{

checkpoint[playerid] = SetPlayerCheckpoint(playerid, -171.2656, 2025.1487, 16.4946, 2.0);
return 1;
}

public OnPlayerEnterCheckpoint(playerid)
{
if(job[playerid] == 1)
{

check[playerid] = SetPlayerCheckpoint(playerid, 2182.2268, 2453.1355, 10.1520, 8.0);
}
return 1;
}