old 5 wire servo Q
 

hey, i have an old mrc(tamiya) road winner 1/10 buggy that i want to run.
i had it since 89 and it stop running at 90, it run maybe 10 times.
i took out the oem board and im using wltoys receiver/ecs. the motor run nice and smooth but i have a problem with the oem servo.
the servo uses 5 wire and so the wltoys receiver. i menage to hook the wires in a why that it work but it work slow and under power, i think i missing something. any thoughts or ideas how to make the servo run?