SD Brand CDI Ignition
This module is a SD BenTeng brand manufactured CDI; Marked YD on underside and some are marked BT on the underside. SD is the oldest CDI manufacture but has experienced poor quality issues lately.
When you hear someone say stock CDI you must know what factory made the stock CDI because they are not made the same.
NOTE: You must use a SD CDI with a SD mfg. rotor and magneto coil to get correct timing.
To understand "why daddy" go to grubeeinc.com information side and read all about 2 stroke Ignition. It is very important that the 2 brands of CDI's do not get mixed up due to timing variances. WARNING: This is the biggest problem 2 strokes are now experiencing.
