The Lightning CDI for the Grubee / China Gas engines is nothing more than a cheap copy of the Jaguar CDI but with no decent retard curve and no timing curve options. And the creator of it is a total sleezebag ("huffydavidson" on motoredbikes forum). When he introduced his CDI copy on the motoredbikes forum he pulled every dirty trick out of the bag in order to try to downgrade my Jaguar CDI and make his look better. He insulted me and criticized every little thing he could. He revealed how ignorant he was of two stroke technology when he said that having a timing curve is unnecessary. The Lightning CDI has little or no timing curve which means its just like the stock CDI (with too much spark advance at high RPM) but with a stronger spark. Put that on an engine with high compression and you are almost guaranteed detonation which destroys pistons. Also the engine can overheat and warp the head. And it also wears out the conrod bearings too fast. Here is a comparison graph I made after evaluating the timing curve that the Lightning CDI produces:
 Below are some timing graphs of various two strokes to prove that an advance/retard curve is standard for two strokes. ("advanced" means more degrees BTDC. "retarded" means less degrees BTDC.)  Look at the "full throttle" part of the RM250 curve below since motorized bicycles are always full throttle at high RPM.  Most CDIs bring the timing to around 10 degrees BTDC at peak RPM but the PVL below brings it around 0 degrees, probably in an attempt to get as much over-rev as possible.   |