The Lightning Bolt  High Performance CDI has a 30% stronger spark than the original HD Lightnihg CDI, giving you better spark for longer durations of time. Unlike the Lightning CDI, which advances timing up to a higher RPM range then starts to back off, the Lightning Bolt continues to advance timing through all RMA ranges. This continued advancement means that it is only suitable for highly advanced race engines capable of running at sustained high RPM’s. HuffyDavidson's CDI’s are, hands down, the best CDI’s on the market. They’re reliable, they correct timing, produces a stronger spark, and is made right here in the United States! ** Use of an HD Lightning Bolt CDI on a stock or lightly modified engine is not going to product much (if any) improvement over using the original Lightning CDI. It will not harm your engine, though. But the more advanced your engine is, the more of a performance gain you’ll see with the new Lightning Bolt IMPROVES up to 30% MORE than the Lightning CDI in:  MPGTOP END POWERMID RANGE POWERLOW END POWERIDLESTARTINGRELIABILITY  INCLUDES: Key lock Heavy Duty coil supply wires CDI Sealed for complete weather resistance Heavy duty, high performance stand alone coil
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