Dirt Bike CDI Boxes

Frequently Asked Questions

• How do I choose between AC and DC CDI boxes for a dirt bike?

  Confirm your bike’s ignition type in the manual or with a quick voltage check—AC units run off the stator, DC units use the battery for a stronger low‑RPM spark and better cold starts; match the same type as your bike.
• Why do pin count and wiring color matching matter?

  CDIs aren’t universal—match the exact 4‑pin/5‑pin layout and wire colors to your harness to prevent damage and ensure proper timing; compare product photos and wiring diagrams before buying.
• Do engine size and 2‑stroke/4‑stroke matter when selecting a CDI?

  Yes—choose a unit built for your displacement range and stroke type because ignition curves and limits are tuned to those engines; mismatches can cause hard starts or weak top‑end.
• What CDI features suit trail riding vs. racing?

  Fixed‑curve replacements prioritize reliability for everyday trails, while digital/adjustable curves and raised rev limits support modified engines and track use—only pick performance maps if your build can safely rev higher.
• What should I look for for harsh terrain or wet weather, and any install tips?

  Select sealed, vibration‑resistant housings with weatherproof connectors for mud, rain, and rocky terrain; during install, route wiring away from heat, secure grounds, confirm pin order, then verify smooth idle and clean throttle response.