This new cdi fits snug on the spark plug. It requires a normal threaded on spark plug lead. I put it on a brand new Helio 66cc motor with a high compression head. It works good. I’ve made other small improvements too like a homemade boost bottle made from a co2 bottle that came from a bike shop and a three pronged spark plug. I also installed a hub/sprocket adapter with 36 teeth. Before the improvements the bike was loud and topped out at 32mph. Now I’m shopping for disc brake conversions because the bike want to go past 39mph. I’m literally afraid of how fast the bike is now. My Speedo is calibrated to the millimeter. Anything faster than a modded 66cc motor should definitely be a motorcycle instead.

bike berry has great service and easy to shop online , and i should also mention great prices, thanks bike berry!

Worked well

Good part

Killer

What i needed

The old coil quit the day after the new one arrived it works great.

excellent service, not impressed with spark plug wire.

Big difference than stock.��

Seems legit Looks good same housing as stock but the improved wire and boot are 100% improvement! Blue/black wires could be heavier gage or at least shrink wrapped to preserve them pretty light, all in all recommend over stock and good price point if you do the math on converting your stock to stage 1

Stage1 cdi Made my order and received pretty quick! Def recommend the stage1 over the basic cdi as they seem to burn out quickly