Ignitions and Electrical› Ignition Components
TwinPower
Twin Power 99-01 FLH With EFI Ignition Coil Black Replaces H-D 31639-99
SKU: T09O 210651
Description
This coil offers at least 20% more voltage than stock, contributing to improved starting and performance. It replaces Harley-Davidson OEM part number 31639-99 and features a black, late OEM-style molded case.
Fitment
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Specifications
| Brand | TwinPower |
| Part Number | T09O 210651 |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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