Product Description
40a 3 Phase Charging System is available now from Knobtown Cycle, your Kansas City motorcycle parts specialists.
Key Features
- This system produces 25 AMP at idle with 40 AMP above 2800 rpm
- Fitments include Softail,Dyna and FLT with OEM primary due to the rotor and stators narrow profile
- The vented rotor helps with heat dissipation, keeping the stator cooler allowing for maximum output
- High output voltage regulator (14.25 V from idle)
- Made in the USA
Product Specifications
- Part Number: 139-10021
- Brand: Compufire
- Weight: 11 lbs
- UPC: 694342548056
Available at Knobtown Cycle
Order online or stop by our Kansas City location. Kansas City riders since 2004!
Part Locations
| Location |
Available |
| Ashley (IN) |
2 |
| Elizabethtown (PA) |
0 |
| Boise (ID) |
0 |
| Midway (GA) |
0 |
| Fresno (CA) |
0 |
| Jessup (MD) |
0 |
| Midlothian (VA) |
0 |
| National Total |
2 |
Stock levels last updated: March 1, 2026 5:07 PM
Professional Installation Available
Knobtown Cycle offers professional installation services. Contact us via a service request to learn more.
Thank you for Shopping at Knobtown Cycle!
When you shop with us, you’re not just buying motorcycle parts — you’re supporting a small, family-run business rooted right here in the heartland of America. Every order helps us keep riders on the road and fuels our passion for serving the motorcycle community.
From all of us at Knobtown Cycle, thank you for choosing local and riding with us.
Reviews
There are no reviews yet.