What issues does this recalibration kit address?

This kit is designed to fix common problems found in CV carburetors, such as throttle flat spots, backfiring, and generally poor throttle response. It helps to restore a smoother and more consistent performance.

What sizes of main jets are included in the kit?

The kit includes a selection of main jets to allow for precise tuning. You'll find jets in sizes 150, 160, 170, 180, and 190 included in the package.

Does this kit come with instructions?

Yes, the kit includes instructions to guide you through the installation and tuning process. This helps ensure you can properly set up the carburetor for optimal performance.

Twin Power 90-06 Big Twin and XL with CV Carb CV Carburetor Recalibration Kit

Specifications

Brand: TwinPower
Part #: 420400
UPC: 887337164694

Twin Power 90-06 Big Twin and XL with CV Carb CV Carburetor Recalibration Kit

Name: Twin Power 90-06 Big Twin and XL with CV Carb CV Carburetor Recalibration Kit
Brand: TwinPower
Price: 96.24 USD
Availability: InStock

$96.24

On Backorder — Expected to ship by Apr 15, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Twin Power CV Carb Recalibration Kit for 90-06 Big Twin & XL. Fixes flat spots and improves throttle response.

Key Features

Fits 1990-2006 Harley-Davidson Big Twin and XL models with CV carburetors.
Helps cure throttle flat spots, backfiring, and poor throttle response.
Increases midrange and top-end power while maintaining satisfactory fuel economy.
Includes a main jet assortment for precision tuning: 150, 160, 170, 180, and 190.
Comes with installation and tuning instructions.

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Will this fit your vehicle?

Product Details

Twin Power is known for making well-built parts for Harley-Davidson motorcycles. If you're working on a Big Twin or XL model from 1990-2006 that uses a CV carburetor, this recalibration kit is designed to help you get the best performance out of it. Carburetors can sometimes develop issues like throttle flat spots, backfiring, or just a general lack of responsiveness, especially as they age or if you've made other engine modifications. This kit aims to solve those common problems.

By providing a selection of main jets – including sizes 150, 160, 170, 180, and 190 – this kit allows for precise tuning to match your specific engine setup. This means you can achieve improved power in the midrange and top end of your RPM range, all while aiming to keep your fuel economy satisfactory. The kit comes with instructions to help guide you through the installation and tuning process, making it a solid option for getting your CV carb running right.