Description
Fitment: 2017-2023 Harley M8 Motorcycles (Touring and Softail Models)
NOTE: WILL NOT FIT 2023/2024 CVO 121″ Models
Zipper’s 74mm Throttle Body System for 2017–2023 Harley-Davidson M8
The Zipper’s 74mm Throttle Body System is engineered for high-output Milwaukee-Eight engines that demand maximum airflow and crisp throttle response. Designed as a complete bolt-on upgrade, this system delivers the airflow needed to support large-displacement and high-performance M8 builds while maintaining OEM-level fit and reliability.
Ideal for competition-style engines and performance street builds, this oversized throttle body system replaces the restrictive factory components to unlock improved power potential at mid to high RPM.
🔥 Performance Benefits
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Increased airflow to support high-horsepower M8 engines
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Improved throttle response and top-end performance
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Optimized for large-port cylinder heads and big-inch builds
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Designed for engines where airflow is a limiting factor
⚙️ Features
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74mm Bosch throttle body for consistent, reliable performance
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CNC-machined billet aluminum intake manifold
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Oversize intake flanges for maximum airflow
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Plug-in wiring harness for clean, factory-style installation
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Includes all required mounting hardware
🏍️ Fitment
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Fits 2017–2023 Harley-Davidson Milwaukee-Eight models
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Compatible with Touring and Softail M8 platforms
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Not compatible with CVO 121″ models
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Intended for high-performance applications
Add High Flow Injectors to your Throttle body
Horsepower Inc High Flow Injectors are a direct drop-in replacement for Harley Davidson Motorcycles. These injectors feature a specifically engineered spray pattern that optimizes fuel atomization. These injectors have a fuel deliver rate of 6.2gps and are highly recommended for engines making or exceeding 110 horsepower.
Need to upgrade your air intake to match your new larger throttle body?
Cycle Solutions Inc offers several styles of motorcycle air intakes that have a backing plate specifically for a 58mm and larger throttle body. Our intakes have larger openings that match up perfectly to our large throttle bodies so that there is no air flow restrictions letting your throttle body breathe! Be sure to check out our air intake section when purchasing a larger throttle body.
