Stage6

Intake spacer Naraku Jet Flow, GY6 139QMB/QMA

SKU: NK200.04
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Intake spacer Naraku Jet Flow, GY6 139QMB/QMA

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Description CNC-milled aluminium intake spacer from NARAKU. The NARAKU Jet Flow is specifically designed to optimize the intake flow for the 51mm NARAKU cylinder head. The spacer’s conical bore creates an unimpeded flow from the 24mm manifold into the 21mm manifold intake port of the NARAKU 51mm cylinder head (found in 51mm and 52.4mm cylinder kits from NARAKU). The Venturi effect accelerates the feed of fresh gas, which provides a better filling of the combustion chamber resulting in increased torque. After adjusting the original cylinder head or the intake, the spacer can also be used with the original set-up or tuning stages with kits below 90cc. Using a 24mm carburettor is highly recommended, but not obligatory. When mounting the spacer, please ensure that the connection between the intake and the cylinder head is kept clean and free of dirt and debris. The spacer may also be mounted reversed 180 degrees. In this case it covers a part of the inlet channel, though. Questions about the product

  • Brand: Naraku
  • SKU: NK200.04
  • Availability: In stock

Notes and Safety What is a reed valve spacer?The reed valve spacer is an aluminum component that is placed between the crankcase and the reed valve. It is often used on 50cc 2-stroke scooter and motorcycle engines.what is the function of a reed valve spacer?Adding a spacer under the reed valve increases the height of the block, thus increasing the volume available in the engine block. In addition, the spacer causes the boost ports of the cylinder to be flowed freely, which can improve gas flow and performance.It is important that the thickness of the spacer matches your engine setup. As a rule of thumb, the larger the displacement, the thicker the spacer. Since every engine is unique, you'll

Technical Specifications

SKU NK200.04
Warranty 12 months

Performance Features

CNC Machined

Precision-engineered components for perfect fitment and maximum performance.

Lightweight Design

Optimized weight reduction for improved acceleration and handling.

Racing Performance

Track-proven design delivering consistent power and reliability.

Increased Reliability

Premium materials ensure long-lasting durability under extreme conditions.

High RPM Stability

Engineered to maintain balance and performance at maximum RPM.

Improved Cooling

Advanced thermal management for consistent performance.

Fitment & Compatibility

Brand Model Engine Years
Piaggio Vespa S 2-Stroke 2008-2020
Piaggio Vespa LX 2-Stroke 2005-2015

Technical Data

Shipping & Delivery

🇵🇱
Poland
DPD 1–3 Days
🇪🇺
Europe
DPD 2–11 Days
🌍
Worldwide
DHL Express 2–8 Days

Installation Information

⚠️ Important

Professional installation recommended. Improper installation may void warranty and cause engine damage.

💡 Pro Tip

Always use proper torque specifications and break-in procedures for optimal performance and longevity.

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Frequently Asked Questions

Check the compatibility table above. If your model is listed, this part will fit. Contact us if you're unsure.
We recommend professional installation by a qualified mechanic. Proper tools and technical knowledge are required.
Yes! We ship to over 50 countries worldwide with DHL Express and DPD. Delivery times vary by location.
All parts come with manufacturer warranty. Check the specifications section for warranty details.