Shin Yea Performance Intake Manifold - 4 Valve Cygnus for Scooters & Mopeds
ITEM# TT-16409
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Description
Shin Yea Performance Intake Manifold for GY6 Engines
This Shin Yea performance intake manifold is built for GY6 engines that use Cygnus-style four-valve heads, covering QMJ and QMI 152/157 models. It suits both fuel delivery setups, so tuners and hobbyists can use it in more than one build. It is one of the scooter cylinder heads & valves options aimed at improving engine output through better airflow. A head gasket comes in the box so you have what you need to complete the install.
Build Material and Fit Details
The manifold is die-cast aluminum, giving it a sturdy path for air to reach the engine. A red silicone boot on the carburetor end is held in place by two stainless hose clamps for a snug seal. A dual-hole mounting flange secures the piece to the engine.
Fitting Notes
This manifold is made only for Cygnus-style four-valve heads and will not work with standard GY6 cylinder heads. Most installations will also call for an intake spacer. A vacuum port with a plug and brass fitting is included, and it is needed for carbureted setups.
Specifications
- Bolt hole spacing: 50mm
- Carb-side bore (ID): 35mm
- Engine-side bore (ID): 32mm
- Vacuum points: 1
- Carb compatibility: CVK 24–30mm, PWK up to 30mm
- Includes: head gasket, vacuum plug with brass fitting
- Made in: Taiwan
- Fits: GY6-based engines with Cygnus-style 4-valve heads (QMJ/QMI 152/157)
Fitment
Fits:
- GY6 QMJ/QMI 152/157 engine with Cygnus-style 4V head (not standard GY6 heads)
How to choose: Confirm your head is the Cygnus-style 4-valve design, since this manifold will not fit standard GY6 heads. Most builds will also need a separate intake spacer.
Shop more: Scooter Cylinder Heads & Valves · Scooter Fuel System Parts · Scooter Parts
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