RDLN Racing 38mm High Flow Air Filter - 50-80cc Performance

Boost horsepower, sharpen throttle response, and deliver an aggressive intake growl to your small-displacement powerplant with the RDLN 38mm 45-Degree Racing Air Filter Assembly. Engineered as a high-flow performance upgrade for carbureted 50cc 2-stroke and 4-stroke scooters, this open-element intake replaces your restrictive factory plastic air box with a high-CFM pleated filtration element. Includes a removable smoke-tinted rain cover cap with mounting screw.

Key Features

• 45-Degree Elbow: Angled rubber mounting neck provides clearance around tight rear shock mounts and frame gussets on small scooter chassis.
• Removable Rain Cover: Smoke-tinted plastic cap prevents moisture and road spray from entering the intake during wet-weather riding.
• High-Flow Pleated Mesh Element: Conical pleated filtration element with chrome end cap maximizes surface area while reducing intake restriction vs. stock foam or paper filters.
• Worm-Gear Clamp: Reinforced rubber mounting collar with adjustable worm-gear hose clamp for an airtight, vibration-proof seal on the carburetor inlet.

Fitment Guide

Features a 38mm internal diameter mounting collar with an adjustable clamp that will expand or contract to fit 36mm–40mm carburetor intake bells. Built for the following 50cc carbureted scooters:

50cc 4-Stroke (4T) — GY6 / 139QMB Platform

• Honda Ruckus 50 (NPS50), Honda Metropolitan 50 (CHF50, carbureted years)
• KYMCO Agility 50, KYMCO Super 8 50 4T, SYM Mio 50
• TaoTao (ATM50-A1, Pony), Wolf Brand (RX-50, Islander), IceBear, Bintelli, Chicago Scooter Company (Go.), Lance, Peace Sports, Roketa, Jonway, Vitacci, X-Pro

50cc 2-Stroke (2T) — Minarelli / Dio / Sport Platforms

• Genuine Buddy 50, Genuine RoughHouse 50, E-Ton Beamer 50 / Beamer II / Matrix 50, Keeway Hurricane 50 / Matrix 50
• Honda Elite 50 (SR/S models 1994–2001), Kymco ZX 50, SYM DD50
• Yamaha Zuma 50 (pre-2012), Yamaha Vino 50 (2-stroke)

Note for GY6 125cc / 150cc owners: This 38mm intake generally will NOT fit stock 125cc or 150cc carburetors, which require a larger 42mm–43mm intake boot. Measure your carburetor throat outer diameter before ordering.

Technical Specifications

• Intake Boot Inner Diameter: 38mm (fits 36mm–40mm carburetor velocity stacks)
• Elbow Angle: 45 degrees
• Filter Dimensions: 5.0" L x 4.0" W x 4.0" H
• Filter Element: Pleated synthetic mesh with stainless support and chrome end cap
• Includes: Filter assembly, smoke-tinted rain cover cap, mounting screw, worm-gear clamp
• SKU: 1300-1112

Important — Re-Jetting Required: Switching from a stock airbox to an open high-flow filter significantly increases airflow. This will cause your engine to run lean. You must up-jet your carburetor's main jet — typically 5–10 sizes depending on elevation — to properly balance the fuel mixture after installation.

Performance upgrades are considered racing parts and are not covered under warranty. For off-road and closed-course competition use only. Not legal for use in California on pollution-controlled vehicles.

• 45° rubber elbow helps position the filter around nearby components
• Removable tinted rain cover helps deflect spray; not waterproof
• High-flow conical pleated synthetic mesh element with stainless support and chrome end cap
• 38 mm nominal collar with worm-gear clamp for compatible 36–40 mm carb air-inlet connections
• Aftermarket intake conversion for compatible 50–80cc scooter builds; re-jetting required

Brand: RDLN; Part number: 1300-1112; Manufacturer part number: HL42C86144; Collar ID: 38 mm nominal; Compatible carb air-inlet OD: 36–40 mm, verify fit; Elbow: 45°; Element: pleated synthetic mesh with stainless support; End cap: chrome finish; Includes: filter, tinted rain cover, mounting screw, worm-gear clamp; Country of origin: China; Re-jetting required; Off-road only; Performance upgrades not covered under warranty; Not legal in California on pollution-controlled vehicles

Conditional intake conversion fitment: Honda Ruckus NPS50, Metropolitan CHF50 2002–2009; Kymco Agility 50, Super 8 50 4T, ZX 50; SYM Mio 50, DD50; TaoTao ATM50-A1/Pony; Wolf RX-50/Islander; compatible IceBear, Bintelli, CSC Go, Lance, Peace Sports, Roketa, Jonway, Vitacci, X-Pro; Genuine Buddy 50/RoughHouse 50; E-Ton Beamer 50/Beamer II/Matrix 50; Keeway Hurricane 50/Matrix 50; Honda Elite 50 SR/S 1994–2001; Yamaha Zuma 50 2T pre-2012 and Vino 50 2T; verify 36–40 mm carb air-inlet OD, elbow orientation and clearance; not for stock GY6 125/150cc carbs needing 42–43 mm connections