RDLN Racing Air Filter 38mm | 50cc - 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.

California Prop 65 Warning: www.p65warnings.ca.gov

• 45-degree rubber elbow clears tight rear shock mounts and frame gussets
• Removable smoke-tinted rain cover cap prevents moisture ingestion
• Conical pleated mesh element with chrome end cap for high-flow filtration
• 38mm rubber mounting collar with worm-gear clamp for airtight seal
• Fits 50cc 4T GY6 (139QMB) and 50cc 2T Minarelli/Dio platforms

Intake ID: 38mm | Clamp Range: 36–40mm carb intake bells | Elbow: 45° | Dimensions: 5" x 4" x 4" | Element: Pleated synthetic mesh + stainless support | Includes: Filter, rain cover, screw, clamp | SKU: 1300-1112

Brands: Amstar, Amigo, Ascend, Baotian, Bashan, Blade, Boom, Chicago Scooter Company, Dongfang, Roketa, Baotian, Bashan, BMS, Cool Sports, E Ton, Fly Wing, Eagle, Fly, Italica, Riya, Ice Bear, Jackel, Jet Moto, JCL, Taotao, Peace, JM Star, Jonway, Kazuma, Keeway, KMD, Kymco, Lance, Lifan, Linhai, Loncin, Longbo, Fuxin, Jiajue, Tao Tao, Tao Motors, Trailmaster, Maxtrade, Meitien, Motofino, Motorino, NST, Panterra, Panther, Qlink, Yiben, Red Streak, Redcat, Roketa, Schwinn, Strada, SYM, Tank, Terminator ,Tomberlin, TNG, United Motors, Vento, Vitacci, Wildfire, Wolf, X-Treme, X-Pro, Yongfu, ZNEN, Zhongneng , Zhilong, Geely, Wangye, ZH and more Manufactured by: Taizhou Zhongneng Motorcycle Co.; Jiangsu Zhongneng Motorcycle Co.; Jiangsu Meijunte Technology Co.; Taizhou Qianxin Vehicle Co.; Ningbo Dongfang Lingyun Vehicle Made Co.; Taizhou Zhilong Technology Co.; Zhejiang Jiajue Motorcycle Manufacturing Co.; Zhejiang Gelly Ming Industrial Co.; Taizhou City Senglong Motorcycle Manufacture Co.; Jiangsu Sacin Motorcycle Co.; Jiangsu Linhai Power Machinery Group Co.; Zheijiang TaoTao Vehicles Co.; Zhejiang Senling Motorcycle Co.; Sanmen County Yongfu Machine Co; Taizhou Jiaojiang Zhiwei Motorcycle Manufacture Co.; Huzhou Daixi Zhenhua Technology Trade Co.; Taizhou Zhongneng Motorcycle Co.; Zhejiang Riya Motorcycle Co.; Ningbo Longjia Motorcycle Co.; Taizhou Zhongneng Motorcycle Co.; and more