Scooterworks Racing Air Filter (38mm, 45 degree angle);
Scooterworks Racing Air Filter (38mm, 45 degree angle);
$38.80
10 in stock
*Note: Free shipping to U.S. mainland (excludes AK, HI, and territories)
Orders placed by 1pm EST on weekdays ship the same day.
Product Details
DESCRIPTION: Bump up the power and torque of your 139QMB and GY6 engine with ScootsUSA’ Racing Air Filter!Specifications:Universal fitIntake diameter: 38mmAir filter angle: 45 degreesIncludes removable rain cover/shieldCompatibility:139QMB-based 50cc / 80cc engines with the following engine codes:139QMA139QMB1P39QMB1P39QMA-2YN139QMBJJ1P39QMB139FMA-2BD1P39QMBBN139QMB147QMDOther QMA modelsOther QMB models157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:157QMJ161QMK152QMI1P61QMKYN1P57QMJ1P52FMI154FMIJJ157QMJ1P57QMJBN157QMJBN161QMK-AOther QMJ, QMK, and QMI modelsDon’t see your engine listed? If the engine code includes “QM” or “FM”, this product is compatible with your vehicle.About ScootsUSA:Since our beginning in 1989, ScootsUSA has become a major supplier of parts and accessories for vintage and modern scooters. We have everything you need, from wear-and-tear items like tires and oil filters to aftermarket parts from brands like Malossi , NCY, Prima, YSS, Dr. Pulley, and more.This product is intended for off-road use only.This product is not intended for use on public roads or land.This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.*Performance upgrades are considered racing parts and are not covered by warranty.
SPECIFICATIONS: Universal fitIntake diameter: 38mmAir filter angle: 45 degreesIncludes removable rain cover/shield
COMPATIBILITY: 139QMB-based 50cc / 80cc engines with the following engine codes:139QMA139QMB1P39QMB1P39QMA-2YN139QMBJJ1P39QMB139FMA-2BD1P39QMBBN139QMB147QMDOther QMA modelsOther QMB models157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:157QMJ161QMK152QMI1P61QMKYN1P57QMJ1P52FMI154FMIJJ157QMJ1P57QMJBN157QMJBN161QMK-AOther QMJ, QMK, and QMI modelsDon’t see your engine listed? If the engine code includes “QM” or “FM”, this product is compatible with your vehicle.About ScootsUSA:Since our beginning in 1989, ScootsUSA has become a major supplier of parts and accessories for vintage and modern scooters. We have everything you need, from wear-and-tear items like tires and oil filters to aftermarket parts from brands like Malossi , NCY, Prima, YSS, Dr. Pulley, and more.This product is intended for off-road use only.This product is not intended for use on public roads or land.This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.*Performance upgrades are considered racing parts and are not covered by warranty.
139QMB ENGINES: and GY6 engine with ScootsUSA’ Racing Air Filter!
157QMJ ENGINES: based 125cc / 150cc / 169cc engines with the following engine codes:157QMJ161QMK152QMI1P61QMKYN1P57QMJ1P52FMI154FMIJJ157QMJ1P57QMJBN157QMJBN161QMK-AOther QMJ, QMK, and QMI modelsDon’t see your engine listed? If the engine code includes “QM” or “FM”, this product is compatible with your vehicle.About ScootsUSA:Since our beginning in 1989, ScootsUSA has become a major supplier of parts and accessories for vintage and modern scooters. We have everything you need, from wear-and-tear items like tires and oil filters to aftermarket parts from brands like Malossi , NCY, Prima, YSS, Dr. Pulley, and more.This product is intended for off-road use only.This product is not intended for use on public roads or land.This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.*Performance upgrades are considered racing parts and are not covered by warranty.
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 50cc, 80cc, 125cc, 150cc, GY6
- Engine Code: 139QMB, 157QMJ
- Fitment Notes: Performance, Universal Fit
Fitment Guide: This compatibility information is based on manufacturer and supplier data. Listed models are common known applications and may not include every compatible scooter. If your scooter has multiple versions or production changes, confirm the correct match before ordering. Check photos, measurements, original part numbers, engine code, model, and related fitment information whenever possible.
Common Fitment Questions
Q: Will this fit a 139QMB engine?
A: This SKU is listed as compatible with 139QMB engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Is this for 50cc scooters?
A: This SKU is listed with 50cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 1 lbs |
|---|---|
| Dimensions | 5 × 4 × 4 in |
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.
