Koso North America Brass Air Screw – Honda Grom & Monkey Throttle Body Tuning (OG, SF, JC92)

Koso North America Brass Air Screw for Honda Grom and Monkey throttle bodies — a precision CNC-machined upgrade over the stock plastic air screw for more accurate fuel-air mixture adjustment and long-term durability. An essential tuning component for any Grom or Monkey build running aftermarket intake, exhaust, or ECU modifications.

Why Upgrade the Air Screw?

The OEM plastic air screw is prone to wear and imprecise adjustment. Swapping to a brass unit gives you finer control over your fuel-air mixture, better corrosion resistance, and a component that holds its setting under heat and vibration — critical for dialed-in throttle response on modified engines.

Key Features

• CNC-machined high-precision brass construction
• Superior durability and corrosion resistance vs. stock plastic
• Precise fuel-air mixture adjustment for optimal tuning
• Direct OEM replacement — no modifications required
• Easy installation: direct swap with stock air screw

Specifications

• SKU: BS000010
• Weight: 0.1 lbs
• Vendor: Koso North America
• Google Product Category: 899 (Vehicle Parts & Accessories > Engine Parts)
• Price: $11.95

Fitment

• Honda Grom — OG (2014–2015), SF (2017–2020), JC92 (2022+)
• Honda Monkey 125 — 1st Gen, 2022+
• Honda Monkey 125 — 2019–2021