WALBRO WT-990 Carburetor

This Walbro WT-990 is a high efficiency carburetor which may be fitted without problems on any type of motor, (a must for tuned engines). The original carburetors can give bottom acceleration problems. Since the fuel supply is just below the venturi the air/fuel mixes very well. In this carburetor are both needles, (low and high), more separated from each other so that they do not affect each other so much. Due to the absence of a choke valve and axle 20% more air can goes through. Standard used on the Zenoah G240, G270 and G290.

When selecting a tuning version, i.e. with bearings and/or a RVS340 steel shaft, the carburetor is also tested under vacuum and optimally adjusted.

Throttle valve shaft options

• With brass throttle valve shaft, (standard)
• With ball-beared brass throttle valve shaft
• With Stainless steel 340 throttle valve shaft
• With ball-beared Stainless steel 340 throttle valve shaft, (recommended)

Default settings:

• Stationary screw: 2 turns
• Lower mixing screw (L) one and a quarter turn open
• Upper mixing screw (H) one and a quarter turn open

Specifications:

• Bore: Ø12,7 mm
• Venturi: Ø18,6 mm

Suitable for all engines in our program and similar types.