NR Racing Carburetor, Stock Appearing (SA) Extreme, Stage 4,

Approved for Funkart F4 Classes.

NR Racing Specs:

 Extensively modified, stock-appearing carburetor that produces the most HP possible utilizing a stock carb body.

• In addition to having the largest Venturi area of any of our other bored carbs, the butterfly size has been significantly increased to provide 60% more airflow than a stock carb. Fuel circuits and jets have been reworked to maintain proper mixture.
• Similar to our Stage 3, but has additional work on inlet side (hand-worked for ~10% more flow)
• May have internal or external epoxy
• No choke
• All Stage 4 carbs are dyno-tested before shipping. Dyno testing shows these carbs to produce up to 1.0+ HP more than the standard bored (stock butterfly) and over 2+ HP more than a stock carb with only marginal loss in low-end and idle quality.
• Venturi is CNC milled and is oval shaped to maximize volume and velocity. Equivalent bore size (area) is greater than a .670" bore