Mikuni 990-793-003-R-2 Needle Jet Series for Round Slide Carburetor - 166 VM38

The Mikuni 990-793-003-R-2 is a genuine OEM needle jet designed for 166 series VM38 round slide carburetors. This precision-machined brass component is a critical tuning element that controls fuel metering during the mid-range throttle position, typically affecting performance from 1/4 to 3/4 throttle opening.

Key Features:

• Genuine Mikuni OEM part, made in Japan
• 166 Series needle jet with R-2 size designation
• Precision brass construction for consistent fuel delivery
• Features series and size stamping for positive identification
• Compatible with VM38 round slide spigot mount carburetors

Needle jets are identified by an alphanumeric code where the inside diameter increases as the letter advances alphabetically and the number increases numerically. The R-2 designation provides specific fuel metering characteristics for precise carburetor tuning. When tuning your carburetor, selecting the correct needle jet size is essential for optimizing engine performance across the mid-range power band.