MIKUNI Needle Jet VM38/41-R-4

Fine-tuning your carburetor's mid-range performance requires precision, and the MIKUNI Needle Jet VM38/41-R-4 delivers exactly that. This genuine Mikuni component gives you direct control over fuel delivery during the critical 1/4 to 3/4 throttle range—where most street and track driving happens. By selecting the correct needle jet size for your jetting setup, you'll achieve the optimal air-fuel ratio for your specific engine configuration and riding conditions.

Genuine Mikuni needle jets are engineered in Japan with strict tolerances and include factory stamping for easy identification. Whether you're dialing in a stock rebuild or optimizing a modified carb stack, this needle jet is an essential tuning tool that works alongside your needle position and main jet selection.

• Genuine Mikuni manufacture
• VM38/41 series fitment
• Size code: R-4
• Mid-range jetting control
• Inside diameter increases alphabetically/numerically
• Factory series and size stamping
• Tuning range: 1/4–3/4 throttle
• Made in Japan
• Bolt-on installation