Jupiter-Z Ratio Gear (4 Speed)

Four Speeds. Five Ratios. Your Setup.

Engineered for the Yamaha Jupiter-Z gearbox, this 4-speed Ratio Gear set is precision-machined for consistent tooth engagement across all four gear positions. Available in five ratio configurations — A, B, C, D, and E — each offering a different gear spread to suit varying riding and tuning requirements. Each set includes both the main shaft and counter shaft for a complete, ready-to-fit gearbox replacement. Select the ratio configuration that matches your setup before ordering.

Ratio Specifications:

• A — 13×34T / 18×32T / 18×25T / 23×26T
• B — 13×36T / 18×32T / 18×25T / 23×26T
• C — 13×34T / 16×29T / 18×25T / 21×24T
• D — 13×34T / 18×32T / 21×29T / 21×24T
• E — 13×36T / 16×29T / 18×25T / 20×23T

🔹 Highlights

• Precision-Machined Gear Teeth — consistent tooth profile geometry for stable engagement across all four gear positions
• Five Ratio Configurations — A, B, C, D, E options to suit different gearbox tuning requirements
• Main Shaft and Counter Shaft Included — complete shaft set for full gearbox replacement
• Jupiter-Z Gearbox Fitment — dimensioned to match Yamaha Jupiter-Z gearbox specifications
• Complete Shaft Set — main shaft × 1 and counter shaft × 1 supplied as a matched pair

✔ Product Specifications

• Type: Ratio Gear (4 Speed)
• Ratio Options: A / B / C / D / E
• Fitment: Yamaha Jupiter-Z
• Focus: Gearbox rebuild / ratio change
• Package Includes: Main Shaft × 1, Counter Shaft × 1

🔧 Installation Notes

• Confirm ratio configuration matches your gearbox tuning requirement before ordering
• Inspect gearbox casing and bearings for wear before installation; replace if necessary
• Ensure correct gear engagement across all four positions before closing gearbox casing
• Gearbox disassembly and reassembly is recommended to be carried out by a technician with relevant experience

Power You Can Trust.