Thunder Shift Primary Rollers – Yamaha

Description

• Tuning component for stock clutches or when using Heavy Hitter Arms.
• Hardened steel rollers are bushed and ISR stock legal.
• Two sizes offers tuning for all models.
• Smaller size increases force of cam arms, larger size decreases force.
• More economical than helixes with more consistent results.
• Melonite coated for lubricity.
• Fits all late model Yamahas with 9mm pins (SRX, Viper, Venom, Rage, RX-1, Warrior, Vector, Mtn models, and newer models).

Sold in sets of three