Compatible with all ANIMA 4-Valve, 4-speed engines (150F/160F/190F/190S/212)

• Designed for Circuit Racing. Launch out of corners faster than ever.  

• Shift through the gears while staying in the ideal power band—perfect for serious track riders chasing better lap times.

• Engineered to keep the engine in the optimal power band (8,500–10,000 rpm). Final ratio is the same as the original 4-speed transmission.

• Compatible only with 4-speed engines. Not suitable for 5-speed engines due to crankcase width differences.

For riders seeking higher top speed, we recommend pairing with PN#81399 : OVERDRIVE PRIMARY GEAR KIT (65-19T)

Gear Ratios #81388 vs (Original) 1st ---15/32 (13/34) 2nd---19/28 (15/26) 3rd ---21/25 (20/26) 4th ---23/24 (23/24)