PMR Performance Jack Shaft for 4-6.5hp engine’s Easy gear ratio adjustments, shown with 13t-15t #35 chain combo. Input and output Sprockets which can be easily switched from high torque 6.73-1 ratio to high speed 5.03 -1 ratio.
Jack shaft plate bolts to most any engine with the standard 2.5 inch engine PTO side cover bolt spacing.
This system has been tested on Karts and highly modified engines with 15- 20+ HP! Optional custom gearing available at your request!
- Jackshaft Plate Assembled
- Mounting Hardware
- Detailed Instructions