Straight Up Slick 3/4 To 1 Inch Gas Engine Pulley Crank Shaft Sleeve Adapter Bore Reducer Bushing Sheave With Knockout Step Key For Predator Motors And Goat Go Kart Builds That Run Slick As A Whistle

Gas Engine Crank Shaft Reducer Bushing Sleeve Adapter
✔️ Bore adapter fits 3/4" shaft expands 1" with step key slot for engines

You adjust shaft mismatches instantly using this reducer sleeve adapter. The bushing enlarges a smaller crank to match larger pulleys, letting you change belt speeds or fix alignment issues on your gas engine. This handy upgrade works straight off the shelf for predator motors and goat go kart frames where exact bore matching matters.

✅ Inside diameter measures 3/4" for direct fit on standard 3/4 inch crank shafts with 3/16 inch keyway clearance
✅ Outside diameter grows to 1 inch to accept larger pulleys and gear boxes requiring higher belt grooves
✅ Sleeve spans about 3 inches in length providing ample surface area for secure mounting
✅ Integrated step key extends 2 inches long with a 1/4 inch slot to match enlarged shaft requirements

💡 What is the best way to adapt a gas engine crankshaft to accept a larger diameter pulley?
Using a shaft sleeve adapter bridges the gap between mismatched bore sizes while keeping torque transfer smooth.
- A reducer bushing expands the crank diameter so you can run heavier duty pulleys without modifying the engine block
- This shrink adapter sleeve locks onto the original shaft via the factory keyway for reliable power transmission
- Adding a step key ensures the larger sheave aligns perfectly over the extended portion of the sleeve assembly