Fuller Hotrods 4143 Stroker Crankshaft Yamaha 379cc +4mm Stroke

The Fuller Hotrods 4143 is a heavy-duty drop-in stroker crankshaft designed for Yamaha engines. This performance upgrade increases engine displacement to 379cc through a +4mm stroke, delivering enhanced power and torque without requiring expensive case machining, custom cam chains, or spacer plates.

Key Features:

• +4mm stroke increases displacement to 379cc
• Factory assembled and trued for precision performance
• Complete kit includes proven Hot Rods connecting rods, top end bearings, and crankshaft webs
• True drop-in installation—no case modifications required
• Heavy-duty construction for demanding performance applications
• Ready to install right out of the box

Installation Note: Must be used with Vertex Stroker piston 23616A (sold separately) for proper operation.

This stroker crankshaft is ideal for riders and builders looking to maximize performance from their Yamaha engine without the complexity and cost of extensive internal modifications. The bolt-in design makes it accessible for both professional builders and experienced enthusiasts.