Crankshaft Assembly

Restore OEM-smooth power delivery with a heavy-duty crank you can trust. The Hot Rods Crankshaft Assembly is factory assembled and trued to OEM specifications, delivering durability and consistent performance that meets or exceeds OEM standards. Supplied as a complete assembly, it’s designed to simplify your engine rebuild and get you back on the track or trail with confidence.

This crankshaft assembly solves common rebuild headaches by arriving ready for installation and built around proven Hot Rods components—helping reduce downtime and ensuring correct fit and clearance where it matters. And because it’s fully rebuildable with genuine Hot Rods rods and bearings (unless otherwise noted), it’s a smart long-term choice for riders who maintain their engines properly.

Key features:

• ✅ Sold complete with original proven Hot Rods connecting rod, crank webs and top-end bearing (unless otherwise noted)
• ✅ Factory assembled and trued to OEM specifications; meets or exceeds OEM performance and durability
• ✅ Complete assembly—ready for installation and future rebuilds

Benefits of use:

• 🔹 Less downtime: complete, pre-trued assembly speeds up rebuilds
• 🔹 Reliability you can feel: OEM-spec truing helps reduce vibration and improves smoothness
• 🔹 Long-term value: rebuildable construction supports repeated service cycles

Technical specifications (as provided):

• 📌 Brand: Hot Rods
• 📌 Vendor part number: 4021
• 📌 Application: 250 cc, 4-cycle
• 📌 Type: OEM Stroke
• 📌 Stroke length: 53.60 mm
• 📌 Material: 4140 steel (steel finish)
• 📌 Connecting rod side clearance: 0.25 mm – 0.60 mm
• 📌 Gear quality: DIN class 9 or higher

Why choose this product?

• ⭐ Heavy-duty materials and OEM-spec assembly for dependable engine performance
• ⭐ Proven Hot Rods rod/bearing platform (unless otherwise noted) for trusted rebuild quality
• ⭐ Rebuildable design—service it again with genuine Hot Rods components