Hot Rods Stroker Crankshaft Assembly – Up to 403cc – Yamaha Banshee 350 (1987–2006) | H129
✓ Fits:
- 1987–2006 Yamaha Banshee 350 (YFZ350) — 2-Stroke
✓ Features:
- +4.00 mm stroker crankshaft — combined with +5.00 mm longer rods builds up to 403cc displacement
- CNC machined 4140 steel — dynamically balanced for the increased stroke
- Factory assembled and trued to OEM specifications
- Drop-in replacement — no case modification required
- Compatible with Cylinder Works Big Bore cylinders for maximum displacement gains
- Connecting rod side clearance: 0.45 mm – 0.85 mm
✓ What's Included:
- Stroker Crankshaft
- Connecting Rods (longer than OEM)
- Crankshaft Bearings
- Labyrinth Seal
- Vertex Long Rod Piston Kit — if piston bore size selected
⚠️ REQUIRES Vertex long rod pistons — will NOT work with stock pistons or domes. Select your bore size above to add the matching Vertex long rod piston kit. Main bearings not included. Not rebuildable — rods are shorter than OEM. Requires Vertex gasket kit when using OEM cylinder heads.
J-arm (1987–1990) | A-arm (1991–2006)
Ships fast from DuneGoonShop! 🤘
📦 Shipping Information
In-Stock Items:
- Most parts ship next business day
- Modquad parts: Monday–Thursday dispatch
Made-to-Order Items:
- Custom swingarms & A-arms: 2–4 weeks
- EVP exhaust systems: 2–4 weeks
- Sneakers: 1–2 weeks
Stock Guarantee: Items marked "In Stock" ship immediately. Made-to-order items are built fresh for you.
Questions? Contact us—we respond within 24 hours.
