Hot Rods Stroker Crankshaft Assembly – Up to 403cc – Yamaha Banshee 350 (1987–2006) | H129
- Ships next business day
- 30-day hassle-free returns
- Call us: 541-668-7503
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✓ 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)
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📦 Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.
Need something by a specific date? Call us at 541-668-7503 before ordering and we will check stock and ETA on that exact part. We can often point you to an in-stock alternative from another distributor.
Questions? Contact us, we respond within 24 hours.
