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2Bros MCS LTD Company number 16176735 - Vat No. GB 508324506 - info@2bros-mx.com - Tel: 03301333748
The Hot Rods Heavy-Duty (+4mm Stroke) Crankshaft Assembly 4143 is a performance-oriented replacement for Yamaha YFM350R Raptor and YFM350X Warrior models. With a +4mm stroke, it increases displacement to 379cc, providing enhanced power and torque. This crankshaft is factory-assembled, trued, and ready for installation, ensuring precision and reliability. It requires the use of the Vertex Stroker piston (23616A) for proper compatibility.
Yamaha YFM350R Raptor (2004–2013):
Yamaha YFM350X Warrior (1987–2004):
Part Number: 56-208.HR.4mm