New Hot Rods Stroker Crankshaft for Yamaha YFM 350 X Warrior (89-04) 4143

excellent crank and company to deal with. only down side is you have to use vertex piston 23616A unless you know a machinist that can mill a piston from a 93-99 yamaha yfm400 kodiak

I already have the 366cc big bore top end kit already installed, would I still need machine work done ?