Stroker Crankshaft Yamaha — Selected Models; See Fitment

Stroker Crankshaft Factory assembled and trued to OEM specifications Drop in replacement crankshaft requires no modification unless noted CNC machined and dynamically balanced to suit the increased stroke Add +2.00 mm to +4.00 mm of stroke depending on application Uses stock piston unless noted Main bearings not included Can be matched with Cylinder Works Big Bore cylinders to get significant displacement and horsepower gains Not re-buildable as the rods are shorter than OEM. Connecting rod side clearance is 0.20 mm - 0.55 mm. When using Cylinder Works # 21001-K01 makes 500 cc. Final displacement determined by application. Uses stock piston. Does not fit fuel injected R or X models.

Supplier reference: 09210043
Manufacturer reference: 4173

UK standard delivery: 6–10 working days. In-stock parts dispatch within 2–3 working days.

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