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+2mm Stroker (30mm) Stuffed Crankshaft for CY & Zenoah PUM Watercooled Marine Engines
+2mm Stroker (30mm) Stuffed Crankshaft for CY & Zenoah PUM Watercooled Marine Engines
Stuffed +2mm (30mm total) stroke crankshaft for marine engines. Full-circle crankshaft with stuffing reduces case volume, increasing primary compression and increasing power.
Feel the additional power that can only be obtained by increasing the cc's of your engine. This crankshaft features a 30mm total stroke (up from the stock 28mm stroke on Zenoah marine engines). This crankshaft will increase the displacement of your Zenoah G231PUM engine to 24.1cc (up from 22.5cc) and the displacement of a Zenoah G260PUM to 27.2cc (up from 25.4cc).
Fits CY / Sikk Marine Motors if top end is modified/replaced to accommodate the +2mm crankshaft (
Part ca655 is a machined cylinder that will work). Also fits Zenoah G231PUM and G260PUM with minor crankcase modification - you will need to slightly carve out the cases under the crankshaft flyweights to allow for proper clearance, and machine the cylinder to accommodate the longer stroke. Installing this crankshaft has a significant performance gain for the Zenoah engines.
Chung Yang Part# 228-414332