JOG 50 Long Stroke Bakelite Crankshaft 41.4mm(+2.2mm)
Faster primary compression. Longer-stroke torque. OEM-fit assembly.
This Bakelite Crankshaft for Yamaha JOG 50 pairs Bakelite (phenolic) inserts with a 41.4 mm (+2.2) long stroke. The inserts reduce crankcase dead volume to sharpen primary compression, while the added stroke increases displacement potential for stronger low-to-mid pull—once cylinder height, timing, and fueling are set correctly. Precision journals and OEM-matched tapers keep assembly straight and predictable.
Highlights
🔹 +2.2 mm Long Stroke — 41.4 mm stroke broadens torque potential after proper top-end setup.
🔹 Primary-Compression Boost — Bakelite stuffers trim case volume for quicker pressure rise off the line.
🔹 Cleaner Case Flow — Web shaping guides mixture more directly toward the transfers.
🔹 Precision Interfaces — Tapers/threads/keyway match OEM bearings and ignition hardware.
🔹 Build-Ready — Designed for straightforward truing, seal fit, and clearance checks.
Product Specifications
✔ Type: Bakelite-stuffed long-stroke crankshaft
✔ Stroke: 41.4 mm (+2.2)
✔ Fitment: Yamaha JOG 50 (confirm year/engine code)
✔ Interfaces: OEM-match main-shaft tapers, threads & keyway
✔ Bearings/Seals: Compatible with OEM-spec main bearings & oil seals
✔ Material: Forged steel webs & connecting rod, Bakelite inserts
✔ Package Includes: Crankshaft assembly ×1
Installation Notes
Set cylinder height/base spacer, compression ratio, and squish clearance for the +2.2 stroke.
Re-evaluate port timing, ignition advance, and fueling/jetting for the longer stroke and higher case pressure.
Confirm small-end pin diameter and bearing spec match your piston/rod kit.
Check crankcase/web clearances, measure runout after bearing install, use new seals, and complete a careful break-in.
Power You Can Trust.