SSP-G Crankshaft 44mm 16T Performance Stroker (139QMB)
Description: SSP-G Crankshaft 44mm Performance Stroker 16-Teeth (139QMB) increases standard stroke by 2.6mm-more displacement equals more power! When used in conjunction with a 52.4mm cylinder big bore, total displacement cranks out at a whopping 94.9cc!
The crank is pre-pressed with main bearings and rod. 139QMB engines are factory-fitted with 2 different versions of the crankshaft. The only difference is the oil pump drive cog on the right-hand side (flywheel shaft). The old version, installed in almost all scooters, has a 16-teeth oil pump drive cog on the flywheel shaft. The new version has a 22-teeth oil pump cog on the flywheel shaft.
NOTE: This crankshaft has the 16-teeth oil pump drive cog on the flywheel shaft. Please compare replace the crankshaft before ordering, count the number of teeth on your existing 139QMB crankshaft oil pump drive cog, and reference the 2nd image above.
Include the following Crankshaft stroker.
• Base Stroke: 41.4mm +2.6mm
• Overall Stroke: 44mm
• Overall Length: 247mm
• Piston Wrist Pin Slot ID: 13mm
• Flywheel Shaft Thread: M10
• Oil Pump Cog Teeth: 16
• Flywheel Shaft Bearing OD: 42mm
• Variator Shaft Thread: M12
• Variator Shaft Splines: 26
• Variator Shaft Bearing OD: 47mm
• Fit QMB 49/50cc+ BORE
Supported Models: GY6 139QMB 49cc-50cc engines, Filly 50, Kymco, QLink, SYM
Item Weight & Product Dimensions:
• 4.41 pounds | 9.724” (L) x 3.5” (W) x 3.5” (H)