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Splined inner diameter (valley to valley): 20mm
'63 - '83) Vespa 50 Special (V5B
and 170cc engines
but if you lose yours
Upper Mount Eye: 10mm
Exhaust; CSC go., 139QMB Scooters clip Splined inner diameter (valley toOEM complete exhaust assembly (including heat shield) for Chicago Scooter Company go, go MAX, Pug 50, Nitro Sport 50, Bella Classic 50 and sport style 50cc 139QMB bikes. Does not include SAI. Specifications: OEM replacement Black Includes heat shield Overall dimensions: 25"L x 8"W x 6. 5"H Compatibility: CSC Bella Classic 50 CSC Nitro Sport 50 CSC Pug 50 CSC go CSC go MAX 139QMB based 50cc 80cc engines with the following engine codes: 139QMA 139QMB
