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Please Note: The roller weights are greased from the factory and should be inspected before install to verify they are properly seated in the ramps
Units produced February 2022 and earlier
Worm-Gear Clamp: Reinforced rubber mounting collar with adjustable worm-gear hose clamp for an airtight
original rubber rings become stretched
Universal Parts QMB139 Cylinder Head - Emissions ES3 Please Note: The roller weightsUniversal Parts PAIR Style (Emissions) Cylinder Head for 50cc 4 stroke QMB139 engines. PAIR is an acronym for Pulsed Secondary Air Injection System. It is an emissions control system used to lower HC and CO emissions. It works by allowing air into the exhaust flow. 39mm Bore Intake Port Diameter: 17mm Exhaust Port Diameter: 18mm Emission Control System: Pulsed Secondary Air Injection System(PAIR) QMB139 50cc 49cc , Various unlisted makes models