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I'm not certain what you mean by "manifold". Manifolds are generally ducts. Your bike has two manifolds:
1) Intake manifold: the plastic tube that connects the carburetor to the engine. The connection location on the engine is called the intake port. This is where the air/fuel mixture enters the combustion chamber.
2) Exhaust manifold. Also called the header pipe, is the tube that connects the engine exhaust port to the muffler.
The part you are referring to is the dashboard gauge cluster.
It is unwise to operate your 139 without a muffler. Ths can damage your exhaust valve.
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2011 Roketa MC-23-150
4T 150cc 157 qmj
24mm carb w 115 main jet and paper cone air filter
Manual petcock w Tygon fuel lines
Scrappy Dog Scooters Retro-slash stainless straight-thru exhaust
RED spring clutch
Adjustable CDI (brand unknown, it's blue and red and works great!)
KOSO high performance variator w 12g sliders
Gates Powerlink 835-20-30 belt
GPS verified 65mph on flats.
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