What is the inner diameter of Xuanyi classic throttle pipe?

1.6 pipe with a displacement of 5 1 mm.

The throttle valve is usually located at the engine intake, behind the engine air filter and in front of the intake manifold. Throttle is the most important component in EFI automobile engine system. Its upper part is the air filter, and its lower part is the engine cylinder block, which is the throat of the automobile engine and connects the air filter and the cylinder block.