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What size is the fuel line on CB400F2 / top engine breather pipe termination ?

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McCabe-Thiele (Ted):
After fitting the air box after a fashion I realise I should have connected the fuel pipe!
Old pipe is so deteriorated I can't get a decent diameter measurement.

What is the correct size/diameter I should fit please ?

The breather pipe from the top of the engine cam cover seems to just end under the seat should it be connected anywhere ?

Bryanj:
5.5mm for fuel pipe, dont know about breather

taysidedragon:
The engine breather hose goes down the back of the air box and connects to the cup thing underneath the air filter box.

McCabe-Thiele (Ted):

--- Quote from: taysidedragon on August 28, 2020, 10:45:22 AM ---The engine breather hose goes down the back of the air box and connects to the cup thing underneath the air filter box.

--- End quote ---

Thanks for that the cup thing on mine has been part painted black so I never spotted it there is the male pipe connector staring at me! My old hose is a straight piece with original looking clips so I guess the original was not moulded with any bends.

McCabe-Thiele (Ted):

--- Quote from: Bryanj on August 28, 2020, 10:15:19 AM ---5.5mm for fuel pipe, dont know about breather

--- End quote ---

Is that 5.5mm o/d presumably 3.0mm i/d any tips on whether it should be cotton braided or where to buy from please..

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