Topic: Size Matters

[Vintageguy]

Anyone know the correct size for fuel line for 1978 CB750F fuel line? Think it's 1/4 but not sure if it's mm's instead. Thanks.

[dusterdude]

I believe oe is 5mm,i use 1/4 inch on mine with no problems

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[Vintageguy]

Many thanks

[david 750f]

It’s 5.5mm. Get the OEM Honda fuel line. Fits better than the aftermarket fuel lines.
https://4into1.com/genuine-honda-black-fuel-line-5-5mm-by-the-foot/

[Progas]

He's right, 5.5 is the way to go!

[754]

 And it's not as fat as automotive line, and can run without clamps.
 Plus it looks right.

[PGF550F]

I use 3/16” automotive fuel line. Fits tight without clamps and it’s easy enough to find locally. It seems to hold up well to the ethanol in our fuel too.

Can never go wrong with Honda parts though.

[Vintageguy]

Used 1/4" hose and clamps. Not Honda but at least they're clamped and not cracked like what  it came with. Feel better about it but may go with genuine Honda 5.5 down the line. Also added a fuel filter, never a bad idea. Thanks.

[dusterdude]

I use 1/4 automotive hose with no clamps,nary a problem.

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[754]

I am using that yellow opague line on my bike, not sure of size, fits good, pulls off easy when warm out.
 Now that things cooled off it seems stiffer. I think Honda line stays more flexi..