500 fuel pipe too long ?

[Peterplank]

Carbs fully rebuilt inc new fuel pipes, pleased to say bike started and running nicely.. I did 10 miles and it started to feel lumpy like running out of fuel and just about running..
When I got home and had a look around I noticed one of the fuel pipes looking a bit flat on the bend under fuel tap.
Could it be that pipe ok and staying round when cold but when everything heated up pipe can flatten and starve of fuel if an it's inch or so too long ?
Cut a bit off and started fine but can't try it till tomorrow...
does anyone have experience of this ?
Obvs hope so as a simple fix
)

[Bryanj]

What fuel pipe are you using?

[McCabe-Thiele (Ted)]

I think the pipes should be 180 mm & 300 mm long .

[Peterplank]

Using smooth nitrile fuel pipe, not reinforced..
I did cut to 300 and 180 but was too long.

[Johnny4428]

I had a similar problem with my 750, ended up putting a spring over the pipe to smooth the bend out and stop it kinking. Always thought the design of these taps in relation to their position was wrong. Horizontal outlets would work much better.

[McCabe-Thiele (Ted)]

Using smooth nitrile fuel pipe, not reinforced..
I did cut to 300 and 180 but was too long.

My pipe is reinforced, I used the Gates pipe as that was the brand fitted by Gerben or PO.
I tried a smooth Nitrile pipe, it seemed to go very soft quickly, as I had to take the Carbs off again I replaced the pipe.

When fitting the Gates Pipe lengths changed as I fitted dual in line alloy filters, they are virtually hidden by routing under the carbs.