SOHC.co.uk Forums > CB500/550

What is the spring for?

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petersy:
On cleaning and replcacing the carbs on my 1974 CB550 four, one of them is overflowing and luckily it is the number 4 (end) carb, so I can remove the float bowl quite easily to check the float valve.

But I can't figure out the purpose of the small sprung needle in the centre of the needle valve.

Does anyone know please?

mike the bike:
It's to keep pressure on the needle valve into the seat to stop the petrol flowing.

petersy:
Wouldn't the floats keep pressure on the valve even if the spring wasn't incorporated in the needle i.e. just a plain fixed pin lodging on the float tab?

Bryanj:
Its so the pressure stays when the floats are bounced by the supersmooth roads

petersy:
Never thought of that - thanks for enlightening me.

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