All Spi have an expansion bottle under the wing above the shock and you may find you need it in hot weather only. If dry you should check that the inlet pipe isn't blocked as they tend to fill up at the bottom with crud. To remove it there is a nut on the inner wing just beside the rad cap. They should be half full in normal use. You have to use a special rad cap ( double seal) or the expansion bottle won't work .
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Thanks for that, so would the overflow pipe from the rad lead to this?
And if only needed in hot weather is it worth putting back in place (electric fan on switch etc)