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HIF jets compensate for ambient temperature by sliding up an down on their own.
My experience is that they work quite well. I prefer them over HS6 carbs.
You may be able to get away with simply cleaning the ones you have now.
In any event, pull the carbs apart and give them a good cleaning and since you have a repair kit, change the parts while you're in there. It is not difficult.
Do make sure however, that after you replace the parts that the adjustment screw will raise the jet just above the bridge and moves smoothly - both the screw adjustment and the jet itself. If you cannont get the jet to raise above the bridge, you may have to bend the tab that the bi-metal piece is attached to.
It will make more sense after the thing is apart and you can see how things work in there. The beauty of SU carbs is that they are very simple and easy to work on.
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'60 PV544, '68 220, '70 145, '86 745T
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