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Hi Noelia.The big carb spring, with the little bit of rubber tube around it, must be in place first. If you loosen the little 8mm locking nuts holding the stabiliser springs, then you can screw the carb slides up and down. If you put a piece of wire under each slide, you will know they are even on each one when the slide touches the wire. Tighten the locking nuts.The stabiliser springs must be very straight and not bent. This will bench Synch them, hopefully enough to get the bike started. Then they can be vacuum synchronised when on the bike for final adjustment.Your carbs look great.Julie
Hi Noelia,I too had this problem when rebuilding my 400F carbs - it was 3 yrs ago & im scratching my head trying to remember the issue. Bottom line, I think I'd swapped two of the throttle sliders (L & R sets are different) .... and to make them 'fit' had to rotate them 180 degrees in the carb body. For this to happen, two had to be wrong.But you've got one... have you replaced a single throttle slider? Or have you managed to adjust its paired one so much that it now looks right? As I recall the bottom edges are different (slider) front & back... straight or concave... it any of your 4 are different you've certainly fitted them in a reverse position.Hope this helps, working from a very dim memory.Simon