Mikael just a thought to your throttle cable/spring setup. The spring should be attached at the same spot as were the throttle cable pulls and as much as possible in a straight line with the cable direction. That would put the minimum strain/wear to your throttle blade shaft/bore. With your setup you get an aft-downward pull on the shaft it self. With the above mentioned suggestion there will be no forces/wear on the shaft/bore.
The OE spring design does not suffer from this dilemma as it reacts on the cable and not the carb.
Just a thought as I mentioned
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