Hi, new to forum, searched elsewhere but my question is not 100% answered. 90's era Gold 2 stroke 10400 series 4.5hp commercial, one piece plastic card (as opposed to two piece with separate filter housing) tore this apart for the first time and need an initial setting for the governor vane spring. Other reading suggests with throttle on lowest speed the butterfly should just be able to hold itself open while sliding forward to full throttle the spring tension increases the hold open. ??