Yamaha 90 lower casing/gearbox
Hi, if I recollect correctly there area total of 6 bolts retaining the gearcase. 2 each side of the casing, (14mm af). One 12mm af retaining the trim tab/anode and one 12mm or 14mm af in the forward void above the trim anode going up into the exhaust leg. If all 6 bolts are free, it is possible three more problems have evolved. One, the gearshifter spline coupling has seized not allowing the box to drop. Two, the copper water cooling feed pipe in the top of the water pump plastic case has seized or salted up preventing the box to drop. Three, (worst), the spline drive at the top of the gearbox input shaft has seized into the female drive in the lower end of the crankshaft. If the third option has occured, it will be as difficult to remove the powerhead as it is to remove the gearcase. Hope this helps and good luck.