Changed my gear oil this morning and then fitted a new Yam 703 control box. All went sweet. Boats in the front garden with the transom facing my neighbours house. Filled the tank full of water, took around half hour to fill. Lowered the engine in. Turns the key and the engine banged straight into life and when to full throttle

and in gear. I've fecked something up there, what I don't know as I just did a straight swap! Trouble is at WOT the engine had emptied 90% of the water out of the flush tank and kindly deposited it all over the front of my neighbours house, from roof to garden wall. Kinda cool

But he doesn't think so. That's him on the war path! I'm in trouble!
So, why is it staying in gear? I did notice before I swapped the controls that the prop seemed to turn to much at tick over. So maybe it's nothing I've done today to change that part. I must have upset the cable setup for the revs when I attached the cables to the new control.
I tried to turn the prop by hand earlier and found very stiff and I thought it seemed in gear. That was before I changed the controls.
Any help greatly apreciated!