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18hpevinrude fasttwin headed in fom fishing about half throttle and it was like motor went in to neutral backed off throttle started going again it didnt happen any more. Anybody got any idea what caused this or what type of repair may be needed ?
If it is slipping at high throttle settings but ok at slow speed, chances are over 90% the prop hub is slipping. However if it was only a temporary thing and now pushes at high speed without slipping, it probably was cavitating from picking up a weed or something on the prop.
If you pick up weeds a lot, stop, put in reverse and give a little throttle. Then shift back to foreward. This usually throws off the weeds, unless they are really snarled.
To check for spun hub, remove the prop, mark a line accross the back side, reinstall. Go for a ride, and check the prop when you get home. If the lines don't match up, you have a spun hub. Repairable at the local prop shop.