hi all I'm new to all this outboard stuff and need some help. it's dt55 1985 I think. had some probs getting it running had the carbs ultarsonic cleaned and started first time so in the water it went for a test. warmed her up put it into gear and of down the river I went just on tick over great. then I started to open her up and lost drive. turned her off checked and all looked ok so I tryed again went great on tick over but lost drive again when I opened her. I had a look at a parts diagram and the only thing I can see it being is drive shaft gear or the sliding clutch. can any one help?