Hi All,
There is no clutch in the outboard's lower unit. As shown in the photo Joe posted shifting is accomplished by moving a "shift dog" (in the middle between the gears) into and out of engagement with spinning forward or reverse gear. There are teeth (lugs) on each end of the shift dog that engage lugs on the inside of the gears. When you move the shift lever you're sliding the shift dog into position. If you go slowly and get a tick, tick, tick or grinding what you're hearing is the oppossing tips of the lugs hitting each other (that is the lugs on the shift dog tipping the lugs on the spinning gear). That's not good. What you want is a satisfying "clunk" (or nothing), just move the lever without hesitation from neutral to forward (or reverse) so that the lugs on the shift dog and those on the gears engage fully all at once; they're designd to take that load.
You will not damage anything by shifting an engine that isn't running UNLESS...the lugs on the shift dog and those on the inside of the forward or reverse gear are exaclty lined up. Then the shift dog can not slide into position. When this happens the shift lever moves normally for about 1/2 its normal engagement swing then stops; pushing beyond this point only serves to damage the control cable and/or the remote controller (it would be all but impossble to damage the lower unit). So, if your engine isn't running and you're able to shift with only normal resistance it's fine; if you get part way through the shift and it seems to "bind"...stop! Go back and turn the prop by hand a bit to move the lugs out of alignment.
Sorry to hijack the clay pigeon discussion! :lol: