theres a trick to getting that sleave off without screwing up the plastic collar, apply a little heat to soften the plastic and it will come right off.
drive shaft seals aren't too bad, take the bolts outof the carrier, use a blunt punch and rotate the carrier, once its broken loose it should come out, if not, position one of the holes over open space. a 3/8 16 ta p will theard the hole,, position the hole over part of the lower unit housing, run a bolt in to use as puller to lift the carrier. Remove the seal and replace. Note, both seals face the same direction on a Yamaha, unlike a Merc.
Trim seals can be pulled with a seal puller if they are the ones that dont have to have the end caps removed. A piece of pvc pipe cut square can be used to install the seals
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