1995/ 225/ Johnson ocean runners. regular service by mechanic, water pumps thermostats, new lower unit seals. ? ..After running motors I have a sticky gunk stuff at exhaust seam between upper and lower unit. Is this normal after a service.? Ran her twice over the weekend 35 mi out and back. I never saw this before on the motors. Seems to be running a little hot at 3500 rpm's-190-200*. My mech after 2,500 bucks says this is normal for a spell. 550hrs on each.