I just replaced the lower unit on my 93 Johnson 150 faststrike. Everything went well and I put it on the muffs just to make sure it runs, pumps water, and shifts. First thing I noticed when I started was the RPM's jumped up to around 2000 and were erratic, bouncing from 1000 to 2000 or so. It seemed to settle down quickly and I left it running for a bit, shifted once or twice, and headed to the lake. Water stream was strong. The lu was used but had low hours due to a powerhead blowing. Water pump only had about 3 months on it so I left it alone. I previously decarbed and put new plugs and it was running strong.
Out to the lake and it ran well. A couple of times at start up it would jump to 2000 or so for a minute and then settle down to around 800. I seemed to have good power. On my way back to the ramp, I noticed it was running at a higher rpm than it generally does for cruising speed (maybe 30 mph but creeping to 4000 rpm's where I'm usually at 45+). I gave it a bit more throttle and it was making a sound like the prop was loosing bite. Very subtle "spinning" sound. Shut it down, sat, stated back up and same thing. I thought my prop was spun, but I've been searching posts and think it could be timing? Ignition? When starting, sometimes it goes right to 800 idle other times it jumps higher and bounces.
When the lu blew, it broke the drive shaft at the pinioin bearing and spun up to very high rpms before I shut down immediately. Checked compression and it's good at 90 all around. New lu went back up fine. I did have my wife rotate the crank clockwise so the splines would align. Any thoughts on what I'm dealing with?
Out to the lake and it ran well. A couple of times at start up it would jump to 2000 or so for a minute and then settle down to around 800. I seemed to have good power. On my way back to the ramp, I noticed it was running at a higher rpm than it generally does for cruising speed (maybe 30 mph but creeping to 4000 rpm's where I'm usually at 45+). I gave it a bit more throttle and it was making a sound like the prop was loosing bite. Very subtle "spinning" sound. Shut it down, sat, stated back up and same thing. I thought my prop was spun, but I've been searching posts and think it could be timing? Ignition? When starting, sometimes it goes right to 800 idle other times it jumps higher and bounces.
When the lu blew, it broke the drive shaft at the pinioin bearing and spun up to very high rpms before I shut down immediately. Checked compression and it's good at 90 all around. New lu went back up fine. I did have my wife rotate the crank clockwise so the splines would align. Any thoughts on what I'm dealing with?