I have a 1988 Johnson 225 "Looper" Mod# J225TXCCE on a Proline 230 walkaround (about 5000 lbs Loaded) running a 15 x 17 prop. The engine hour meter is showing 1100 hours. The last few times I've used the boat, it has been very, very slow to get up on plane (the hull is clean & the prop hub isn't slipping- rpms are slow to climb), but once on plane will run 5000-5200 rpm, 39-41 mph. I bought this boat/motor in 1991, it would run 5600 47-48 mph I replaced the power pack last year (the engine would not turn off -3rd power pack) and that worked for a few trips, but now I have the same problem. BTW-replacing the power pack did not affect the loss of power. Any ideas on early power pack failure ? I also did a compression test, the only way I could do it was to pull only one plug at a time and crank the engine with the ignition off by jumping the solenoid. If I pulled more than 2 plugs, the bendix would not stay engaged more than half a revolution. I'm guessing that the engine turns about 200 rpm while doing the compression test. I'm getting 73, 73 & 80 psi on the port bank top to bottom and 75, 75, 75 on the starboard bank. I've used decarb - Valvetec & Seafoam over the years, but I'm afraid I've got some stuck rings. I did my first compression test on this engine (the same way) in 1994 and got 74, 75, & 88 port, 83, 78 & 79 starboard. I'm guessing that these compression readings are low even considering the way I'm having do the test. I did test the top port cylinder with the engine running (900 rpm) and got 105 psi. I know this is a long post, but I want you to have all the info :/