really need help with my merc.

[champman]

Hey folks, I could really use some help from anyone with a working knowledge of a 1989 175hp merc. outboard. I have had some over heating problems for a month or two. It will run cool enough at idle but wants to heat up at full throttle. I have changed out the water pump,stats, water lines and today I replaced the poppet valve but she still wants to run very warm to almost hot. I ran a compression test on the cylinders, all had 130 psi. I called the local merc. dealer and he seems to think it is the temp. sending unit after all I have done to it. The one big question I have is about the poppet valve. When I put the ear muffs on and start her up a small amount of water is coming out of the weep hole on the poppet valve housing.Is that "ok" or is somthing wrong there? The dealer thinks it shouldn't be leaking but he didn't sound too sure. If anybody has any thoughts on this it will be greatly appreciated. If you want talk one on one about this, post a reply and I will give you my number.thanks, Bill