First thing is to relax!! We have all been there and we will all be there again. Welcome to the world of boating.
First, did you put it all back toghter again the right way?? I am not trying to say that you are stupid or anything. But did you go just like the manual said? Some bolts have to be torqued just rt. Is everthing sealed good?? Just a little air leak can mess things up good! Or a water leak! Take plugs out and make sure there is no water in the cyl. If there is maybe there is a crack in the water jacket not the gasket at all?? Did you remove the Carb's at all?
I found that I Boats is a nice place to ask ?? and they really no there stuff!! Give it a try
http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi
I hope all works out well!! If not its not the end of the world, Fall is comming and there will be lots of motors on the market. You might find a nice used deal. I found a 1989 175 hp Yamaha for $1800.00 with everything!!
If not then then in early spring? I use my Tax refund to suport my habbit ;D One year the boat next year repairs, next more repairs, next more repairs, next Repower, ect, ect............. Get the picture.
Why we spend so much money, sweat, tears, hate, discontent, all in the name of fishing is beond me!! But I love it!!
It has taken me 5 years and $6000.00 above the $2000 I bought the boat for to get where I am today. And this is for the boat! Wait till you get into the fish finder, GPS, Rods, Reels, and all the other little things you need.
Good Luck!! If you need ant Info I will help all I can! But take it easy!! You have had no boat all this time and one more season won't hurt. You will get there!!
Listen to me if I lost my boat for a day I would be like a new born without his mother.