Okay I have been reading a lot about about how Honda's tend to get leaks at the cross over tubes between the front and back cylinder heads. When I talked tohonda the quoted me $75 bucks to fix it.
Well my 1998 Honda VT1100C3 Aero had this problem so I thought that I would do a little tech so that others can do it on there own and save some money. This will take about an hour to do.
First step determine where your leak is coming from. My leak came from front cylinder head at the tube.
Next drain coolant from system. (check repair book for insturctions)
Next remove Cylinder head covers...
Its hard to see in the pictures but there are two clips that hold the tube in place remove those clips. I used a pair of long needle nose pliers. After removing the clips twist the tube untill you can see the o rings that need to be replaced.
Here are the replacement parts. These o rings cost about $1.80 a piece you will need 2.
I was able to find a pick that has a 90 degree angle on it my dads gunsmithing box which made it easier to remove the old o rings. if your cant get the old ones of you can break or cut them off. ( I had to do this to one on my bike)
Once the old rings are off I lubed the new rings with WD40. ( I sparyed some in my hand and then rubbed my hands togather with the new ring between my hands.)
Since there is not a lot of room to work I used to long peices of dental floss wrapped around the new ring. (one on each side)
This is easier with the help of a friend. Have your friend on one side of the bike while you are on the other. With a pair of long needle nose pliers have your friend reach through the cylinder heads and grab ahold of the dental floss. Now it is just as simple as streaching the o ring just a little bit. (to much and it will break) and getting onto the tube.
After replacing the o ring with a twisting pushing motion move the tube over untill you can see the other o ring and repeat the steps. Once you have replaced both o rings move the tube back and replace the retaining clips. Once you have put the bike back togather replace coolant with motorcycle coolant. Ride around for a little bit and then let bike cool check coolant level again.
Hope this helps.