Welcome to the forum from North Carolina. Happy you decided to join us. The exhaust mod will not create a coolant leak. Here is a link to the factory repair manual coolant flow page. Clean off the bike and dry throughly. Then run the bike and look at the areas where there is a coolant connection.

Kawasaki VN800 Service Manual (Page 59 of 406) | ManualsLib

www.manualslib.com

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Most likely from the coolant return pipe orings drying out.

 

Thanks guys... Took the tank off and its the line directly next to the carb. Put another hose clamp on it and hope it does the trick. When its warm enough i'll test it out.

 

quiet pipes with back pressure will not be the cause of a coolant leak, and was the bike outside during winter? with temperature cold and then starting it up then letting it get cold things expand and contract, sometimes metal parts will expand then contract faster and might cause a rip or tear in rubber hoses

 

It was indeed the coolant return pipe, right where it enters the bottom end of the motor.. Looks like a lot of work to for one seal.

Spackled on some JB weld.. ghetto but hopefully it works. Prob dried out over the winter. I noticed it only leaks when the bike is cold

 

If they have never been changed, the coolant hoses and those o-rings are 20 years old. If you are getting a little leak now, chances are you will have more leaks later, or even a catastrophic failure when you are out riding. Some folks never change these things and never have problems, but when you have had all of your coolant dumped on the road when you are miles from home... .

I suggest using the link Tourer provided to download the service manual and go through all of the maintenance procedures. You may not want to do it all at one time, but take it in logical lumps (flush the cooling system and change the rubber parts in one session; rebuild the brake calipers, check the front wheel and steering bearings in another session, etc.).