I bought a used 2003 Quadsport z400 with a 440 big bore kit. 1st time out today it ran great for about the first half hour and then would not start anymore. I got it started a few times and still ran strong but would not start after shutting it off. After some inspection I see antifreeze leaking out of the bottom of the motor. What does this sound like? I hope I didn't buy a lemon. This bike did sit unridden in a garage for about a year prior to me buying it.

 

Have you checked your oil, to make sure it is not mixed with coolant? Is your cooling fan coming on at all? Does the temperature light come on whan you turn on the key?

 

Where exactly was the coolant leaking from? Base gasket of the cylinder?

 

I haven't checked the oil yet, the fan does come on. Here is a pic showing where I believe it is leaking from: Coolant Leak

 

Seeing how its on the top side of the case, id think thats where it puddles, and the leak is above it.

 

Does your exhaust smell sweet?

 

In the picture it looks like a plug find a hex wrench and try to tighten a little, dont use much force though, you may crack it. Check it and we will go from there.

 

Today after everything had dried I checked again and it appears to be the head gasket leaking.

Leak