Water out of exhaust pipe

[Beck]

How much water can be trapped in gas? How much water is made during combustion?

I am getting a lot of water out of the exhaust pipe on my little pulling tractor. This one is powered by a Suzuki GSXR 750 engine. I am not losing coolant. The motor is running great. The pipe goes straight up about 2' in front of me so it is very visible to me when I take off. I have had others ask what I was putting in my fuel. I have been adding the "recommended" dose of Marvel Mystery oil in an attempt to clean up the intake valves. This little thing screams. I had it bouncing on the rev limiter at 15,500 rpm last week while pulling. I had too low of a gear in it for that track.

I guess the easiest thing to do is drain the tank and refill with fresh fuel to see if that cures it.

On a side note. How much fuel do you think needs to go through a pump to "flush" lower octane fuel out of the system before the higher octane is running undiluted? I only buy a few gallons at a time for the pulling tractors. I usually put some into another jug before filling the "good" one.

[enjenjo]

The way gas pumps are made, it should be less than an ounce. There are two hoses, one inside the other, and it is blended at the nozzle.