Originally Posted by
gligoco
Before changing your tank, try to protect your carb from the hot air that you are using to heat the engine...
This problem look more like a "vapor lock" than a bad thank...
I'm from Brazil, and here vapor lock is when your carburetor is to hot and the fuel evaporates before enter in the engine, I don't know if in the USA you use the same term.
I had this issue with breaking in my 3 port sport. I'm not sure if the 5 port has the same aluminum body carb as the sport models do but it soaks up heat just as fast as the motor and would vapor lock really easily. In the end I had to heat up my motor to just below that point, fire it up, then immediately get the heat gun on it to get the temp the rest of the way up.
5 gallons later and still running strong as soon as I replace the front bearing.
*Edit* To the above poster, that sounds like hydro lock, not vapor lock. 2 different things.