Spura,


Mhhhh "assuming" your carb tuning its OK, i've been on that trouble over a friends car testing a GO 5 port, and by the behaviour you describe during different "stages" of the tank being filled full, medium and low levels of fuel, i think maybe its your tank not giving back enough constant pressure.

Try changing exhaust lines longitude and/or changing fuel tank. Here specially on Hyper 8.5 cars we discovered the tank not having good seal and the tune of the engine changed as the fuel level went down on the tank.

On my 5 ports, usually temp when the tank goes dry its no more than 138°C, and average 125°C-130°C during the rest of the run.

hope to help,

cya