I'm at the engine mounting/tank installation stage of construction on mine right now. As per my posts above, I chose the Jett 12 oz bubbleless tank. I also decided to lower the motor by 1/4" just to bring the carb barrel down a little lower. I chose to lower the motor rather than rotate the cyl towards inverted (like I had indicated in above posts). That just seemed like too much work. I did have to modify the tank compartment and F2 so that the Jett tank will slide into the upper most portion of the fuse to get the carb and tank closer to the same line.