[DanEC]

I was wondering if a heavier check ball/weight might help this. But, I also wonder if that might affect the whole set up of the fuel shot slightly when the throttle is opened. I haven't been inside the accelerator pump on these carbs so I'm not certain what type of valve it has.

Lacking a better idea at the moment, I may just stick a square of EZCool insulation on the bottom of the accelerator pump cover with a few dabs of Strip Caulk and see if that works.