The the tachometer is for 4 cylinder engines and the reading should be multiplied by 0,5 to get 8 cylinder figures, which would be 650-750 that it is, so the movement is approx 125 rpm measured, it does not change that much in reality, just the tachometer which made me curious why it does.
The AIR injection has been taped closed temporarily.
I have looked down the carb with a flashlight at idle, and it looks dry from above, no fuel dripping visible.
