More Carb Action iii & Tachometer

So I left this particular saga with a very badly running engine. This time, the old team was back together, that is, the mechanic, the tamed electrician and the tea boy. Here they are. 

One looks like he is as high as a kite and the other is having an Ascent of Man moment in the cab with something red and shiny. 

However, without them I am lost and thank you for their help and ridicule over the last four, mainly fruitless years