Such things (cars, bikes, machinery generally) are the stuff of nightmares. Until you've drawn enough of them, then you go through a stage of acceptance of the job, confidence in it, followed by affection for it followed by an obsession with it.
I never wanted to be obsessed with drawing machinery, so I never got involved in stage 1 - acceptance.
I try and avoid drawing it at all costs.
I do have a yearly commission for a book here in Oz which requires me to draw 4X4 vehicles. I can draw them ok now, but I still detest them.