Is it your opinion of such(?), because I can't find such requirement anywhere online. Below from THIS website...It has nothing to do with the amount of machines built,where they're built , or who builds em.The rule is,if it's gonna be sold in this country,it WILL COMPLY with EPA standards,that connector plug bein just one of em
Though there is no exact answer as to why motorcycles don't use OBD II protocol can be diagnosed below.
- Far fewer number of sales of motorcycles compared to cars, the average number of motorcycle sales in 2013 was 400,000 while the number of car sales was around 8 million. keep in mind that is just for the USA when you factor in the entire world the difference between a car and motorcycle sales are extremely wide, while someone can argue that in countries like India and Vietnam the motorcycles sales go upwards of 30 million about one tenth of them are actually fuel injected. So coming to the point, when you have a very very large gap between the car and motorcycle sales, there is no point in developing a dedicated protocol to govern the connectivity, it simply does not matter.