Just found a really useful source of information on You Tube.
The channel is called The Motorcycle MD. The guys name is Cody Richards. He is a certified Honda technician.
Lots of information on Carbs, Points, Brakes, Electrical etc...
Not just Honda inline 4s, but most is relevant.
https://m.youtube.com/channel/UCmpL0CxrbzbsD6G0GE0P_DQ
