Its hard for me to comment on what was a real bike back in the day (on this side of the world ) as i didn't arrive hear till late 82 .
However i grew up and started my racing in the UK in the mid 70s. As i remember it in Schoolboy racing Suzukis were by far the most popular ride and in the youngest classes (cadets) Italjets were very popular .
In Seniors again it was a Japanese benefit with Maico being the most popular Euro brand by far . The 78 ,79 Maicos were the choice of clubman riders and seemed to turn ordinary riders into podium finishers . There were obviously a fair spread of other euro brands and British built specials .
I dont recall seeing any HLs other than Abergs at the GPs , i do remember the Hagon Eastwood monoquoce Yams though and obviously a number of CCMs . The only bikes i remember being regulary push started were CCMs , i dont recall Maicos being hard to start .
As for top riders on different brands in late 70s UK , Neil Hudson on Maico , Andy Roberton on Montesa , Vic Allan on Bultaco, Bob Wright CCM , Vic Eastwood Hagon , Pete Mathia Cotton, EMX Dave Tomasik KTM .
I came to NZ in 82 and the scene was 99% Japanese with a few Huskys thrown in and still no HLs