Back in the 60s I bought a Honda 90 trail for my wife. It had the dual range tranny. It worked OK, but to change ratios you needed to get off and switch the little lever on the bottom of the engine.
In the 70s Husqvarna brought out a 360 Enduro which had the dual ratios with a bar-mounted control, something like the enrichener controls on many Japanese bikes. A buddy of mine had one and I rode it quite a bit. It worked well. They did not sell many, so it was discontinued after a couple of years.
When I talked to my buddy a few months ago he still had it.
In the 70s Husqvarna brought out a 360 Enduro which had the dual ratios with a bar-mounted control, something like the enrichener controls on many Japanese bikes. A buddy of mine had one and I rode it quite a bit. It worked well. They did not sell many, so it was discontinued after a couple of years.
When I talked to my buddy a few months ago he still had it.