Well Dunecycle's were my biggest sales competition when I had my store . They were made in Santa Fe Springs, California and they sold a lot of small machines and most were only front suspension and rigid rear suspension and a lot of 5 HP Briggs. Their Spider machine was real hot with a Mc Culloch MAC101D engine and a Horstman torque converter. The also made a wicked full suspension machine with a Kohler two stroke snowmobile engine and twin expansion chambers. I fault them because the frame was real lightweight and compact not so easy for a big rider to be comfortable.
The even made one very unusual machine that had an 8 HP Wankel engine and to that I only saw pictures of one. The Spider suspended machine's are very rare I have checked e-bay all the time for over 5 years and only occasional see any machine and they are always the small 5 hp machines. APE is Allied Pacific Engineering
In all my racing on flat track, motocross and desert off road a Dunecycle never beat me
but I never played fair I had big time horsepower.
Steve