If it is indeed the one I saw here in MS, most (likely all, but I don't remember for certain) of the reduction took place in the Honda motorcycle enigine's gearbox. The chain was basically a 1-1 power transfer device. The one I saw actually had a pilot-accessible shifter. He said that he'd run in (IIRC) 2nd gear flying solo, and downshift a gear to get off the ground if carrying a passenger. (Not an effective way to increase power, but I suppose he was able to get by using it.) He did say that he had flown it from somewhere down in south MS to the flyin, in central MS. Would have been at least 100 miles.Haven’t got a clue where the photos were taken, I collect interesting images for inspiration.