Just stumbled on this in your forum & bugger me [it's me & brings back memories] The add was made at Foxton Beach [NZ] in the sand dunes [probably not mean't to be in there] Tim Gibbes [Honda & Yam Dealer] from Palmerston North organised it for Honda NZ & i rode the Elsinore 250 [doing feeble jumps] & as i recall Chris Harris from the wellington [honda shop] rode the XL250 & SL125 etc. Long time ago & took us two goes over two days, can't remember why--maybe weather. Amazing what turns up on here. Cheers Morley [NZ].
ps, must have been just before the shop went Yamaha only after Honda decided they wanted one brand dealers. Were good days when you could have Yam & Honda together. The Shop had Husky & Bultaco also. I just spanner'd there [hid in the corner]. Cheers.