Thanks Karlow. Good idea, but I can't go back to 2-strokes, as no-one here sells anything bigger than a 15 anymore. I've added a 5hp 2-stroke now, so at least I know I can get myself out of the jungle if needs be (although at a maximum speed of of 10kph it would take me - um - 40 hours solid to get home from some of my trips!). Hey - it's better than paddling!

My last trip was just over 1100km, and no problems - long may it continue. I've just finished writing a book on my 10,000 miles on the Amazon, and if it ever gets published, I'll let you know..!