The ebay bike could make a nice riders bike much like Tims...I'm currently putting together an engine with a 100mm stroke and 90.5mm bore (644cc)...I haven't done this particular configuration before but I'm expecting it will be a great engine for general running about and longer trips...The B33s basic design is so good it will take that sort of thing and still retain it's overall high level of reliability....Ian
Hi Hamish. The bike came with an M33 tank when I bought it. I did run the bike with a chromed B31 tank at one time. This you had to alter. I did that by welding new front mountings onto the old ones, otherwise the tank sits to high and fouls the handlebars. It sprung a leak so I reverted back to the one that came with the bike. Ian