I'm heading down the Great Ocean Road this weekend for a much anticipated ride, but my bike's behaviour as of this week is worrying me. Twice now in the last fortnight, my bike, which never otherwise blows any smoke, blew great and very white clouds. After a warm up and some revvs, the smoke completely dissipated. The second time - last Monday - that it did this, the bike had shown no hint of this all day (I had been riding, and indeed I ride the thing daily). This second time, I was riding along about two kms later, and suddenly the engine went rough and lost a lot of power - the exact same phenomenon as when it was once running at least one piston down due to a pulled hose. I pulled over immediately, and it immediately came right, and gave me no more problems. This morning I rode into Uni - no smoke - and as I was slow-riding the bike into a parking position, the same phenomenon happened again, albeit very subtly and only for an instant, after which it was fine and didn't return, and hasn't again today. Any ideas of what might be happening? If it helps, two other recent events: 1) The bike has been getting an oily/greasy build up on the battery terminals, causing it sometimes to short out. 2) The head gasket blew even more - over a month ago I was freeway ridng two-up in stinking hot weather and suddenly there was a subtle loss of power, whcih quickly came right, though since then it bleeds a lot more oil. The bike is a Kwaka GT550, 135,000kms, belly full of engine noises, and hasn't had a service since before it was made! If anybody can give some suggestions, I'll try inspecting them before i head off down the GOR. A friend wants to go pillion, so I also need to think about whether that will add risky pressure to the engine. Thanks, Matt.