[QUOTE="Paul Carmichael"] May have asked here before, but don't remember. The Blackbird jumps out of 5th now and again (under power - ouch).[/QUOTE] Worn gearbox dogs. [QUOTE] Will this just mean a new 50c spring or summat, or do I scrap the bike now?[/QUOTE] Break it for parts. That's a seriously expensive job. Niall Rowan, sometime French Runner, had it happen on second gear on his ZX9R. I gave him the advice I've just given you. He found a dealer who reckoned that it could be done for about £450-500. In theory, you just remove the engine, remove the saide casings, clutch, ec, invert the engine, remove the botom crankcase half, remove and replace the offending gears, and then reverse the procedure. In fact, there are *always* other things that need doing. My guess was that t would cost him about £1200 and IIRC I was only £100 out.