[QUOTE="Lozzo"] I rebuilt the SR250 completely over 7 lazy days when I was unemployed. Sorting the engine rebore only took about 4 very lazy hours. It'll be done in time.[/QUOTE] I did a top end job on the spare Honda SL125 engine I had knocking around the garage, when I had that week's break recently. Only new piston, camchain and tensioner. Took a day to take it down and a day to build it back up. Should have just taken a few hours but I was stopping every couple of minutes to take a photograph of what I was doing. Little singles: a joy to work on, most of them. The only thing that held me up was the inevitable butchered fasteners on engine cases. Oh, and trying to find a way of locking the engine up when I was undoing the alternator rotor. One dodge I've used in the past is to get some old crash helmet strap webbing, fold it over a few times, and jam it between the sprocket teeth and the engine casing. Then put the engine into gear. Normally it works a treat. Actually, I've seen it used to lift stuck two-stroke barrels off an engine. Jam it into the exhaust port, and put some gentle welly on the kickstarter. The piston catches on the webbing and just brings up the barrel with it. Anyway, the sprocket on this 125 had fewer teeth than Shane McGowan - honestly, it was the worst I have ever, ever seen. Nearly worn smooth. So I took it off and clamped some Mole grips onto the output shaft, and let the engine turn until the grips were jammed up against the cases. Out of curiosity, what would you have done?