I did a total engine rebuild on my ride to work D7 back in the late 70's and decided to fit the correct pear shaped tank in replacement of the later type that the machine was wearing at the time. The tank had been sitting on the shelf for some years. It was clean and tidy and made the machine look smart. The reason I mention this, is that I didn't change the cork in the tap, or let it swell, so the morning after fitting the item, the engine fired once and promptly bent the conrod due to a hydraulic lock caused when the fuel had run past the wizzened tap cork overnight and filled the crankcases. The piston must have been timed just right to allow this and the carb was also worn so leaked a steady weep through. My local dealer was suprised at the bananna shaped rod as I handed over my brand new crank and gladly took the £25.00 for a replacement off the shelf item. I remember they had a line of rebored cylinders with matching boxed wellworthy pistons sitting on each pot. Oh dear, I'm getting old. Check your carb is clean and the needle is seating well. I wished I had at the time. And if you store a tank or tap, take the cork out and imerse it in some oil to keep it swelled.

Regards. Steve

--- On Tue, 30/6/09, Alan Burgess <ab400@...> wrote: