Had another one go on me yesterday. Can't say I expected it to be quite so broken though! It had felt a bit lumpy on Friday, but when I started it up yesterday to clean it, the engine started trying to make a bid for freedom, jumping around all over the shop. Diagnosed it as being No 3 cyl, so phoned up the AA man since I didn't have a spare. Came out and confirmed the problem and, to my shock only pulled out half the pack!

From a design perspective, it's awful. The end of the upper chamber coincides exactly with the unsupported area of the coilpack where the chromed cage bit meets the upper steel casing. I'm amazed it ever got accepted in the first place.

ouch!