I origionally had the con rod upside down, when I assembled the engine and the whole thing would not cycle freely so I reversed it, the piston cycles freely and this i believe is the reason why it started first time when I assembled it the first time, as I say it ran for 20 mins before the fan through some centrfugal/centripetal force mutilaed the D whole on the fan, this threw the firing out of timing, which I subsequently replaced, the origional Fan had a tin cover on it which when removed liberted pertinent information about the torque setting for the rotor blade bolt, which should have been 60nm, origionally I just did it up firmly until the rotor blade assemble stopped turning on the pully assembly, I believe I did it correctly this time, however I do not know how to check the correct timing as there is no obvious markings, it may have done it again but the assembly is very tight this time and I would need to use a puller the remove the pully assemly, previously it came loose with two taps of a hammer.
Alfred
