Hi AVB,
I feel your pain and it does not help if I say we have all been caught out by an intermittent faulty spark plug. As for this Honda I fitted the 2.5 kg weight, first pull it fired up and did exactly what it should. Since then I haven.t got it started and it is back to kicking back so I will pull the motor off and put it on a push mower and get rid of it that way, not wasting any more time on it. I think I will put a brand new motor on it and get rid of the slasher that way, and if that works I will get a few more new motors and put them on the rest of the slashers here