Yeah I'm not to sure about the carby as I can see where somebody has used a massive amount of glue to try and repair it.So as far as saying a good carby I don't think I would consider it as good one.Also I'm not sure how the kill switch on the twin works or seen one up close,but to me it looks like a regular G4 to me.What are the noticeable differences? Ok as far as timing is concerned I would have no idea on how to do that.I do have a parts guide on the twin,but that's all I have.So I guess any manuals would certainly be a help.If the condenser has fouled up,could it cause this lack of spark?I know I wanted to know more about the twin,but I really didn't want to do it first up.I must get Goliath working.I was really looking forward to hearing and seeing it going.[Censored] Goliath you will LIVE!!