The thread Joe started was on his YS 1.10 when he couldn't get it to idle. There is a forum for glow engines and there is factory support for OS. If you go into the glow engine forum there are step by step instructions on how to tune your FS and if you can't find any {there are bnches} then you can ask Bill Baxtor at factory support. How to tune a FS is pretty much the same as a two stroke as far as the needles go but you can run into other problems like valves and glow plugs. Go look or ask Bill.