Well, one solution is to get a 10 tooth engine sprocket that will run 415 chains or BMX Bicycle chains. I use a
Wippermann BMX 1R8 chain I got from my local bicycle shop. It is 1/2 x 1/8 and is one of the strongest BMX chains available. It is nickel coated with reinforced plates. It has a breaking load of 12,500 Newton. It's thinner than the 415 and you can use it as a regular bike chain too, but I found that it runs through my china girl sprocket much smoother than the bulky 415. It will run through the standard 41 tooth wheel sprocket with no problems.
Dax sells these 10 tooth engine sprockets for $9.49, also, some kits come with this sprocket standard. They are slightly thinner sprockets. If you are not sure if you have one just try to run a regular bike chain through it and see if it flows through it easily, if it doesn't you will have to get the thinner engine sprocket.