415 works
I set my bike up with a Tioga 415 BMX chain and it has worked grate. my engine came with a standard BMX chain and it lasted about twenty miles before it broke. I had to change the drive sprocket( it got damaged when the chain broke). I did have problems with the master link, But after I just stuck it back together with a chain tool, a hammer and a chunk of steel its gone without a hitch.
I have been using a Skyhawk 66 and so far the CDI was bad to start with and the "new, improved" carburetor didn't work very well. It was dumping gas into the engine and I was getting horrible milage, so I took the old carb I had saved off of my old engine and it took right off. I am getting close to the same milage as my old engine and it can get out of its own way now(no bogging). I haven't checked the pug yet but I will let you know how it looks.
mike