Haynes Build Your Own INTERNAL COMBUSTION ENGINE Working Model Kit, HM01D, new
24 Jan, 2017
It didn't work despite constructing carefully and correctly
Didn't work even after hours of tinkering. One disappointed 9 year old. Instructions good and clear
Read other similar reviews and it seems kits are variable. Husband sanded rough inner walls of Chambers so pistons would run smoothly.
Lights not working properly at last stage
Bought sealed and from an individual so couldn't really ask for refund or exchange