Yes you can use a CJ8 for a CJ8Y, but you cannot use a CJ8Y for a CJ8......the CJ8Y has about 1/4in more thread.
Champion CJ8
Champion CJ8 is most popular
Cj8 is hotter than cj7
A CJ8 Champion plug can be used with a 1974 lawn tractor that uses unleaded gas, however, it would be better to go with a hotter plug. The hotter plugs will keep the tractor running longer without needing to replace the plug sooner than expected.
You can use the following plugs for a cross reference for a Champion CJ8 Denso - W20M-U NGK - BM7A or BM6A (BM6A is a hotter plug than the BM7A) Bosch - WS9EC Autolite Part # 255
.30
cj6y and cj7y are identical
an rc8j resistor or a cj8y
Xtreme 4x4 - 2001 CJ8 Scrambler Part II 2009-2 was released on: USA: January 2009
You would put a roll cage on a Jeep Scrambler CJ8 by just screwing it onto the front of the car. The process is very easy and most people should be able to do it.
Yes a Scrambler is also known as a CJ-8