Dating stationary engines
The first one is bad in comparison in the explanation.
I'll be printing and keeping this link. The webby thingo is full of JAP dating guideshttps://
Hi Cosmo, TOMM ran a two part article on the JAP 2S in June/July and August/September 2004. Sorry, my scanner has died, so I can't send you a copy.
JAP went out of stationary engines in 1963 - no idea if the 2S series lasted as long as that though. By the way - check carefully if you need to replace any fasteners on the engine.