Then is not a 12.5 hp but is something between 18.5 to 20.5 hp though I haven't seen the 400000 series.

Here is a list of the possible base engine model numbers. On the heads will be a two digit indicating the starting model number. IE 40, 42, or 46.

Sleeve Bore Models: 400400, 400700, 402400, 402700, 404400, 404700, 422400, 422700, 462700

Aluminum Bore Models: 401400, 401700, 421400, 42170

post edited by AVB - 2018/08/10 08:35:15