J/30 Class Association Forums J/30 Forum Cruising Discussions Preferred cruising RPM ?

The 2GM original version was 13hp. There are also versions that are 15, 18 and 20hp. The 2GM20 is 20 HP and installed on some J/30s. if there is an "F" suffix (e.g. 2GM20F), the engine was installed as fresh water cooled, although some without the "F" suffix have been converted to fresh water cooling.

ps - Not all the Yanmars in the J/30 are 2GM series. They also installed 2QM and 2YM series engines.