Lack of control in reverse

[Blaise]

yanmar transmissions.

Remember that all Yanmars use the same reduction ratio in forward and in reverse, rather like a railway locomotive; so with an application of a left-hand prop the 'forward' gear position may be hooked up to the transmission in reverse and vice versa. Look at the gearbox (I forget which is which) and you may find that's the case.

Only the QM series engines have the same reduction ratio in forward and reverse. The GM series are 2:62 in forward and 3:11 in reverse. (0r very close) Midnight Sun has a folding prop and currently a 3gm30. I miss the 2QM20 when backing.