|I know I am chating to myself here but someone may need the information I have accumulated on modern currently available outboards in the future. |
Firstly, the cutout of the well varies from yacht to yacht. The original cutout in INMA was only enough to drop the leg through and secure the enginr to the mounting area. Othe yachts I have looked at have larger cutouts leading to within 30-60mm if the stern. Inma has glassed in reinforcements for the rudder that limit the practical length of the opening.
INMA has a fixed tiller, hence the clearance to the top of the engine is an issue.
When measuring the opening and outboards, I use the rear corner of the mounting area as the datum because it is easily located on the engines etc. The critical dimensions on INMA are the maximum leg swing radius is 700mm (from the datum to the back of the opening in the well). The swing radius for the engine cowl is 520mm.
NOW MEASURING THE ENGINES Old outboards tend to fit OK in the RL 24 well (surprise, surprise). The OMC 6HP SS from the 80s is small and fits easily. I could not find an old 6HP Mercury apparantly they had a plane steel shaft and none survived this long! A Chrysler 6HP fits easily, A Honda 5HP SS fits easily.
The old larger outboards with through prop exhausts were too long in the leg.
New outboards tend to have significantly higher engine positions and top mounted starters that significantly restrict clearance to the tiller, most 6-10HPs are to high and too long. Infact I could not find a current 6-10HP that fitted. The big engine that stood out as a gret design if you can modify the tiller and well was the Johnson 8HP with its fron shift etc, it was significantly better in finish etc than the others.
Of the 5HP outboards, the Honda and Mercury/Mariner SS were able to just mis the tiller and retract in the well. The Johnson 6HP fitted the well but was very close to the tiller.
So what would I recommend, I am going to fit the Merc 5HP and if its OK, I will buy it. It has a 4Amp charger optional and has high thrust props with the through prop exhaust. The Honda is too heavy and hard to maintain. As for two stroke or four stroke, they are identical in dimensions. I will go two stroke on proce and self servicing.