Originally Posted by chewy
Someone mentioned on another thread you just need a larger injector to get 30hp, anyone know a part number or where to get one?
That will depend on the make & model of your 25. I have successfully upped a 25 to 30 with a change of throttle link cam. I've also seen posts by Loco-z that essentially mean you are not far off a total rebuild where the bits you keep are not much more than the block & leg (- er I mean driveshaft housing at risk of starting that sub-thread again!
Do you actually mean injector? I ask because that would imply 4- stroke, which in turn means added lardyness. As Nasher says, if you get an old premix twin pot it will be substantially lighter. Have a look at http://www.old-omc.de/j_1977/seite_29.jpg
('77 Johnson Catalouge) - The 35Hp short shaft (I assume you'd have that for a SIB) is all of 114 Lbs - call it 51Kg. My 3-pot Suz DT25 was 15 years younger and nearer the 70Kg mark...
The twin system for the forces I think is used on twin 40s - so you get a portable 80Hp rig.