as a suggestion, back in '97 I'd planted a 3.5hp briggs engine on top of a 6hp lower unit that the engine had seized on. had to remove and disassemble the powerhead, cook the crankshaft on the stove a while to draw down the hardening so I could saw off the output spline, to mate to a steel lawnmower blade hub. it worked GREAT! a buddy chucked the spline in a lathe to face-cut it straight, and welded the "adapter" together in the lathe too. (yeah I know this is an electric group here) mounted the engine to the lower unit with short sections of pipe, washers, bolts, and nylock nuts.. whole project maybe cost me 50 bucks, connected the throttle of the tiller arm to the carb, had forward-neutral-reverse all working. I was pretty poor then too. a local boat shop gave the 6hp to me for the asking, it wasnt worth their time to mess with. decent used lawnmower engines are dime-a-dozen too. decks rust out long before engines die, the one given to me had a wheel gone for that. thing would run all day on a gallon was nice. thing almost looked like it was made that way too when I was done splicin em together, there wasnt any big gap between, that old lower unit's pan casting was tall sided. same kinda thing, "ask and you shall receive", "oh that old thing? have at it!" the 3.5hp briggs was good for 7-8 mph at 1/2 throttle, top speed about 13mph and would just plane running solo.. with heavier loads however, it got awful warm running it hard. a 5-6hp engine might do same for your 10hp lower if its the powerhead that went, and you might need to pick up a different prop later.. briggs only spin 1/2 as fast but have torque. steeper or lesser pitch? you'd figure it out pretty quick what'd be more appropriate. the only "downside", it was an outboard you didnt just casually lay down because of the built in fuel tank, the oilpan and filler, piston etc.. also had to rotate which way the recoil starter faced was a pretty simple surgery. air cooled, no fear of running in muck either. I wouldnt put 10hp on an 8ft skiff, but I'd sure put it onto the shanty and tow the skiff. briggs horizontal shaft coupled to a prop shaft inboard, throttle and rope steered rudder? that'd be some work building a skeg that might snag in shallows of course, but doable. someplace online shows how to do a simple F-N-R belt and friction wheel trans too. 4-6hp would probably scoot the shanty around nicely enough and for pennies once done. downside to that is needing propshaft and shaft log, then the work installing. slapping a fat lawnmower engine to a lower, probably a much easier task. 25hp inboard?! SWEET!! also probably way beyond what a shanty would need, it'd probably be enough to get it planing near 20mph and wouldnt THAT be a sight to see  -ok, enuf about tinkerin with briggie motors.. but something to consider maybe. --- On Thu, 2/2/12, damonalane <damon.andrew.lane@gmail.com> wrote:
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