Marine Outboard Engines?

[CaptBeach]

Why haven't Marine outboard engines been used in LSA Kit Planes?

For example, Suzuki DF 175 I-4. Same block DF 150 but with variable valve timing. Fuel injected. 174.9 cu in and 175hp at the shaft is 1 hp per cu in. The entire outboard is 475lbs but factor in that's every part, lower unit, shafts, housings, engine covers, chassis. The long block itself might weight 200-250 if that. Marine engines are over engineered, designed for short bursts of power and long running times at fixed rpms, (sound familiar). Most run at no more than 6k rpms so maybe a reduction box might be needed. BTW a new Suzuki Short block 175hp is a little over $3k, Brand new running engine is about 10k, sell off the rest and have a complete 175hp, fuel injected motor for half of that.

So...why not?