My Generac is only 80lb, but still you can't just carry it out from compartment. I lose the bolts, lower the camper with box or table under the generator, than I had to tilt generator to come off the railing and lift the camper with remote jacks.
Just curious..I thought option was a Generac, and if so is unit rotated in camper to make spark plug inaccessible? Edit Never mind- a little looking around appears probably an Onan.
Yes you'll need to drop the generator in order to get space to access the spark plug. The only thing accessible on these is the oil drain bolt and air filter.
We had to drop ours when it was first new, and it was a pain. Make sure you have a jack as it weighs alot!