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Most of the 115hp were around 400-420 dry but then Yamaha and Mercury introduced lighter 90 and 115 hp's.

Adding fluids, prop adds a good 20 lbs to get you very close to 410.

There is a reason why the max rating matches up to the Mercury 115 hp weight. The rating is synched to the product offerings. That is why whenever a new engine or reduced weight motor is introduced, the hp offered rises on subsequent model years.

i.e The Nantucket was first introduced with a max hp of 115 and a weight limit of 510. When the I-4 Verado line was introduced the hp max increased. First to 135, then 150 and now stands at 200. Engine weight for the 200? 510.