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Scout,

All the engine manufacturers have pretty detailed information on all their products which is frequently updated. Keep in mind that manufacturers HP ratings may be off by as much as 10%. If you want the most accurate information it should be available from the EPA.

If weight is a factor in comparison make sure you include accessories you may want or need that may not be included in the weights for the engine. I believe bare engine weights without lubricants are normally used on the web sites.