PSRU Gear box to drive a propeller using automotive engines like Suzuki G10, G13, G13bb, G15 and G16. This sale is for the gearbox AND the mount to mount to a Suzuki G series engines. Please specify your engine size. Flywheel is not included. Can also work with most other engines up to about 225 hp but mounting for other engines is not included. Please contact us for your mounting needs and we will set up a custom listing to meet your requirements.The ratio is 2.588 to 1. The weight is about 21 lbs.Our prop hub is drilled for Rotax 75MM by M8, Rotax 4\" and SAE-1. Standard bushing inserts mush be added to use Rotax 4\" or SAE-1 patterns.Our gearbox housing is CNC\'ed from 6061T6 aluminum alloy solid billet. Anodized for corrosion resistance. This produces a stronger and lighter case than is possible with casting.Our gears are precision helical cut from chromoly forgings and heat treated for strength and durability.