Heres what weve been using on fan builds and theyve came out pretty nice. You cant beat the simplicity of them.
From Mcmaster Car you will need:
Part 2737T717 (ansi 41 sprocket, 60 tooth, 1" Bore inside diameter)
Part 6280K475 (ansi 41 sprocket, 18 tooth, 1.5" bore Inside Diameter
Part 6261K456 (ansi 41 roller chain)
From Midwest Control or Baum Hydraulics (baum hydraulics is a little cheaper) you need a 5/16" push pull cable, bulhead fittings on both ends, with 5"-6" of travel, 10/32 threaded ends, and two heim joints to fit on each end. (for a 20ft boat we use a 24 foot cable
A 33c series push/pull cable for throttle with bulkhead fitting on one end and clamp fitting on the other end. (for a 20ft boat we use a 30 foot cable)
From any local machine shop you need:
36" x 1.5" Outside Diameter Steel shaft (for the motor mount plate)
12" x 1" Outside Diameter Steel Shaft (to hold the idler sprocket)
From the bigbearingstore.com:
(2) 4 bolt flush flange mount flush bearings with 1.5" Inside Diameter, to accept the 1.5" outside diameter steel Shaft
(2) 2 bolt flush mount flange bearings with 1" Inside diameter to accept the 1" idler shaft
(2) 2 bolt pillow block bearings with 1 5/16" Inside Diameter
The one thing were gonna change and try diffrently is the motor mount shaft. That shaft and steel plate weigh quite a bit. And for maybe 20$ more I think you could get a 2" OD aluminum shaft, and weld a 3/8" aluminum plate to it for the motor mount plate and be fine. We havent tried this yet but we may try it on one of my fan boats.