Scale is relative, do you want a large scale of a low horse power engine or large scale of a large HP engine.
1/3rd Scale of the 5HP Galloway is a good size and a nice build and available from Minicastings or Forrest Classics do them here hasa flywheels of 10.5" Doug at Minicastings also has a few others that are not listed such as the ball Hopper Monitor that was previously sold by Lone Star.
Perkins is not a bad size and quite reasonably priced, Redwing a bit smaller and a bit more costly. R&V have become hard to get but both their engines are a good size. Star and Swan are also a food size. Then there is the Economy from Engineers Emporium which is a good size, they also have the slightly smaller Senior and a "banford" Tulip style engine
Antique Engines has a list of suppliers though a few are out of date or no longer in production
Anson Engine Museum may have one of Alyn Foundry's 1/2 scale gardeners and Graham Corry may have something stashed away, I have had 3 engines from him in the last 18months all 9-10" flywheels.
Edited By JasonB on 17/06/2019 18:36:33
Edited By JasonB on 17/06/2019 18:43:37