The latest UMS gas radial 5&7&9 cylinder engines released on the market last year are now sold under the UMS brand. They redesigned the pushrods to have a deeper capture to prevent throwing a rod as tolerances slightly change during break in. The cam followers are now heat treated to reduce wear. The cylinder heads are machined from a solid billet of aircraft grade aluminum. All engines are shipped with exhaust collector rings installed. The electronic ignition systems are high quality components and designed in collaboration with RcExcell and CH Ignitions.
These new engines are certainly a welcomed improvement over the previous models of several years ago. They range from 55cc through 260cc offering a wider range of options to fit many more model plane sizes. I own one and it runs beautifully!