I think you mean Allen hover mower? I have an Allen with the Suzuki M120X engine - very good indeed. I must have had it 16 or 18 years, and it's only been serviced twice in all that time!
I do have the original Owner's manual for the Suzuki engine, but I suspect you want something more comp[rehensive and aimed at professionals? I just yesterday discovered that Allen had gone out of business a couple of years ago, and I found out about a year ago that they were no longer using the Suzuki engine :-(
Nicolas.
September 2008