Hello Dieseldawg,
Nice low time unit, and may well be worth the money, but do not think you will get much joy running it on WMO. They are a direct inject engine, not so suited to heavy fuels. Tried WMO at low percentages in several other engines of similar fuel system design, but even in our hot climate, by 40 or 50 hours I had heavy carbon deposits on injector nozzles, loss of power and heavy smoke. OK again after I pulled injectors and brushed carbon off, but not a success.
Speed will be preset for your alternator frequency, 1800 for 60 hz, or 1500 for 50 hz. Do not alter unless you want something to burn up. Nameplate may rate it to
2600 for other applications but if it was built as a dedicated alternator set, it should come with a heavy flywheel and special governor parts for that job. Good little units, fair economy but not very quiet, and best bolted to a good slab of concrete. Regards, Combustor.