I require to buy 1 engine-brigg & stratton for use in a power plus generator.
New or used.
Thank you

Hi,
Generators use and engine with a tapered crankshaft. That will limit your choices somewhat. Try:
Briggs Engine Search by Small Engine Warehouse
And:
10-11 HP Briggs Intek, I/C & PowerBuilt Engines - On sale with free shipping from Tulsa Engine Warehouse
And be sure to look for ones that say tapered crankshaft in the description.
Peace,
Clarke