Im looking for some power ratings on this engine. Perhaps a manual as well. I need to know what plugs to use
http://www.serpent.com/product/201009/

It's a Picco based motor so I would run Picco plugs.

Don't know much else about them but it should run pretty good.

dont know exact rpm but i had that motor last season all i can say is fasssssssssssssssssssst with a o.s carb hard to tune a times but once you get a tune it a ROCKET MY 2 CENTS