brand new blasters come with an extra jet, suggested to be put in under certain winter/cold temps, maybe thats what he gave you ??
or he may have rejetted, if needed, for the oil injection delete, airbox lid removed, aftermarket air filter, elevation, ect. ect
we need more info, and numbers from the jets
i wouldn't ride it until you read some more on here and understand jetting and plug chops
both of those terms are searchable on here
there will be a pop quiz later tonite, LOL