Welcome from Houston, Texas. The Road Star is a 1602cc or 1670cc bike. The Vstar 1100 is actually 1063cc. Here's some info that might help.
The Yamaha XV1600A is a cruiser-style motorcycle called the Yamaha Road Star or in Europe the Yamaha Wild Star. It has been produced from 1999 through current model Year 2012. The 1999-2003 models were the same 1602 cc naturally aspirated engines. And in 2004 they changed the displacement to 1,670 cc.
The Yamaha XVS 1100 DragStar, sold as the V-Star 1100 in North America, is a motorcycle manufactured by Yamaha Motor Corporation. It comes in two versions, the XVS1100 Custom and the XVS1100A Classic.
The 1100 is considered a middle weight cruiser and is a great bike, put over 65k on mine. The Road Star is a heavy weight cruiser, has lots of torque and very happy on the open road. Hope this answers some of your questions.
2001 Vstar 1100 Classic (sold), Cobra Slash Cut full exhaust, Dropped 1 inch with lowering links, ORK, 4.5 inch handlebar risers, Ultimate passenger seat, Passenger pegs moved forward 4 inches, Handlebar clock, KN air filter, Viking saddlebags, Additional rear lighting
Loose nut "me" behind the bars
2006 Harley Electra Glide Ultra Classic