VLX weighs 452 and the Spirit 750 weighs 553. All according the Honda website for the current model years. That's about a 23% difference in weight. Honda doesn't publish the HP numbers.Thumper wrote:If you're comparing the VLX 600 and, say, the Spirit 750, the extra weight of the 750 is going to chew up the nominal HP increase over the 600.
However, the TotalMotorcycle.com Buyer's guide lists Honda's 750 Shadow engine (used in the Shadow Spirit and Shadow ACE) as producing 75HP. http://www.totalmotorcycle.com/buyersgu ... dowACE.htm
They list the VLX600's engine as producing 40HP. http://www.totalmotorcycle.com/buyersgu ... LX-DLX.htm
That's an 87% difference in HP.
Granted those numbers are for the 2004 model years (hence no mention of the Shadow Aero 750), but the engines are essentially unchanged since that time.