Stock fuel injection is fine. Although they will benefit from an aftermarket eprom and power commander. They've got incredible low and mid range torque but less top end compared to the Honda. Stock gearing is not a problem, you won't be wanting for acceleration, although it's quite tall. Who needs to go 165mph ? Dropping a tooth on the front or up 1-2 in the rear makes a great bike even better. These years reputations were built on a superb chassis, brakes and cornering ability.
I wouldn't be concerned with reliability. They're made to be ridden and the maintenance is all very routine if you've owned a Japanese bike. The twin is hard on the battery so keep it on a tender. Only really bad thing I can say is there aren't a lot of dealers around. But as long as you're not in a very rural area, you shouldn't have problems finding parts or service. If all else fails you can order just about anything you need from
www.AF1racing.com
I'm definitely biased, but it seems like most people who've ridden both prefer the Aprilia RSV Mille to the RC51 SP1 and RC-51 SP2.
Here's some comparisons. Consider the source, but I think its much easier to find someone on an Aprilia board who's ridden the Honda than someone on a Honda board who's ridden an Aprilia.
http://www.apriliaforum.com/forums/s...highlight=RC51
http://www.apriliaforum.com/forums/s...highlight=RC51
http://www.apriliaforum.com/forums/s...highlight=RC51
http://www.apriliaforum.com/forums/s...&highlight=SP2
That's a good Aprilia website. This forum is dead. But I check once a month or so for people with questions.
