Total Motorcycle Community Forums

We already know I'm biased here, owning an SV650S - but I'm going to suggest it anyway, especially since it made your list in the first place. I've ridden mine across TN a few times, and it's just loads of fun. Your insurance will be much cheaper, and you'll get a little more range from tank to tank. There is a lot you can do to the SV to make it handle better, etc etc. None of it really needs to be done, they ride just fine stock. Of course, I have moditus and can't leave things stock so I didn't.

I led this guy across GA 190 on Friday. You'll note I said led. You will then note he's on the ninja, and recall that I'm on my SV. (also led was a CBR600RR). In the even tighter twisties you've mentioned, the SV is plenty fast, and very rideable. Yay for torque.

dieziege wrote: The reason that is true is that the air is about 79% as dense as "standard" air.

That's point one... now we get to the mixture being off. Ideal mixture is around 14.7:1 air:fuel mixture. In other words, for every 14.7 pounds of air one pound (sixth of a gallon roughly) of gas is added. That's what your carb is set up for (approximately). Now, this is simplistic... but if we assume an ideal mixture at sea level and an 80% density at our actual altitude, the mixture is going to be roughly 11.7:1 (this is wrong, but it isn't as wrong as it could be).

Ok, not to get into any kind of a science lecture, but I am a little confused as to why your carb is set up to use X amount of pounds of air and gas. I would think that it would measure a certain "volume per unit time" and not weight. Simply because you can adjust airflow and gas flow into an engine with a nozzle. This is why you would have problems with the denisty of the air at higher altitudes or with higher humidity. The same volume of gas is going into your engine, but there is more moisture in the mixture so you are getting less O2 and N2 which gives you a weaker "BANG." Why is it measured in weight? You seem to know alot about this stuff, maybe you can help me figure this out. Thanks.

(Not trying to be pretentious or anything. Just an Aero Engineering kid who gets off on this stuff. )

i can only compare the ninja250 to the zx6r that i rode (don't think it was very stock in it's setup). The ZX was a nice responsive bike, but to me (key words "to me") it wasn't as comfortable as the ninja250. of course it's a lot more aggresive riding position and the clipons were pretty low.

it was a blast to ride but i felt pretty much every bump until i got a bit more comfortable. i bet if i rode it again (thanks to the help from the guys in my post on sportbikes here) i would be a bit more comfortable on it.

from just sitting on the 650R and the SV650 i would rate the comfort of the ZX6R to be less than both of those by a long shot, but then i haven't had the opportunity to ride the 650s yet so who knows, and of course that's just my opinion.

Dichotomous wrote:nitrous does not equal boost. Boost is where you stuff more air into the cylinders via increasing (or boosting) the air pressure coming in. Nitrous being called boost seems to come from two things, fast and furious, and the game "burnout" where captain jackass narrator/commentor says just about everything that game developers think sound cool. anyways, forced induction = boost, nitrous = nitrous

actually nitrous is called nawwwwz.