ltrs can spank piped yfzs with a cherry bomb, lid removed and spark arrestor out, a 450r is probably better compared to the z400... honda's 450r is reliable, they're like civics since everyone owns one there is more aftermarket support and parts are cheaper. that's all I see good about the 450r... you comparing a 250rs power and speed to a ltr450 is like me comparing my 450s power to a zillas imo... top speed stock on an ltr450 has been clockd via gps over 80mph, how fast does a stock 250r go? how fast does it get there. I'm not saying it's not a fast quad, it's really fast, and it's capable of beating some 450s but make no mistake on which 450s it will beat. you think it'll take a ktm 450sx? go look at the dyno comparisons the ktm isn't much further than the ltr450 in peak and when you add more air and an intake cam the zuki gets MUCH better bottom end and more top end. ported for ported, big bore for big bore the 450 will just keep pulling away, there's a few guys doing pump gas 60+whp on the 450s for pretty cheap. there's a few with race gas that're more there's even a few that run sizeable nos shots. when people tell me they beat this or that locally, I say, well, lets line up. usually they just drop it. I'm sure you're not one of them, but you can get an idea of how my modded intake gains for HP from this dyno
51HP and 35TQ for $250 total on Suzuki LTR450 - LT-R450Central
apples to apples
I have a cherry bomb, 08 header/exhaust (1.5whp dyno proven over smaller diameter head sub 08 exhaust) a bench flow tested modified airbox that flows twice the rate of stock (bought it on ebay actually) a large UNI filter and a trick suspension setup, CCP stabilizer and antivibe bar clamp all help me float thru stuff faster than I could go thru stock pushing myself out of my comfort zone. a stock ltr450 will imo out handle a highly modded lt250r, there's just no way around it... my 250r has a stabilizer and is widened and has shocks, and it has the tie rod flip mod ect and I didn't feel it had comparable handling to my 450 even on the street 250vs 450 mild off road lol
is it fast, yeah, like a slightly toned down shee with better suspension LOL. is it faster than my 450 off road no way in HELL at least not my two bikes. a better 250 with a full JB frame with 250r geometry and long travel ect, yeah, it better be but I still don't think it would have the 50+whp... not as a mildly build machine it won't at least imo...
ah dunno man, seems kinda hard. If the 250r is faster I will sell the 450 and do something custom (suspension geometry) with the 250r as I'd really rather work on a 250r anyway LOL just don't see how it would do better. like I said, it doesn't have the power, nor speed and it can't handle off road terrain as well. so it's just not happening imo you're comparing a 1992 ford f150 to a 2010 ford SVT raptor LOL
my 450 smoked my 660, thus getting rid of the 660, both were modded, the 450 straight up did better hp