Sean Collier's KX500 versus KX450 with Motocross Action Magazine 

Totally agree. I have an '04 KX500 . Bought it new and traded it from my '97 . My new '97 was a trade on my old WR500 Yamaha. That was an interesting bike . Rolling back the years. 250 hours plus on the 500's and I'm the invisible man in his mid 50's with the grey hair wearing the suit working at the local bank. Funny. Must get a hair cut ...

It doesn't just sayin...

mateo floreani if they did it wouldn't be available at your local dealer here in the states. Emissions bs is what's killed two stroke sales here in the us.

ROTAXD bunch of tree huggers who believe anything the EPA tells them about co2

That or the Cr500R

Yeah man

They do KX500AF you just have order it. $10,000

Hey man what's the difference between a big bore and standard 2 stroke?

Jesus Gomez . correct me if im wrong guys but i believe it has two meanings. one being modifications that increases displacement of any 2 stroke engine. two being a general slang term of a single cylinder 2 stroke engine of over 400cc's from the factory .

michael harris Correct

ok thanks man I got a 1989 yz250 and never knew what the big bore meant on it

+Jesus Gomez its not a big bore tho 360 and bigger is big bore

Its not a bike, its a wild animal

Nope not science, just ROCKET. own 5 of these beasts. 87, 86, 89, 89, 89. Yup, I kept bugging shootout used 89 KX500s after I wore out my new in 89 500. The 87 feel off my trailer when only 2 months old. Buddy Kevin Blanding who want racing sold me his 86 for a steal so I could keep going. MJ Pro Jim Kapitan of Pro Pilot Suspension revalved the rear of the 86 and it was phenomenal. Pro Pilot, Factory Connection in the East, Enzo Racing and Dicks Racing on the west. Braaaap on you manly men with hairy chest and linked up forearms. Hahaha 🥰😎👍

How much

ben

+luis trejo Same.

same

Ctnz

What?

😲😳🙄HOLEEEE FAHK...

+tim neaves I am with you on that.....the 4 strokes are too expensive and hard to make as fast as a old old 2 stroke......I raced KX500's for years and they are still too much bike for most 4 strokers....lol

that is a really bad argument right there it is. the 500 has 66hp. and in the right hands, well ill leave that up to your imagination.

Gods Phone is bjk

Who said that they did all that tuning to the 450 to keep up with the 500??? I'm pretty sure there just reviewing this nice man's beautiful bike collection

That 500 is 30yrs old, unchanged since 1988.

Castrol R pre-mix

Steve Johnson 450's were introduced because mfrs needed to go that big to be competitive with the 250 two strokes. You modernize a 250 two stroke (put it on a modern 450 platform) and the two stroke will turn equal if not faster lap times.

Darrell Savage ya, I've seen the dyno sheets and know about the weight differences. That being said, I've seen it time and ahain...450's having their asses handed to them by 250 2 strokes.

Its all about rider ability, nothing else. The debate is old and boring. Power is nothing without control. A kx500 cant win with just power, they are a bear to handle.

@@ROTAXD they still make 250 2 strokes and people race then however the 450 is faster by far hense why everyone rides them

christopher krause first of all, most tracks don’t even have/allow 2 stroke classes here in the ‘states anymore. 2nd of all, you’re right, 450’s are faster...but the 2 strokes are quicker...by far. Last but not least, “everybody” is riding 4 strokes because very few riders today could handle a 2 stroke. The linear powerband of a 4stroke makes it like riding a 70’s era honda cb350 twin (literally anyone can ride one) wheras the lightswitch like powerband of the 2 strokes actually requires an additional skilset that 9/10 4 stroke owners don’t have and are incapable of learning.

Getting more power out of a 2stroke is as cheap as a harbor freight dremel to clean the porting up, some sand paper to figure 8 the head on a flat sheet of glass, reed cage , biggest carb you can find and jet it to match the air in flow, and what ever pipe you like to shape the powerband. If you really want to get fancy split the gear sets and polish them. You now have a national caliber bike.

Jeff Darkness Wdym

the Stock Suspension is Horrible on a bike with that much Power.

Jeff Darkness interesting

gwl78 yeah 500 all the way

Mark - he's ready from a script

dcryan77 I realize that but I know a lot of people who read from scripts and they don't sound like that. :)

Mark - 87y

+Mark - Its like trying to listen to the kid who couldn't read in school.

+Kawi450 LoL

Moi!

Sean's boyfriend/mechanic.

Tec 9 Sean is gay?

who the fuck is sean?

yup. better go pitbiking. even that shit gets expensive!!!!!!

1000€ for a daytona engine and a few 100€ for tuning. every year maintenance..... bye bye wallet withouth sponsor

I hate bikes full of wank, and over done with carbon fibre shit

haha i know. you could buy my cr125 for that fuel tank

shifterkart1 But...but...its Italian!!

+Jaret Boston "Carbon Fiber gas tank"

+Jaret Boston sounds fair, it must be at least 1.8 ounces lighter. plus that extra quart. $250 for a puke can for the radiator sounds like an awesome deal,too. I mean, in 1968 a plastic puke can like that cost $2, so.........

Hey, everything counts lol. I remember kart racing at the local level with $5000 built briggs 5horse engines and $1600 carbon fiber axles.

kx 500 cr 500

that gas tank costes the same as my bike

They could get the 500 to make basically any amount of power you care to name. In road racing they have 250 2-strokes pushing over 90hp, but you'd never control that on the dirt. Based on the power they arrived at and the use of race gas, I'm going to say they put a BIG emphasis on the low and mid-range power rather than top-end.

How much

Opferman Motors Dirtbiking You know full well there is no way the KX500 will leave with real marks above the performance of Kawasakis Super Sized Mc450F with fries and a Coke. Anyone who has done their homework knows 2T make more power than double cc 4t engines. In that homework we also learn that power comes at the cost of being in a typically tight RPM range, making it harder to ride. It's more challenging to keep the RPM matched with the speed you are going when exiting turns, etc. The amazing thing about big bore 2T engines is they actually have bottom end grunt. MXA are friends to 2T as we've seen in the past, but they would never spit in the eye of Kawasaki by suggesting their new Mc450F can be beaten by their 1997 Happy Meal toy, the KX500. In MX, some days the Lights class is setting the fastest times of the day suggesting bike handling has possibly more to do with it than engine power. That is where this Mc450F will have an undeniable advantage, an 18 year advance in chassis setup, frame geometry, suspension development, research and development with top level riders and motocross tracks as riding styles and preferences have changed over time. There's big money in new motorcycles, especially 4T, there's nowhere near the money in keeping mid 90's MX bikes alive. That is why the AMA continues to tie the hands of the 2T rider, and big factories continue pumping out 4T machines. I love my 2T's and I enjoy riding 4T's on occasion, but nothing makes me feel more accomplished than nailing the timing leaving a bowl turn on a wound up 2T!

@@thesickhorseranch1930 An intelligent reply. Nice job. When I was racing in the late 70's thru early 80's, the 125 Pro class had faster lap times than the 250 and open class.

Kawasaki 888 racing ride a KTM-Factory Edition you might think different!!

+dirtrider169 thanks, Al. common sense is not lost on you.

Texas Edge because it's about usable power.