Crazy 72 Horsepower 500cc Two Stroke RAW - Motocross Action Magazine

#motocross #twostroke #dirtbike
Motocross Action Rides The 72 horsepower KTX500e two stroke: ONE-THIRD KX500, ONE-THIRD KTM & ONE-THIRD HAND-MADE.
The KX Guru Racing crew built this third-generation big-bore KX500 two-stroke-they call it the KTX500e. Everything about this machine was custom. KX Guru Racing took the blueprint from Sean Collier’s championship winning KX500 and tweaked it to make the power a broader, four-stroke-like powerband. They called it the “Sean Collier Stage 3” engine. They started with a set of TSR crankcases (which included a hydraulic clutch) and a two-piece clutch cover from Australia. The crank was also stuffed by the Rouse family, then sent to Parris Concepts for the induction modifications. After all the crank work was complete, it was mated to a hand-polished Wossner rod. Then, they added a Boyesen KX250 water pump and impeller. Adam Miller built them a custom head for the KX500 that used the KTM radiator hose fittings and re-chambered it to KX Guru Racing’s specifications. A bulletproof Hinson basket was used with all its supporting hardware to support the extreme power of the 500cc powerplant. For the carburetor, they went with a Keihin quad-vent Air Striker and a custom MRE reed holder system for the Moto Tassinari V-Force 2 reed cage. This beast produced 72 horsepower on the dyno. And yes, we felt every bit of it on the track. The eye-watering power was intense to say the least. It was a total adrenaline rush to hold the throttle to the stops heading into Glen Helen’s steeply banked Talladega first corner.
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[@jamesward4893]

I grew up on 2 stroke dirt bikes and there’s nothing else like them, long live the 2 stroke.

[@jamesward4893]

BERSERKER Cracks me up when the 450 four stroke riders that think that they’re all that and get on a 250 two stroke and it scares the hell out of them, never gets old. My favorite of all of my two strokes that I’ve had in my life was my 1985 CR 500R, that thing was a monster.

[@Mr10usdad]

I only have two strokes

[@Mr10usdad]

Honda and others come out with a fuel injected 500cc two stroke with computer mapping and lobby the AMA to let it compete against the 450 four stroke bikes. That would bring some excitement back to racing! It would also help them sell more two strokes.

[@jamesward4893]

Mr10usdad Never happen though, if you have a 250 two stroke they make you race in the same class as the 450 four strokes.

[@billallen4793]

@@jamesward4893 the "AIR HAMMER" ... god I'm getting old...lol...from Wyoming USA 🔫🤠🇺🇸p.s stay safe and healthy everybody GOD BLESS OUR COUNTRY

[@ronniewilliz153]

Big bore 2 strokes get the nether regions tingling.

[@rztrzt]

Yeah they do vibrate a lot...

[@Corteum]

@@rztrzt It's literally a pleasure to ride 😂😂

[@boser1212]

That motor doesn’t sound like it’s even trying. The front tire says otherwise haha

[@jalanihidup6119]

Yeah, effortless sounds all the way

[@ghost-carnage8964]

Def not full rip but still going hard.

[@GyroPyro121212]

For 1, it is almost impossible for even the greatest of riders to use every ounce of power that even a lightly modded 500 puts out. This one is 10 hp more than a stock unit. For 2, a KX500 engine with just a port & polish job, milling of the head, full exhaust, reeds & cage, and proper carburetion can make 72 hp. This one is completely decked out to the hilt. This engine is not nearly tuned to its maximum potential. That’s why it sounds a bit leisurely at times lol.

[@Ivanoskyao]

Big bore. Doesn’t rev that high compare to small bore, 125cc

[@criscross92]

You just can't beat the sound of a 2 stroke!

[@black07rr]

Lex Riordan 🤦🏼‍♂️ bro.....450’s race with 250 2 strokes, this is a 500cc two stroke, sit down

[@black07rr]

Yz450f-48hp Yz250-48hp This bike-72hp Just be quiet

[@HL-lf8zx]

@@black07rr* yz450f=60hp Yz250=52hp

[@Jayberisk3793]

Jesus people...

[@zestooo6932]

Yeah you can

[@996TwinTurbo911]

Love the power, Love the sound. Thank you for uploading Motocross Action Magazine !

[@blackjackzw]

What a machine, would be nice to see it ridden past 1/4 throttle - too much power! 😂 Great throttle control

[@2strokin70]

That sound is...something to behold..and the power unreal..😲

[@SacredKaw]

The sounds of childhood, a basketball through a chain net and a screaming 2 stroke.

[@davepartridge4383]

why doesn't one of the manufacturers start making a 500 2 stoke again? there is a massive market out there for it. not to mention the prestige of having the craziest bike on the market

[@marcusbevz6500]

Dave Partridge regulations i think

[@a.k.3811]

Emissions laws 2 strokes aren’t very environmentally friendly

[@a.k.3811]

Deadman Walking that’s funny because all leading motorcycle brands are based in Japan Honda Kawasaki Yamaha Suzuki. 🤣

[@texasdirtbikerider3335]

I’d buy one

[@texasdirtbikerider3335]

Deadman Walking no I’d definitely ride it

[@Equinsu_Ocha]

A thing of beauty 🤗

[@jessicahayden4522]

Gorgeous. Long live the 2-stroke 🥰🥰🥰

[@terrelmchenry9524]

I WATCHED THAT GO UP THE HILL,NO STOPPING THAT.

[@gophop]

0:26 I've got arthritis just from watching the shock spring.

[@lqchie.]

The people that disliked this video have bicycles

[@dustin9035]

2:24 Suzuki samurai!

[@kollak01]

looks clean too!

[@Webtech30463]

I get to see this bike in person all the time and it’s crazy. The attention to detail is immaculate. It’s kept at the shop that sponsors me.

[@olivertoeknuckle4664]

I still have my 2000 KX500! It's too much bike for the woods where I now live, and I don't care! On the long loamy pulls, it leaves the thumpers behind. You can tell this rider is barely tapping into the throttle. It has power to spare. The coolest thing about riding open-classers? I could do a third gear start and never shift for an entire moto on indoor tracks. Braaaap!!!

[@angusheley6592]

Me read the title: How when and where can I get this

[@robertmiles6492]

Id be happy for that 2 stroke motor sound to be my funeral music

[@kimojon9665]

What a statement, total thumbs up to you bro!!!

[@bsacab]

Hey guys it’s the right video this time 😂, amazing bike I want one!

[@Aint1S]

You saved me the trouble! I was thinking, 500 jug and seeing something different the first go round. The description said they were impressed by the power, this here is impressive!

[@alecwilliams8425]

Love how the bikes barely being pushed yet it's lifting the front wheel and making it to the next corner without even changing gear. 500cc two strokes are the one engine that most people are deadset afraid of pushing because, in all honesty, the low-end power is more than enough to kill you. I can't even imagine what it'd be like full throttle. Fuck that.

[@thegt3clickcrash329]

That's a pretty good track to be testing this bike out at. Sweet vid. Bike looks like it may be real handful

[@turnerrandolph4256]

I'm being an armchair speculator, but the power looks very linear and super smooth! That looks like a very dialed in machine. 2 thumbs way up👍👍

[@rvtssrvtss3630]

I'll bet that never got over 4500 rpms and it toasted that track nice riding too

[@dapointes641]

THIS is the most satisfying BRAAP I have eber heard. Even better than the CR or KX500's. It is perfect. Every Engine component is perfect. All together it's just a pure beauty

[@bradley1995]

You can be a mile away. But when you hear the sound of a full throttle 2 stroke, you know someone is ripping it!

[@rossreeder5865]

I wish they would go back to an open class in motocross. To see this line up next to a factory 450 4 stroke would be awesome. Believe a privateer would really benefit from lighter motor and more Horsepower. Just less power band would make it harder to ride than a thumper. Would be cool to see though.

[@verttisyrjala2897]

Less powerband? Are you sure about that? Because Im pretty sure this thing actually has a wider powerband than a factory 450.

[@caseyanderson7600]

@@verttisyrjala2897 I think he means more useable power band longer and smoother. I get what you're saying when this thing hits power band it's like holding on to a rocket 🚀.

[@verttisyrjala2897]

@@caseyanderson7600 I know what he meant. A 500cc 2 stroke definetly does not have a more narrow powerband than a 450. No way.

[@caseyanderson7600]

@@verttisyrjala2897 I'm not sure you understand what a "power band" is

[@verttisyrjala2897]

@@caseyanderson7600 "Powerband" is the rpm range where the power starts hitting and it goes on all the way until peak power drops.

[@bud385]

That's what a DIRT BIKE SOUNDS LIKE! ::BEAST MODE INITIATED:::::

[@robertrishel3685]

How competitive would this be under a guy like a Tomac or Barcia against the modern lawn mower powered bikes? And who is the rider in the video??? Fantastic riding! Although I seem to recall, even top factory pros used to short shift 500’s. I remember the time I thought I should race one...1986 I think....pulled a new KX500 out.of my dads Kawasaki shop, all 135lbs of me😂😂😂 That bike terrified the shit out of me! I short shifted it everywhere and it was still scary fast! The rear wheel was always breaking loose and/or the front wheel was in the air. I remember going up the hill at Washougal and the the rear wheel was spinning, the front wheel climbing and the thing would actually accelerate!! Compared to my usual 125, which would struggle to not drop gears up the hill, it was a real eye opener! I thought 250’s were too fast!

[@antoniuswidantoa.s3413]

Nice sound..best performance...amazing ride👍👍👍

[@diycnc3442]

Electric start!!!

[@craigbielsky115]

THE BRAAAAP IS STRONG WITH THIS ONE

[@christianturner8106]

That bike looks crazy fast!

[@kimojon9665]

Two stroke sound = total wood!

[@TheRossillini]

Them 500’s just fly man

[@MXRiderFiftyTwo]

KTM and KX .....my fav brands

[@AVPROD66]

Trop puisant ça envoi du lourd 500 k👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼✌️✌✌✌✌✌🤘🤘🤘🤘🤘🤘👽

[@anglegrinderlover994]

Power: yes Sound: yes

[@rcranch3838]

Lol at all the power wheelies that thing is awesome

[@kimpeejaymelaya7001]

Nice bike bro !

[@youtubeaccount9058]

I could kind of imagine some use for this out on the open desert. But on an mx track? How about a snowbike conversion...

[@jeffa.8976]

It would take a hell of a rider to use that power to an advantage on most tracks. An intermediate/Expert rider could use it to an advantage on a high speed sand track though.

[@youtubeaccount9058]

@Mike Lyons Maybe there still are, but of course they weren't racing against 450 4-strokes from 2020 back then. It would really be interesting to see.

[@blackjackzw]

KZbin Account you can imagine the freestyle guys sending this over the massive dunes! It would be epic at full throttle with a paddle tyre. ✊🤟

[@raccoon344]

A company called brc racing makes 500 conversion kits for modern ktm / husky 2 strokes and in the future Yamaha kits, in pretty sure they have a snow bike kit for em

[@discmotoslots]

sick bike!

[@camilojeanjaque6437]

It’s a monster!!

[@kenharty6016]

Nice riding that bike is fast up that hill lol

[@rolandrodriguez3854]

Haha i just saw Gary Jones' Samurai Suzy cruising the pits. Lol!

[@nikmatmanayangkaudustakan7234]

High comp 2 stroke😍😍😍

[@mikemoe7033]

Where's the ktr and brc 500....really would like to see them touch the maico700

[@jeff40]

Rocket man I remember watching the Stewart brother's James and Mostly Malcom bad mouthing 2-strokes and how slow they are but they were talking about the 250 2-strokes and I thought I wonder if either one of those lazy 450 bike racers ever honestly rode or raced a 500cc. or even a 620 or 700cc. smoker? I doubt it because I'm not so sure James could even kick a 500,620 or 700cc. smoker to life. It just pissed me of two pro-racers putting down the same bikes that made them money as well as famous! They were great racers on the 250 2-strokes and also the 450 lazy man's bike at least when James didn't wreck so much! Malcom took a long time before he broke the top 5. The old saying "pride comes before a fall" is quite true with these brothers.

[@ianmangham4570]

72 ponies is AMAZING

[@1Joe-dangerous]

OMG A 500 2 torcker with A Button? That Godzilla was ripping his arms out of his sockets. I don't care what it cost to build, I want one yesterday!

[@asupercarfreak]

bad ass bike !!!!

[@TEAMVISKAT81]

i would like to see some dyno sheet, of that claimed 72hp ;)

[@hughmongous6613]

Didn't bark like a strong running big bore 2 stroke, in fact sounded kinda weak! In my humble opinion.... I suspect they raised the exhaust port a tad too much.

[@ronaldseabury734]

I'll have to agree sounds weak and looks slow.

[@Thomas-eo4mw]

Good bike to start on

[@italia2002italia]

two strokws foreveeeerrrr

[@juliaedan2647]

Two stroke 500cc 😘😘😘😍😍😍💪💪

[@agustinbravo8741]

Good vídeo, i follow of argentina 🇦🇷

[@pentecost66]

I ride a kx500 every weekend at a track in Alaska 2 stroke 500 are endless power

[@baby-sharkgto4902]

Bike is sick nasty af and the dude can ride

[@trinidadsanchez3342]

It looks fun sometimes and to much at others. So much power

[@ghost-carnage8964]

Dude can rip it up

[@MrLeeson660]

Perfection

[@salprestige2577]

Just epic ....

[@franko3006]

was that electric start?

[@jpa1282]

Everyone in the comment section praying to their two stoke gods

[@urbankotto9685]

Those who can master this bikes are few.

[@nyhusdieter4086]

I'm mean ... come on ... everybody throw your hands up ! If you please always wright the name of these " Mr. DirtDevilHandsome Guy " that gave us something we can tell our children .... haha . Tx very much , that was like a ride on a bullet , DAMN !

[@yeti8it396]

Would love to get my hands on this bike .

[@captainsensible298]

lecky bean starter to boot, primary balancer too ?

[@leift70]

Should get someone to race it in 450 outdoors

[@vevohoeyo]

It would get last place finish as terrible power delivery for technical mx tracks

[@leift70]

vevohoeyo of course it wouldn’t be as competitive! But long more wide open outdoors and a good experienced 2 stroke rider would have a blast and do alright. Have you watched the gp dude give up a title just to ride a 1998 cr500? He actually finished 3 or 4 against all 450s! Very impressive and just all around fun to watch. The track he raced it was actually a lot tighter then most of the US tracks

[@leift70]

vevohoeyo “Bradshaw” raced a 22 year old cr500 against all modern 450s. Awesome to watch and he did incredibly well👍

[@Wide000]

@@leift70 But unfortunately broke his 2 wrists recently while challenging Jeff Matiasevitch on a track. Motocross is probably over for him.

[@theslowend6715]

what gear was this bike in 2nd.. 3rd..?

[@billbailey1620]

Is that at the crank.because no one measures or recalibrates for crank horspower.

[@davidd.2840]

2 STROKE 2 STROKE 2 STROKE

[@jalanihidup6119]

Please someone tell me how much its torque????

[@sBoltzgaming]

I’m scared to open the throttle on my 300 half the time, I could only imagine a 500😳😳😂😂

[@bobfine8206]

Looks fun. How about some info?

[@robertococcia9815]

72 hp its a bulldozer💪💪

[@sludge86]

On the brakes more than the gas, it looks like. A flywheel weight would help smooth out the power a little. I wonder how that shorter swingarm works on it?

[@jeremiahfrodermann9820]

I can smell this video the sweet smell of two stroked

[@gruntabro1]

3:24 ohhh lordy what the hell was that haha

[@mrrice1111]

Two stroke racing: hit the power band for as long as possible

[@joshuataaffe7480]

The motor doesn’t sound like it’s in power band

[@anwarfauzi782]

Ngerungokne tok wes buahagia kupingku 🤣😂😂

[@prettyboypops]

it sounds like a two stroke and a four stroke🤔. THREE STROKE!!?

[@johanlindstrom9503]

😅🤣

[@TLMX722]

That means 4stroke+ 2 stroke = 6 stroke!?

[@Wide000]

Just a Big Bore. Still sounds like a 2t to me.

[@Eriu-88-88-]

maybe a lighter flywheel and gear it out slightly. Awesome machine, loved the vid :)

[@bradleymorris8875]

If that thing had a kick starter , dual shocks , drum brakes and conventional forks and it smoked more ....it would be even sicker !

[@KrsMpv]

Its still cool how it is though 😜

[@bradleymorris8875]

@@KrsMpv it is. I edited my comment.

[@ivanmanuele2542]

Noooooo eletric starter!!!🤟🏼🤟🏼🤟🏼🤟🏼🤟🏼

[@JodyDevere_askpatty]

BS, watch the 25 second mark, he hits a button and Badda Bing it starts. I wanna know more about that!

[@alexandertalbot3054]

Fuck that’s sick only even owned 250 two smokes , can’t imagine what this is like to ride

[@Erik-rp1hi]

You guy need to show a start comparison with a 450. Which gives the better consistent hole shot? In perfect track condition, moist, prime hookup material. Better yet moist adobe. I bet the 500 wins. I still have my 93' CR500.

[@billallen4793]

I wish I could have my old big bores back...start in 2nd and pin it once you wouldn't go over backwards if it grabbed hard...lol...oh the memories, wait a minute, I need to get more aspirin...from Wyoming USA 🔫🤠🇺🇸p.s stay safe and healthy everybody GOD BLESS OUR COUNTRY

[@williamfabiano543]

Back in 2000, I had my choice of buying a brand new KX250 or a KX500. I chose the 250 of course and regretted it ever since.

[@jerseyjeeper1575]

So why the re-post? What happened to yesterday’s upload?

[@billsmith9610]

Is this the same bike ? I know the other one had MRC stickers on the shrouds .

[@jerseyjeeper1575]

bill smith not sure now...?

[@Rubeless]

That was a Honda without the gay electric start.

[@billsmith9610]

@@Rubeless The other bike was a Kaw . Must be the same bike but the other one had those MRE stickers on it. Don't know the Honda you're talking about.

[@jro341]

That electric start is not gay.

[@joeantolak4629]

08 crf 450 , 13 crf 450 , 16 crf 450 10 crf 250 but in the winter when the fields are snowy but no frost in the ground I rip a 2010 yz 85 man just carving around a lil snow dirt track it’s like inner child released and riding a chainsaw , thing seriously cuts the dirt

[@brannonhudson6868]

Seems like it would be hard to go fast around a track... since you’ll be flying more often than being on the ground! 2>4

[@iktorn3539]

When she write you home alone:

[@empirecycleman355]

Nice

[@joelfrancis5391]

Had a 380 for a while. That 500 would be fun.

[@kart3527]

we used to build 110hp cr500... outlaw cake carts

[@MrStarlin51]

Is it just me it doesn't sound like a 500 and its seems like he is working it hard just to get it around the track

[@cougar231000]

It sounds rastrained and goes more like 35hp rather than 72...

[@spoolin610]

@Keith Peterson They are lug happy engines, not high revving 125's. Power is down low, If you've actually owned one you would know their characteristics.

[@rickeddins302]

They actually tuned It to be more of a broader 4-stroke like power. Go read about it on their website where they explain what was actually done to it.

[@rickeddins302]

Keith Peterson 😂😂 if you say so mr expert🤣 That front wheel coming off the ground out of every corner says a completely different thing but 🤷‍♂️

[@ironmonkey1512]

Rider obviously not comfortable on the bike and not wanting to crash it. I built and rode a couple cr500 AF so I am pretty familiar with them.

[@liveyourbestlife3785]

No music necessary ☺️

[@craigmarshall3603]

That thing is fucken awesome

[@motolifealways]

Seen this vid months ago, still has either a reed problem or spark issue of some sort. Either way this is a beast of a bike but i feel Kickstart is the real mans dream, not electric.

[@cashmandrummer2917]

Jesus loves you!!!