When Honda Took a 2 Stroke to Dakar!

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Күн бұрын

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@KRANKiT 2 ай бұрын

Appreciate everyone watching this video! I'm obviously not a chemist or physicist, so if you have any corrections or extra things to mention please leave them down in the comments! Cheers everyone!

@callummalseed7908 2 ай бұрын

Thank you for making great videos!

@gasdive 2 ай бұрын

Patents only last 20 years. Anyone could make this now. I'd love to see a combination of this, with the ditech stratified charge direct injection and a modern version of Suzuki SuperLube which injected oil directly into the main bearings, then through oilways drilled into the crank to the big end bearings, then through oilways drilled in the conrod, into the little end bearing. Without the fuel washing away the oil inside the crankcase, oil consumption is dramatically reduced, with oil tank fills only needed at a major service.

@metaldog7128 2 ай бұрын

If you the put the Paris Dakar XR650R and the EXP-2 side by side you can clearly see where the big xr got its styling from and frame ergonomics from? So all that design and manufacturing didn’t go to waste in the end! Because Honda still ended up with a desert racing weapon that dominated the baja rallies….. and I believe if they hadn’t of changed the engine size regulations in the Dakar rally it would of been a formidable competitor to other teams? Fantastic video 👍

@humandroid53 Ай бұрын

Excellent video as usual. PS the p is silent in pneumatic.

@constantinosschinas4503 2 ай бұрын

30 years and it still looks better than most "adventure" bikes.

@exothermal.sprocket 2 ай бұрын

Enduro is still a intrinsically different design to Adventure.

@markilleen4027 2 ай бұрын

@@exothermal.sprocket rally isn't Enduro, and the best Adventure bike ever made was the Africa Twin, which is a rally bike

@Thorkell6969 2 ай бұрын

ok granpa

@constantinosschinas4503 2 ай бұрын

@@Thorkell6969 oh we have a ladybug boy here, greetings to your bf.

@Thorkell6969 2 ай бұрын

@@constantinosschinas4503 what does that even mean

@anchinkan 2 ай бұрын

Dude, you made my day! And you did your homework well, this I can confirm, because Yoichi Ishibashi is a close friend of mine and I was partly kind of involved in this project. I almost got a job as monitor-rider for the EXP-2 as Yoichi suggested me at this time when I was living in Japan. Unfortunately, Honda decided against me. As you mentioned, the project was too late and it was killed due to various reasons. Cost, strict laws and - most of all - Honda´s decision to quite 2-strokes once and for all. Yoichi told me, that he´d quit if they really go for it. In the end, he carried on for a couple of more years and developed the 1000cc and later the 800cc V-engines for moto-GP. But his heart was still with the 2-strokes. At the time I was in Japan, he once visited me and gave me a prototype cylinder for my CRM250 (non-AR). Even that cylinder made the engine running very smooth and more torquee. Later, I got the derivate of the EXP-2, the CRM250AR. And that was a REAL revelation! I almost puffed out no fumes at all, produced a healthy and torquee 40hps and was incredible moderate in oil and fuel consumption. Image that: with only 1L of oil, I could run over 1000kms! Later, I imported these machines to Germany but apparently nobody understood or appreciated the real value of this technical gem. I will forward your excellent video to Yoichi and I´m sure he´ll like it. Thanks again for your good work man! Best regards from Germany.

@ole-martinlundefaret5876 Ай бұрын

I remember this bike - the hope was for two stroke super bikes.

@KRANKiT Ай бұрын

That's so cool, glad you found the video! That test rider job would have been pretty sweet I'd assume...

@captainknoppers4806 Ай бұрын

Thanks for sharing, this was very interesting! Also best regards from Germany

@anchinkan Ай бұрын

@@KRANKiT you bet! At least I did ride the CRM250AR a lot and according to Ishibashi-san it’s the same feeling as on the 402cc EXP-2 (probably not as torquee but as a rider you get the gist)

@nicozimmermann8672 Ай бұрын

you legend man!!! I ride a VFR800Fi so i appreciate Ishibashi´s contribution to the V-engines a lot.

@chipnovelo4817 2 ай бұрын

Great videos. Keep it up. I am 59 years old and have been racing/riding since 1970. I dig you stories because I was active when all the bikes you talk about were new and being raced. Brings back great memories.

@ahsnap9103 2 ай бұрын

Riding longer than you are alive?

@Sam-zc3oe Ай бұрын

@@ahsnap9103haha

@Sam-zc3oe Ай бұрын

@@ahsnap9103he would have been about 9

@ahsnap9103 Ай бұрын

@@Sam-zc3oe 54 years since 70 so he would have been 5 years old when he started racing to be 59 now.

@laius6047 Ай бұрын

@@ahsnap9103 what's so unbelievable? There are plenty of people who started at 3-4 years of age. My friend has two boys and he bought them quad bikes at around 4-5years old. Nothing special

@Jungleland33 2 ай бұрын

I remember reading an article on this very bike back in the day. The 2T engine was so efficient it's emissions were on a par ( if not better than) with a 4T. It was supposed to be the saviour of the 2 strokes..........and that's all i heard about it. To me, the 2 stroke engine is the heart and soul of motorcycle racing and it's a shame to see its demise.😢

@duffbiker 2 ай бұрын

people forget Suzuki had production EFI two strokes in 1993 in arctic cat snowmobiles that even went battery less in 1996. from the mid 90s on it was bulletproof reliable too

@soggycracker5934 2 ай бұрын

The crazy thing is, banning 2-strokes stifles improvement. Vespa made CLEAN 2-strokes. Yeah? Right? No, they really did. SO, it's possible to make them cleaner and more efficient, while keeping the benefits.

@capricousfort 2 ай бұрын

We have the tech for much cleaner two strokes than what we had in the 80s/90s. Fantic make a Euro5 compliant 50cc.

@BoultonPaulDefiant 2 ай бұрын

The Hi Per 2 saved 2 strokes

@Mr10usdad 2 ай бұрын

My main rider is a restored 1995 CR250.

@2smokejoke 2 ай бұрын

This guy knows

@LEEROY_UK 2 ай бұрын

You can still buy KTM/HUS/GasGas, Yamaha and Beta 2 strokes in the US so I wouldn’t say they are banned tbf

@freetarzan 2 ай бұрын

Great videos, I wish you more recognition because you deserve it man

@RobsNeighbor 2 ай бұрын

I love Two Strokes!

@bertbroeder1832 2 ай бұрын

I owned and ride plenty of motorycles of all kind over 42 years. If you ask me, one wish free? EXP-2. Love that thang! Don't know, just love it! Thank you very much, you found pic's of videos I never have seen!

@erichansen8268 2 ай бұрын

You can get a CRM250AR in Japan for about 500,000 yen.

@PaddyFromPaddistan Ай бұрын

@@erichansen8268I got mine in the UK for around £2500 I don't know if that's a good price or not but I was desperate for a 2 stroke at the time so that's what I paid.

@z50king29 2 ай бұрын

I thought you were going to say 50 pounds and I was like, "Wow, that's crazy"... BUT 50 KILOS HOLY SHIT

@KRANKiT Ай бұрын

I had to triple check that information too when I first read it

@FreeRideKos 2 ай бұрын

Honda does this all the time. Brings something exciting out of nowhere and then just abandons it. EXP-2, NR 750, the RN-01 downhill bike even the RC211V with its five cylinders just to name a few

@exothermal.sprocket 2 ай бұрын

Eicma 2024 they bring out a concept V3 with electric forced induction. At least they are doing something.

@FreeRideKos 2 ай бұрын

Meanwhile the Austrians are producing injection 2 strokes by the thousands...

@mr.2minutes161 2 ай бұрын

i would love to have 2 stroke honda, but damn they pull in and pull out fast where i live so they're too rare now

@jaydensdream714 2 ай бұрын

The oval piston bike was next level

@dartmoordave Ай бұрын

At least the CBX 1000 hit the streets, I had one in '78, UK spec.

@alternativeperception6949 2 ай бұрын

So that was used on the CRM 250AR ( active radical) they were really good bikes

@2smokejoke 2 ай бұрын

Same technology yes

@StefanMedici 8 күн бұрын

Yes. I had a 97 CRM 250 AR. The thing was a beast and reliable.

@jonjackson6245 2 ай бұрын

This bike did the Nevada Rally and the Baja 1000 here in North America. I remember checking it out.

@Erwin-P 2 ай бұрын

I'm quite sure a modern 300 2 stroke could finish Dakar. Sure it needs all the same upgrades as a 4 stroke. But the Dakar being 8000'ish km of open ground makes it ''easy'' work for a 2 stroke engine. I can do these km's on 1 piston in a combo of MX, Enduro, Hard-Enduro and Cross-Country. Surely a raceprepped bike can do that at high speeds and starting maybe 5 times a day. 14 days of say 10 hours make 140 hours of engine time. My piston lives in there for 166 hours now and still going strong. If teams are allowed to do piston changes (wich take an amature about 1 hour, raceteam 20 minutes?) i see no problem at all. Also when tuned specifically for high speed, high RPM output one could tune it very narrow and very efficiënt. In my riding it's not uncommon that my 2 stroke uses less fuel than the 4 strokes.

@blue.dt2000 2 ай бұрын

There is a video on KZbin about a guy tearing down a Ktm exc 300 with 368 hours on the first topend. They last long

@heinschwartz7941 2 ай бұрын

Cool story and great research. Thanks for sharing 🤗

@JosephCowen-fz8vj Күн бұрын

Direct fuel injection is the next thing that will bring back the two stroke, only air is in the bottom end and transfere ports , no fuel is added until just before TDC , no fuel out exhaust port ! Kawasaki future projects has a KX550 T two stroke motor up and running based on the 2004 KX 500 motor and so does Suzuki with its direct injection RM 520 T two stroke ! Better emissions than four strokes and one tenth of the moving parts ! Give Kawasaki and Suzuki 2 or 3 more years and the two stroke is back !

@robertrishel3685 2 ай бұрын

I love the irony of Honda continuing to experiment with a two stroke, given that they were always pushing for fourstroke engines. Just to be clear, two strokes were NEVER “outlawed” in the US. Especially for off road use. They may have been out regulated, and they certainly were outpoliticked, but never out lawed. Manufacturers made the choice to stop importing them into the US, as keeping up with absurd US emission laws became more and more onerous.

@JayCrash450 2 ай бұрын

What would you refer to it as if a state, like California has regulated the 2 strokes out of practical existence. We cannot ride post 2020 2 strokes anywhere but private tracks. While that might not be a technical ban, it’s word play at that point bc that is exactly what California has done.

@Jimmy_Watt 2 ай бұрын

@@JayCrash450KICK OUT the loonies that hold your happiness hostage. I saw the map. Even most of California is red. Good luck.

@mattyallwood 2 ай бұрын

Love your work mate! You are a great storyteller. Keep mastering your craft, I’ll have the pleasure of of watching your productions

@siulgonzalez 2 ай бұрын

Shame on Honda for killing the 2 strokes. Imagine what they could have achieved if they developed this concept with modern technology!

@matmiller5256 2 ай бұрын

Indeed. There is nothing like the sound of a CR 125/250 coming 'On the pipe'

@chadwicksmith4427 Ай бұрын

I'm selling my bike and rebuilding an old carbureted two stroke. I miss them.

@lawerncemiller6557 Ай бұрын

Honda didn't really kill the 2t they were just the first to stop using them the writing was already on the wall ! EPA an AMA killed the 2t !!!

@derweibhai 2 ай бұрын

The efficiency of my Lectron carbed yz125x is amazing. It won't load up. I can rock crawl with it all day, and it can scream. The fuel range is also really good for a smoker.

@jamesfenton7338 2 ай бұрын

A very nice summation of the system, thank you. I started riding 2 strokes, desert enduros. and RD-400, and 2stroles are deserving of a revitalization, CARB be damned. The emission nazis in California will not last, as Ca won't last, it's a bunch of liberal control freaks that will self destruct soon enough. I am a retired Master Mechanic, made my living working for dealers and several independent shops, and I really like your description of this system, I really ate that up. The older 2 strokes that were legal can still be run, providing they survived, I hope to get a 250 or bigger, and take it easy tooling around the hills around here. That RD really ruined me, it's why I am disabled, but I still have the 2 stroke fever.

@AbbStar1989 Ай бұрын

I've watched a couple of your vids now and... subscribed! Hopefully your base of loyal followers grows quickly.

@Toxic2T 2 ай бұрын

Hurts me to the core how the 2 Strokes were horribly killed and forgotten.

@duncandmcgrath6290 Ай бұрын

It’s a shame because they’ve been advanced incredibly in snowmobiles.

@laius6047 Ай бұрын

As a new rider I don't see the appeal. When 2stroke fans talk about "that sound" I don't get it since it's the most annoying sound ever lol.

@ctheo13 2 ай бұрын

Thanks for another excellent video!! I thoroughly enjoy your well researched history lessons. Keep them coming 👌👌👌

@Kevin-ti3rz 22 сағат бұрын

Kawasaki got out of the desert racing game after what happened in Mexico. Factory Rider doing 118 mph . And already had the exhaust valve on it's KX500 . After that year everything was BNG upgrades .( Bold, New, Graphics )

@BoultonPaulDefiant 2 ай бұрын

Another engine that helped save 2 strokes from tightening emissions is the Piaggio Hi Per 2. Genuinely an engineering marvel.

@misters2837 Ай бұрын

It was a technology being developed in several markets, Ski-Doo was developing E-TEC and Evinrude/Johnson had FICHT which can trace its origins to the 1970's - Really the electronic Injected Diesel engines pushed the Two Stroke Direct Injection forward.

@mikeshakespeare7294 Ай бұрын

Thank you. The EXP-2 is one of my favourite bikes.

@Relaxoncommand Ай бұрын

This is remarkable. Thanks for presenting. Awesome the parallels to the stonework on the American continent

@rodneystewart4312 2 ай бұрын

Another terrific story . Well researched and told . Thanks

@Peanutdenver 28 күн бұрын

As a local 450 A mx/sx rider I have kept my 125 even tho I dont race it but because its so much fun to ride and goon around on at a track. Whenever I stop racing someday it'll be the bike I will keep. Any dude who has raced Minis/Superminis will tell you how much fun smokers are to race as a kid...and I wonder what it would be like today if mx and sx stayed with 2 strokes in the AMA and MXGP. How far advanced would they be compared to what we have already...Solid work my friend on this vid

@kua-k9e 29 күн бұрын

I own a CRM250AR and love it. I also went to see the EXP-2. Let me share how ARC feels. AR combustion kicks in when you're running the engine right before it hits the pipe at around half throttle. When the computer determines that the conditions are suited for ARC, a solenoid clicks and the engine makes a different sound. You'll notice an increase in torque and the throttle becomes less responsive. It feels and actually is very lean. The top-end and low-end feels just like a normal 2-stroke. I know a few who owned the CRM250AR and we all agree that the ARC technology in not fully matured. The way that ARC kicked in and out was not smooth and felt like a switch got suddenly flipped. We all feel that if Honda could have kept development going on for another 10 years or so, it could have changed the whole 2-stroke game. When the CRM250AR came out, Honda already knew they could only sell it until 1999. This is because there was a new regulation that killed 2-strokes in Japan that started in 1999. I'm generally not a honda fan, huge respect on how Honda was determined to put this technology into production even though they knew it's inevitable daath. These bikes are really hard to maintain today and I've only seen a couple in the streets in Japan in the past 5 years. I don't usually comment, but this video was a bit personal. Thanks, it was great!

@soggybawsmoto 2 ай бұрын

Automatic like - every time. Always a brilliant delve into the world of motorcycles 👍

@92ford13 2 ай бұрын

Honda needs to make 2 strokes again. I’d might actually buy a new bike if they did😂

@KRANKiT Ай бұрын

I think you're stuck waiting for a while man...

@92ford13 Ай бұрын

@ let a man dream😂 I’ve never had a Honda dirt bike, just KTM’s and one Suzuki. All 2 strokes, but I do love my Honda motorcycles. I just don’t want a 4 stroke dirt bike.

@jeremywhittler8591 23 күн бұрын

Just buy a clean last model CR. I should have never sold mine. The Aluminum frame CR was the best handling mx bike i ever rode.

@Dany_Enduro Ай бұрын

Another handful of interesting information about old motorcycles👍

@schgvrx7027 24 күн бұрын

So awesome how much work is put in every video!🎉

@exothermal.sprocket 2 ай бұрын

Like them or despise them, KTM is the most influential manufacturer doing 2-stroke technology advancement in the modern world.

@jLkm897 2 ай бұрын

Yes best engine in my opinion was KTM 440 mxc it revs higher than 250 and makes 58hp stock. If i find one i keep it. It was only made 94-95. It was best big bore 2-stroke ever.

@dartmoordave Ай бұрын

@@jLkm897 495 was the beast 84/85.

@mike-f7r 10 күн бұрын

I remember Dirt Wheels and 3 & 4 wheel action doing in depth articles with Bruce O. From Honda America. The engine was simply amazing. They got some of the C.A.R.B. rules modified and changed through common sense. Two strokes were such a small part of the air pollution problem. I'm all for cleaner burning engines and this 2 stroke proved (with unlimited money and brilliant engineering) they could build cleaner two strokes.

@WarganetKelasmenengah Ай бұрын

I try to search all of this secret in 4 years in google, wiki,scribd, internet archive and i dont get anything information of this bike technical engine. its interesting to learn how the fuel proagation in the cylinder bang the gas and reducing a half or more emission than conventional 2 stroke. This exp 2 engine is so unique and so misterious like B2 bomber. Honda technology back then was two step ahead than any other competitor of 2 stroke engine. I search it in a year until i found this videos. Thanks dude. 👍 Edit : arggh the extinction of two stroke engine still make me sad. And this engine got forgotten in decades.

@ryangreen1588 2 ай бұрын

More dakar stories❤

@2smokejoke 2 ай бұрын

Great video btw about this bike!!!

@barryphillips7098 2 ай бұрын

I am surprised Honda would send a two stroke to Dakar, i would have thought a good torquey four stroke air cooled would be the way to go ( Honda have always favoured air cooled four stroke and IF necessary more RPM to equalize the power difference ) I like two stroke engines; three moving parts; piston, conrod, crankshaft. NO servicing ( oil changes! And a two stroke engine does not mind being tipped over where as a four stroke tipped over while running NO lube!! Personally i believe two strokes could have been developed further!!!!

@Redmenace96 2 ай бұрын

Hope they didn't trash the winning cycle. It should be in the Honda Museum in Motegi? Have never heard of "Active Radicals" in the exhaust gas. The exhaust valve looks simple and could be more cheaply/easily controlled with modern electronics.

@bertbroeder1832 2 ай бұрын

Winner Dakar Rally 1999/2000 with BMW and 2003 with KTM. 14/4/1970 Saint-Affrique/F, 9/29/2004 Rally Pharao Ride in peace Richard Sainct! Gone to early!

@steveb936 2 ай бұрын

Thanks for that, very interesting

@narcoti 5 күн бұрын

Earned a sub, keep up the qaulity.

@z50king29 2 ай бұрын

Hey, that's Hungry Valley!

@jeffgTrialsBikes 2 ай бұрын

Great video, very informative!

@jeffgTrialsBikes 2 ай бұрын

I have a KTM 300exc and a gas gas gp300 trials bike as well as a beta 300 evo trials all incredible 2strokes, I hope and think the 2 stroke will survive!

@tphvictims5101 Ай бұрын

Sad story. I had a new Kawasaki 3 cylinder 500 2 stroke back in the day. It ran very well.

@jameshatton4211 2 ай бұрын

I personally think that the ARC program CAN be rejuvenated in racing development as some of the F1 development teams have reconsidered 2 stroke development again. I believe Audi have done an experimental 2 stroke Le Mans style of car? I think that Audi put this development on the back burner because they had such great success with their inverted head designed diesel V6 turbo with the turbo mounted central in the V of the motor with very very short equal length exhaust runners and dual EFI throttle bodies on the outside banks of the heads. I think the same development team was used for both prototypes and I think that Audi also abandoned the idea still due to emissions even though the engine wasn't burning oil it was still doing 2 x the combustion and diesels at the time has far less restrictions. The idea audi came up with would mean the new 2 stroke engine wouldn't burn the oil, the oil would be injected using oil squirters in modern turbo charged engines like the Nissan SR20. This would mean that for every revolution a mist of fine synthetic oil could be sprayed up under the piston onto the bore and under the piston skirt so that the rings could be lubricated sufficiently. I think that with a rotary valve or a electronically controlled (actuated) valve similar to the one Honda created could improve upon the power output using a turbo charger at the end of the stinger pipe. Many Snow mobile guys are turbo charging their conventional 2 strokes already, but having the valve preventing unborn mixture being pushed through the combustion chamber under boost. Having the ability to close the exhaust port allows the engine accept boost in the most normalised way? Turbo charging would definitely make up for any reduced performed of the ARC system (in comparison to stock 2 stroke). I think the combining both of these developments could revive the 2 stroke era again. Here's hoping the world wakes up and realises we are being scammed into thinking that combustion engines are melting the polar ice caps! It's the sun dammit! I know because I'm an environmental scientist. Burn all the fuels!!!!

@Kevin-ti3rz 22 сағат бұрын

That was the time California started putting Rangers and Highway patrol officers at Dumont Sand dunes . My friend on his CR500 and I am on my KX 500. The giant Dakar bikes getting stuck in the sand made me ask why . Government regulation Kawasaki had the kips exhaust valve. The plus was my KX could over rev the CR

@doncarlo5 2 ай бұрын

the answer is quite simple: two strokes are cheaper and esier to build and modify 4 strokes need more parts … are more complicated and more expensive … there is much more money involved in 4 strokes than in two strokes, that‘s why two strokes are gone and gone for ever …

@sergiorg222 2 ай бұрын

Great story!!!

@jeanlawson9133 Ай бұрын

Give us back our two strokes.....❤

@annmariebarsanti1906 2 ай бұрын

Watching a KRANKiT video is like taking a Master History class in Off-Road MC riding! Thank you Professor!

@KRANKiT Ай бұрын

There's no diploma for this course though :))

@vaughndrew852 Ай бұрын

Well that makes me understand why the xr650r was so bloody good

@finnenjr 2 ай бұрын

lock at evenruds last 2t outbord engines.

@turbomustang84 3 күн бұрын

I always thought running a two stroke on alcohol and just normal two stroke oil would have to be cleaner than a gasoline four stroke but never got around to trying it

@jmanab5438 Ай бұрын

2 stroke innovation will continue. Look at mountain sleds, 850 twins with a turbo making 185 hp stock. Run them pinned all day.

@eroffroad5438 Күн бұрын

I nearly bought a CRM, but no salesman came to sell me one, so I walked out and bought an RMX instead.

@errflow Ай бұрын

well done. cheers

@mikrotronix 2 ай бұрын

i would kill to have that Honda in my garage!!! 🤑

@sandysmith7485 Ай бұрын

You can still plate a 2 stroke in the USA. My KDX is plated.

@JAKDRZR 2 ай бұрын

So how does this differ then the exhaust valve’s in snowmobile engines in the 80’s?

@KRANKiT Ай бұрын

So... I'm not exactly sure on the snowmobiles, but the exhaust valve isn't the innovation here. It's just part of the innovative system. Having that valve was not new, but the way it was used was new.

@gowengetter4599 2 ай бұрын

I own a Honda CRM250AR. It has a similar engine - ARC at low RPM

@Adideva01 Ай бұрын

Nowadays there is BIODEGRADABLE OIL FOR MIXING, therefore 2T are way more CLEANER.

@Gud-y2s 2 ай бұрын

I'm not at all surprised that Honda scrapped it, because it was lightweight, good power to weight ratio and most of all new and exciting technology. Totally against everything that Honda offroad bikes stands for. No, let's go back to selling 250 kg twins and thumpers from the 80's. That's good enough.

@francescoporcari8597 2 ай бұрын

2 strokes are the best for motorcycle, and Honda's self boycott was a pain to watch.

@TheBlueDogMan 2 ай бұрын

Incorrect. Two strokes are better for racing. Four stroke engines are exceedingly more practical for use on the street. The reason two-stroke street bikes didn’t sell in the United States is people who didn’t like the way they sounded. In the United States, particularly, a nation with a huge car culture, they didn’t like the sound of two-stroke engines. And the four stroke engine was way more advanced and refined for every day use. The manufacturers did extended research and what they found is street riders preferred four stroke engines.

@Mr10usdad 2 ай бұрын

@@TheBlueDogMan Two strokes are better for racing. they are cheaper and easier to work on. Plus they have more power for the same size engine. That is why the AMA will not let 250 two strokes race against 250 four strokes.

@Erwin-P 2 ай бұрын

TPI could render this obsolete. Sure TPI wasn't really good in enduro since it lacked proper fuelling in the lowest of RPM making it harder to ride and more funrable to seizure as an Hard-Enduro bike (wich it was marketed for), that's why TBI was invented. However TPI at high RPM doesn't loose nearly as much fuel mixture as a carb, making it easy to pass regulations. Also works really well on mid to high RPM's. Guess where Rally bikes live...?