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Yamaha shows retro lightweight 125cc motorcycle that gets 220 mpg

By

November 30, 2011

The Yamaha Y125 concept

The Yamaha Y125 concept

Image Gallery (34 images)

Yamaha's press conference at the Tokyo Motor Show today was a genuine sign of the times. Four brand new world premiers were shown. The largest internal combustion engine amongst them was a 250cc model with fat tires designed to go anywhere - the SUV of motorcycles was the claim.

There was also a three-wheeled electric commuter, a fold-up electric pedal-assist bicycle and, wait for it, an 80 km/l (226 mpg Imperial or 188 U.S. miles/gallon) retro 125cc commuter that's somewhere between a bicycle and motorcycle - it weighs just 80 kg and it is beautiful.

Firstly, the I've always been a big fan of 125cc four-strokes - it happened about 30 plus years ago when I was testing a 125cc Kawasaki for a motorcycle magazine and at the end of a week of valve-bouncing and lane-splitting, found I'd managed close to 100mpg for the daily commute. It was around the time of the first energy crisis and I figured that I'd found the answer.

If a high-revving, OHC four-stroke could achieve close to a 100 mpg when being shamelessly mistreated, what sort of economy could it deliver if it were tuned for economy, ridden gently and placed in a suitably lightweight frame?

Yamaha's Y125 appears to answer that question. Modeled on Yamaha's first motorcycle, the YA-1, the Yamaha Y125 is a modern interpretation of that motorcycle. Though the YA-1 was itself a copy of the German DKW RT125 and was powered by a two-stroke engine, I am certain readers will agree the Yamaha concept has faithfully updated the YA-1.

The 1955 Yamaha YA-1 and the 2011 Yamaha Y125, side by side

The YA-1 weighed around 140 kilograms and produced 5.6 bhp @ 5000 rpm for what was at the time, a highly competitive motorcycle not just on the road, but on the racetrack.

The big difference with the Y125 is in the fuel consumption. Yamaha claims the bike uses its "world" 125cc four-stroke motor, though the engine certainly seems to have been lightened and polished and beautified, and heaven knows what they've done with the internals.

The Yamaha Y125 concept

The Y125 uses what is by today's standards, close to a bicycle frame with sophisticated lightweight suspension and similarly, the brakes are also featherweight. The end result is a bike that tips the scales at 80 kg - just a tad more than half the original YA-1's total.

The Yamaha Y125 concept

At this stage, it's a concept but who knows what might happen simply because it's such an enticing bike that takes everything back to basics. Sure, the lights are LED and the rear wheel is driven by a belt rather than a chain, but nothing seems like rocket science - it's just a very traditional basic design updated with modern day computer design and material science, and it is an absolute celebration of the form of the original Yamaha.

The Yamaha Y125 concept

The "world" motor Yamaha claims is used in the bike produces double the horsepower of the original YA-1, so the Y125 will never be embarrassed for acceleration or top speed on urban roads. The 80kg weight will ensure it is far quicker than your average scooter to ride, and the fuel consumption of 80 km/l (226 mpg Imperial or 188 U.S. miles/gallon) is testimony to what can be done when you really want to achieve economy in a two-wheeler.

About the Author
Mike Hanlon After Editing or Managing over 50 print publications primarily in the role of a Magazine Doctor, Mike embraced the internet full-time in 1995 and became a "start-up all-rounder" – quite a few start-ups later, he founded Gizmag in 2002. Now he can write again.   All articles by Mike Hanlon
35 Comments

I really LIKE this one!!!!

DemonDuck
30th November, 2011 @ 06:59 am PST

Thanks for bringing this machine to our attention.

It's great that Yamaha decided to upgrade the classic RT125 design to next century design and components. Seems excellent for urban or neighborhood travel.

Pres
30th November, 2011 @ 07:36 am PST

That Y125 is a stunner. Might even consider risking these old bones on a trip for errands into town on something as trick as this.

Eideard
30th November, 2011 @ 08:09 am PST

I haven't seen the 'world' 125 engine, but can they really shave almost all the cooling fins off an air-cooled motor for all target markets? Even if it's only a 125 surely stationary operation (i.e. traffic) and hot climates would suggest not. Have they shaved them off for the looks of a concept? The left side has none and the few that are present are very short.

RodD
30th November, 2011 @ 10:29 am PST

WOW I want one-or three! Please make this bike Yamaha-smart stylish and efficient-YES

You could make an electric or hybrid as well!

zekegri
30th November, 2011 @ 01:12 pm PST

It is a really nice looking little motorcycle. Not sure about air-cooled but it's still pretty slick!

fenriq
30th November, 2011 @ 02:59 pm PST

Finally! Hands up which guys have always wanted to do the right thing by switching to a more enviro friendly commute, but didn't want to look like an Asian girl. Thanks Yamaha for giving blokes a proper looking bike, that you can throw your leg over, without the weight and ridiculous horsepower that has become standard on motor bikes. Definitely on the right track.....but if youre going to do retro......do it well and expose more of the beautiful engineering......don't cover it with plastic futuristic shapes that you entrusted to a work experience kid. These flowing, cg'd shapes are a dime a dozen on online design forums and anyone can make them. Ask the same kid to do a layout of a chromed carby assembly and he'd struggle....cause that takes engineering design skill......not just clickin n draggin.

Dave222
30th November, 2011 @ 03:41 pm PST

Yamaha should definitely produce this bike. It is perfect for both developing countries and developed countries that really encourage low fuel consumption forms of transport.

There are lots of people that wouldn't consider riding a bicycle (too slow in traffic/hard up hills and long distances) but would happily ride one of these and easily use less fuel than many motorcycles and cars.

Oztechi
30th November, 2011 @ 05:03 pm PST

Now if only a mass market version were made and it didn't cost $20,000 in Australia we'd be set.

I've looked at plenty of fuel efficient, light commuters but they are almost always too expensive. I bought a '99 Honda ST1100 for $3,500. It isn't the world's most fuel efficient, but it is big and powerful and cheap. I checked out the commuter bikes and you have to start at $4,000 and go up from there. Too much for a glorified pedal bike.

Maybe I'm just grumpy, but...

Scion
30th November, 2011 @ 05:41 pm PST

I don't own a motorcycle mainly because I'm not all that good at driving one but since the weight of this bike is just 80kg it makes me think that it would be pretty easy to handle and it has very good power. If they did produce it and the price were right, I'd seriously think of getting one.

Dana Lawton
30th November, 2011 @ 05:43 pm PST

Now if it had a set of pedals to go with it as well......

A wide ratio 6, 7 or even 8 speed gear box.

A deep, extra low first, and a flat road, no head wind, lay flat along the tank over drive......

Mr Stiffy
30th November, 2011 @ 06:43 pm PST

@ Dave222

Spot on comment. +1

John Munoz
30th November, 2011 @ 07:12 pm PST

Want, want, want, want.

But wait a second, 80kg = 176 lbs for basically a bike with a tiny motor on it. Seems a little heavy to me, checking goldenmotor.com they sell a 1hp electric bike that weighs 27kg including motor + battery.

Grunchy
30th November, 2011 @ 08:28 pm PST

Wicked concept alright. Production bikes never look like their free-thinking design studies, for functional, compliance and conservatism reasons.

E.g. the muffler looks super cool and allows the floating seat (although the pillion extension looks precarious) but would superheat the engine and the passenger's right foot :)

Agree with Grunchy that 80kg/176lbs is not as "featherweight" as its described, but its in a different league to a 1hp electric with small battery hence small range.

This 125cc 4-stroke will be 8-10hp and the gallon or so tank will go for ever if the range claim is true.

Would have to be injected if so, because the true "world" 125, the Honda and Honda-clone Cub/CT125 still being made in the millions worldwide, is rated at about 120mpg at 30mph.

I'm biased but an interesting comparison would be the FX Bikes street legal Dual model at 57kg / 125 lbs which uses the CT-based engine range. http://www.fxbikes.com Only 1 seat tho :)

Mike Hodgkinson
30th November, 2011 @ 09:11 pm PST

Remember the mopeds? 100+ MPG but had about a one pint gas tank. Lets see a 100+ MPG bike with at least a two gallon / four liter fuel capacity.

What good is higher efficiency if the tank is so small you can't run further between fill-ups?!

Gregg Eshelman
30th November, 2011 @ 10:55 pm PST

DEfinately a step in the right direction; could still be improved with hybrid electric motor in the rear hub, 300mpg? Imposible? It is an opinion:) I would definately consider buying one with right price after so many years of not riding.Very sensible.

b. ozar
1st December, 2011 @ 03:50 am PST

what a beautiful motorcycle! I love it! Too many modern bikes hide their engines under easily broken, expensive to replace plastic. How refreshing to see such a classic motorcycle design aesthetic.

rudedog4
1st December, 2011 @ 10:07 am PST

Clean simple design, yet masculine. I want one and I image a lot of other people in the USA would like to get there hands on one as well especially in congested cities. So long as it's not more than $3K I see this being a best seller. I hope Yamaha doesn't get greedy and charge more as you can tell by the simplicty of the design that it shouldn't cost much, otherwise the price will condemn demand.

When I saw this my first thought was why didn't I think of that, which has proven as a marker in the past that product will do well.

Matt Fletcher
1st December, 2011 @ 10:27 am PST

Cute but a bad design for urban commuters. Its wheels are too large, no place for a briefcase or bag, no protection from the elements, no protection of clothing from dirt and oil and heat from the drive train.

Scooters are better in every way as urban vehicles providing a sitting down operating position which works better who wear anything other than jeans and a t-shirt to work or school. Scooter designs also make it easy to add a rain cape that attaches to the front of the scooter and provides full protection to the rider(s) - and yes with a scooter, one or more passengers can be accommodated.

With good design the form should enhance the functionality and that is not at all the case with the design shown.

Calson
1st December, 2011 @ 10:39 am PST

I want one right now as 90% of my current riding is commuting without exceeding 60kph... It would be great to replace my 60mpg Honda 500 with this - If Yamaha decides to build it, I will order one instantly!

RXTR
1st December, 2011 @ 12:02 pm PST

Brilliant in both design/styling and construction - light enough to be really easy to handle, and simple to maintain. As a former motorbike and bicycle commuter, this concept has tremendous appeal. Why lug round up to 200 kg of mechanical/electrical complexity for a 15 minute commute at 50 - 80 km/h, when 80 kg will get you to work and back again just as fast.

Reminds me of my dad's old BSA Bantam 125.

And thanks Gizmag for posting good quality pictures.

johnniesazzler
1st December, 2011 @ 05:33 pm PST

they should do away with the electric starter and just put a kicker on it. A 125 would be ridiculously easy to kick start, plus it would reduce cost, weight, and complexity.

rudedog4
1st December, 2011 @ 05:52 pm PST

Nice to see the comments from people at various part of the world. In India these types of vehicles are very common and used for daily commute. Every company makes these kind of bikes in India which are very cheap to operate. The engine variations are like 100CC, 110cc, 125cc, 150cc, 160cc, 180cc, 200cc, 225cc etc, and power range is from 8 BHP to 25 BHP.

I use Bajaj Pulsar 150cc bike, which has power of 14 BHP and its mileage is 55 Km per Litre at the speed of 70-80 Km Per Hour, which is quite good performance., although weight of my bike is 135 Kg.

Jay Temkar
1st December, 2011 @ 09:33 pm PST

@Carson, they already make a vehicle that satisfies all your commuter luxury needs, it's called a scooter! Leave this retro design alone. I agree with others on getting rid of more plastic like everything except the fenders. Just put a little chrome cover on the air intake and give the battery a plain box. I agree with @rudedog4 on getting rid of the electric starter and going with kickstart. No sweat to kick over a 125cc engine! How about we simplify it further and get rid of the rear suspension and go with a REAL leather seat with springs. Build in a small rack in the back so rider can sling a pair of saddle bags on it and/or buy an optional buddy seat that attaches real easy. That muffler has got to go. Put something more sweeping and further back. Keep the price decent and you will have gobs of customers, including me!

Will, the tink
1st December, 2011 @ 10:35 pm PST

i don't like how motorcycles kill you and how scooters make motorists laugh at your or kill you. but i want one of those so bad. yeah i COULD get the same thing from a scooter but that looks lame and i could look cooler on a chopper or a sports bike, but this looks like riding a bike without all that pesky peddling. will the tink makes all the points to make for making it affordable and making me a customer as well.

johnweythek
2nd December, 2011 @ 04:09 am PST

Beautiful bike, the only things i hope are added are a leather seat and a kick-start. Anything else would change the bike too much and it is already awesome. Also is the 80kg dry weight or wet weight and how much can the tank hold? Thanks

Please don't let this just be a concept bike; i want one!

Ariel Gonzalez
2nd December, 2011 @ 10:29 pm PST

Unless this also has some special 'not getting blown off the road' tech I think it will not do well in slightly windy climates.

Billy Wayne Davis
3rd December, 2011 @ 04:01 am PST

lose the whitewalls. raised white letters might work. ?

Michael Taylor
4th December, 2011 @ 03:58 am PST

They oughta put in a supercapacitor for regen braking and acceleration.

Gary Richardson
4th December, 2011 @ 07:00 pm PST

nice. question: emissions controls?

yes, after watching THAT Mythbusters episode, high MPGs isn't enough. I want a scrubber on that lil' bastard.

@Mr. Stiffy:

if that wheel isn't too far off 600c road wheel, it would be easily assisted electrically with just about any of the hub motor bicycle kits already around.

@B. W. Davis.

No more so than a person on a bicycle, and this would be for urban/surface street use. It wouldn't be on many streets a bicycle couldn't be on anyway.

C. Walker Jr.
5th December, 2011 @ 04:58 am PST

The 125cc cycle is popular in Asia but not North America. The Kawasaki Eliminator has been dropped. There is a small but growing demand for high mileage motorcycles. Urban use of electric bikes will grow as prices drop and range increases. Liquid cooled, streamlined 250cc motorcycles are at the front of high mileage touring/commuting at 150 mpg US. Full body reinforced fairings and lap belts can improve safety for both scooters and motorcycles. The best lightweight urban vehicle for 30 mph traffic is the streamlined motorized mountain bike. A 50cc 4 cycle with emissions equipment or an electric motor with supercapacitors would weight 50 lbs and cost under $1500 USD. Mileage should be 500 mpg US. The Yamaha Y125 does turn alot of older heads.

Grant-53
5th December, 2011 @ 08:56 am PST

1 Imperial gallon = 1.20095042 US gallons,how could the US mileage per gallon be less?

tvhome
6th January, 2012 @ 03:53 am PST

I have seen some electric retros similar to this, but this beats them for finish and trustworthyness! How I'd love to put some batteries, an e-motor midship and a set of pedals onto this as a donor! oh yeah!!!

Walt Stawicki
21st March, 2012 @ 03:25 pm PDT

Absolutely gorgeous! Where do I place my deposit?

David Calhoun
2nd April, 2012 @ 10:18 am PDT

Now, bring it in at under $1,000 USD

dsiple
16th July, 2014 @ 09:38 am PDT
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