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The two stroke is also "suck squeeze bang blow", but usually suck and sqeeze are performed at the same time, and the blow is performed during the end of the bang. Also, the two stroke required more lubrication than the four stroke. Sometimes the blow, suck, and squeeze are combined in a single stroke (not quite sure how Paris manages this, there's probably a video on the subject somewhere on the internet)
I think I need to lie down for a bit...
Well I've clicked right on over to the comments, but only to say that a 125cc bike could never be described as a "roaring, thrusting between-the-legs monster". Annoying buzzing mosquito thing would be more accurate.
If the modermatrix would like to give me a call when the weather is slightly more suitable I'll happily warm up 1000cc of V-twin and show her the difference.
Providing they don't explode into a million bits and that the rider is light enough that is.
I prefer my V4 1100 silky smooth purrrrr. I've had enough of vibey noisy bikes thanks. See when I got a full bike licence I decided, no more single cylinders and nothing below 750 -ever again.
Plus you've got to admit they make a really loud awful noise. Not like a pleasant burble.
Each to his own I guess.
If you want to ride in snow and ice then that's your funeral!
I have yet to find a reliable local source for spikes tires!
I did used to have a 250cc Yamaha quad, that was wonderful in the snow.
As for the Aprilia, sure have, I've ridden a couple. Pretty nippy for what they are, but there is a world of difference between the RS125's 15bhp and 100bhp+ that comes out of a big bike!
a Yamaha-ha-ha...no?
You can go fast by a bewildering variety of oxidising compounds confined in a tight space and ignited beneath your arse. Doesn't make it a pleasure to ride though, just fast. Unless what you like to hear while you're doing it is a tinny commotion like someone else's mp3 player turned up too loud, on the other side of the bus.
But maybe it is also a little suspect to be so turned on by large quanitities of torque..? Still I never saw a 125 blow a big Ducati into the weeds! Damn sure I know which I'd rather be in control of...
Two-stroke engines offer significantly more power for a given weight (at least for racing, where insignificant details like noise and pollution can be ignored). Bigger racing bikes only became 4-stroke about 10 years ago when the rules were amended to encourage the changeover.
And the main reason they produce more power is that motorcycle style two stroke petrol engines are effectively self supercharging*... And my fellow readers aren't the people I think they are if they can't make something out of Paris H and self-supercharging engines...
(*just trust me on this folks, OK, this is not the place for a dissertation on engine design!)
Unfortunately that's also why they are rather inefficient and dirty. The induction via crankcase compression approach forces total loss lubrication, with the accompanying burning of oil and also means they have to run rich as mixture adjustments take a few cycles to feed through to the combustion processes.
Now I am forced to wonder why nobody seems to have taken a leaf out of the two-stroke diesel book yet. Now, we've already seen that electric power steering pumps, electric water pumps and electric aircon pumps can be made reliable. Therefore a multi-cylinder two-stroke petrol engine using an electrically driven supercharger and direct fuel injection with lubrication isolated to the usual engine components should be feasible. Starting would require a slightly larger battery to spin up the supercharger before ignition, but that would obviate the need for the long cranking time on compressed air starters that relegates two-stroke diesels to trains and boats.
I wonder if there's an application out there that needs a small, light, powerful, economical and reliable internal combustion engine that also has a decent supply of volts on tap for startup. Ah yes, hybrid vehicles......
Surprised that I have to point out that, since these are *reciprocating* engines, the total number of strokes is not limited to 2 respectively 4, but rather large multiples of those, such as:
5645386875697852 or even 8769781934538974661478, really depending on how much fuel you can fit in the tank ;-)
What has Paris Hilton to do with this website?! Many, many things.
1. she is a surrogate girlfriend for the more (real) human phobic uber techies
2. a sort of post-ironic mascot for the Reg
3. an excellent source of generally mind-bogglingly dumb news stories
4. a reference point for the "all that is wrong in the world today" crusties
5. half the editorial team (not so) secretly lust after her
Any other addiions?
This website is DEDICATED to Paris, Rafael - where have you been?
And I must admit that my admiration for the lady in question has been enhanced by her apparent siding with us aging strokers. Perhaps she's been persuaded that motorbikes are about power-to-weight ratio and sheer speed, and not about fuel economy, service intervals, or the availability of ashtrays.
Of course, it's possible that she knows nothing of this long-standing and acrimonious dispute between the 4-strokers and the (now delegislated) 2-stokers. But I can forgive her sweet little butt for that. Paris FTW.
Hey, we're talking about bikes here, not cars with two wheels and a roof missing! :-p
Seriously though, nice bike, lovely for a long cruise. I'm just still enjoying the near death twisty experience. When I grow up (if I last that long) I'll buy one, promise.
BTW, I believe the stroke and bore of my two 500cc cylinders exceeds that of your six 300cc ones :-p
;-)
"Also, as of 2012, the 125cc class will move to 250cc engines,..."
Surely if the 125cc class changes their engines to anything other than 125cc's they will cease to be the 125cc class.
And if they do change to 250cc's how will the 125cc class differ from the existing 250cc class?
Traditionally Grand prix racing sizes were 50, 125, 250, 250 and 500. In the 60s, mainly as a result of restrictions on multiple cylinder engines and also because of some brilliant *East* German innovations in two stroke design four stroke engines disappeared from the GP scene.
These days its considered
1) unacceptable to have two strokes and
2) silly that the premium GP class has engines a fraction of the size of the lumbering monsters you guys have on the road.
So what's happening, *very roughly* speaking with *much over simplification* is that two strokes are being banned and engine capacities are being doubled, so what was the 125 class is getting a 250 engine, what was the 500 1 litre and so on.
yours with the 40 year old DS7 250 Yamaha in the garage...
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