Two-Strokes: The Complete Overview

[bansheeboy400]

nice helmet man i love it how much it cost??? A LIFE?!!!

[JETZcorp]

@bansheeboy400 As I've explained before, my helmet was 15mi away at my dad's house, and it didn't make any sense to waste an hour going to get it, just for a 15-second ride on pavement at 30mph. Seriously, if you need a helmet to do a ride like I showed in this video, THEN YOU NEED A HELMET IN YOUR CAR ON THE FREEWAY.

[bansheeboy400]

@JETZcorp no cars have safety standards bikes and quads you gotta bail or some shit cause who holds on to a flipping bike not me and im just kidding i got a banshee and i blast around goin 96 all day with out a helmet. helmets are for when u got other riders cuz only other riders crash i cant crash

[JETZcorp]

@bansheeboy400 Cars do have safety standards, but regardless of what you're in, hitting something at 70mph in a car is going to be a total disaster; very likely much worse than if I'd rammed my Husky into someone's truck at 30mph without my helmet. When I'm doing any sort of serious riding, for more than five minutes, I always wear my helmet. That's where I get the helmet-camera footage for my JETZcorpMotors channel.

[bansheeboy400]

@JETZcorpa alright alright im just saying couple hour drive for the rest of your life or death you know im not hating just you never know ya know? what if there was another guy makin a vid for youtube and hes high on meth or some shit

[JETZcorp]

@bansheeboy400 Well, you'll notice that it was in fact a closed course. Fortunately on a dead-end street, keeping people from driving down it for two minutes is extremely simple. In fact, no one had to be turned away, but we had a guy keeping it clear regardless. All I had to do to avoid death was not hit a parked car, and after riding for ten years (at that time, anyway), I was pretty confident I could avoid that.

[EngineeringExplained]

Nice video, like your enthusiasm haha

[TheKawi125rider]

nice video, but u really need to learn how to ride a 2 stroke correctly. U shifted way too fast.

[JETZcorp]

@TheKawi125rider I wasn't trying to get everything out of the bike, I just wanted to show it going through a lot of gears quite quickly. Two-strokes tend to come on the power rather violently, but this one hits the power really REALLY violently, and I wanted to keep both wheels on the ground in the suburban neighborhood. If you want to see a bit more power being laid down, look up some of the more recent videos on my riding channel, JETZcorpMotors.

[TheKawi125rider]

@JETZcorp If u think that husq 250cr is violent, try a modern day 250 2t. Those thing just straight up pop wheelies as soon as they hit the powerband, not even joking...

[JETZcorp]

@TheKawi125rider If the Husky had the grip (it would have, on that pavement) it would have brought the front end up too. It's got ridiculous porting, a very lightweight crank, and no flywheel at all, which all add up to a bike that goes from zero to "Woah there Silver!" in about a quarter-second. It's a very different kind of power delivery to the previous Huskies, which had a reputation for strong low-end and mid-range power.

[TheKtm300rider]

y dont u get on the bike to start it?

[JETZcorp]

@TheKtm300rider Because it's an '80s European bike, and the kick-start is on the left-hand side of the bike. So in order to effectively use my dominant leg, which is my right, I have to stand next to the bike. I actually prefer it to the current style of right-hand kickstarters, because with this setup I can kick the bike without there being a giant bike between my legs. The disadvantage is that if you stall it, there's a couple extra steps to getting it going again.

[Yoshij250GS]

@JETZcorp very nice video, well done commentation and supernice animations first of all :) i have a 81 maico 250 (kicker on the left) and getting off the bike to start it up again after stalling is just unnecessary and costs a lot of time. its just 250cc, no need for using your dominant leg. you just have to get used to it, takes 1 day of riding and youll be fine. not only 80s bikes have left side kickstarters, all KTM LC4 engined bikes have the kicker on the left up to 4 stroke 654 cc.

[JETZcorp]

@Yoshij250GS Nice Maico! My dad's got an '81 250 and a 490, and the 250 was able to keep up with my uncle's 430 Husky the last time he took it out. The 490 has literally been ridden only three times (still has stock tires with perfect tread) so it's his one and only museum piece. These days he's been riding his '77 Maico 250, which is just about the best-handing like you'll ever find (better than the '81, he says, because it's so low and planted in the front). Check my JETZcorpMotors channel.

[HydrauIics]

good video man, now i have a better idea what the hells goin on down there

[TS50ER]

LOL, I bet your neighbors love you !

[Jolinator]

that chart is way wrong wrong. you list how a 4 stroke works, but have it wrong, its intake compression, power, exhaust, if you dont have intake first there is nothing to compress.you cant have a compression cycle for you intake the fuel charge, but then after the little pic you go on to explain how a 2 stroke works. 

[JETZcorp]

@Jolinator The chart is correct, however the manner in which a two-stroke achieves the suck-squeeze-bang-blow cycle is different from a four-stroke, that doesn't mean it doesn't happen. There's no such thing as "first" on the chart because each stage is dependent upon the other. I included the chart to demonstrate that the engine had to take in air, compress it, ignite it, and get rid of the exhaust. All engines must do this somehow, and that means two-strokes, Wankels, and even jet engines.

[Jolinator]

@JETZcorp how do you have a power stroke without their being fuel/air in the cylinder? the firing stroke cannot occur before intake charge is drawn into the cylinder. your chart shows the power stroke before the intake stroke, if this was correct where would the exhaust gas go during the intake stroke since combustion has already occured, how has combustion occured since you list the exhaust cycle last then compression cycle but if you havnt drawn a charge into the cylinder you have no bang!

[JETZcorp]

@Jolinator Obviously, the chart assumes that the engine is running normally and completing the cycle continuously, and this is true of any engine as applied to the suck-squeeze-bang-blow cycle. You also incorrectly state that I put compression immediately after exhaust, which if you'll look again you'll see that I did not.

[surlybonds71]

Best explanation of power transfer from the crankshaft all the way to the drive sprocket I've seen. Great job! Especially makes understanding how a clutch works clear. Well done!

[twfxtremers]

tks



[JETZcorp]

@twfxtremers ?

[CoolSypherz76]

Great work

[CRXspeedshift]

Nice video man, thanks for the info.

[jcentertainment2010]

great video. You explained it really well.

[prankmakers95]

this diserves more views and i think you shuld wear you helmet 2 becous you culd die if you dont

[JETZcorp]

@prankmakers95 What you saw in this video was 100% of the riding I did without a helmet. The only way I was going to die in this situation is if one of the wheels fell off, and honestly that probably wouldn't be fatal either. Statistically, you're more likely to die when driving to work than taking a 15-second motorcycle ride on a familiar, paved, closed course. Please remember to wear your helmet when driving to work. You could die if you don't.

[prankmakers95]

@JETZcorp heh i will :D

[Megamilkz]

@JETZcorp trolololololololol

[MadMotor1993]

cheers m8 top video , ur a gd teacher lol : ) iv got a Honda MT50 & A Honda cb125s there both rely gd bikes and i love riding but didn't rely no how everything rely worked cheers ur a big help :P

[todkapuz]

love the mix of animations and real photos.

[ItsMeNickP]

very helpful bro! just got a 1986 yamaha riva (125cc) and was wondering how everything works

[MrCondizzle1]

You're obviously a smart kid, so why no helmet?

[JETZcorp]

@MrCondizzle1 I'm tired of hearing this. There were three reasons I didn't wear a helmet.

1) The helmet was at my dad's house, a 20-minute drive away. That's forty minutes of driving both ways for a 20-second ride!

2) I've been riding motorcycles for ten years, over the sort of terrain that can bottom out all 12" of that suspension. Yet, I only fall about once every two years. The chances of falling down on clean, smooth, grippy pavement are slim.

3) It was a closed course.

[52nos]

this is a very simple dirt bike what abought today's dirt bikes like yamaha YZ's and honda CRF's is the engine also like this but its parts are bigger in size??

[JETZcorp]

@52nos A modern two-stroke is going to be almost identical to this, except they put a simple little mechanism in the exhaust called a Power Valve, and passages for radiator fluid.

A modern four-stroke is a totally different story. They take this basic configuration I outlined, and add timing chains, cams, valves, springs, oil sump, oil pump, and an RPM about 50% higher. That's why the service manuals tell you to do a complete top-end rebuild on them after less than 30 hours of riding. Ick.

[52nos]

@JETZcorp thanx, are you going to make a video for modern four strokes?

[JETZcorp]

@52nos Probably not. They're very similar to car engines, though, so information about how they work is easier to find around YouTube.

[52nos]

@JETZcorp ok thanx for every thing.

[FordsRule351]

man fuck my neighbors.. if i wana ride guess what. I'M GONA RIDE :)

[MrDaBassMan]

That's Satch playing in the background love it :)

[JETZcorp]

@MrDaBassMan I needed a good instrumental, and he's practically got a monopoly on that. :-)

[240SSONLY]

thing a whos its lol das so funny....

[dotcomchris]

kool vid

[shammon1]

Great, simple and clear way to show how its works. :)

[josephvs]

well done! made me understand how the clutchplates worked btw im actually born in Huskvarna(where the brand name Husqvarna comes from) its a small town in Jönköping, Sweden. kudos

[roboman79]

Well done!!

[JETZcorp]

Thank you. :-)

[RockyMountainATVMC]

Well done!

[JETZcorp]

Coming from the RockyMountainATVMC channel, that's a big compliment. I just wish I'd found your videos to reference when I was making the 3D stuff.

[jenzezo]

nice work jetz, much appreciated here... A+ for effort...let the hood have it!!!!!!! haha

[pain423]

Great video m8!

Well done!

[Sbafokkio]

great animation about the clutch I was always confused on how those plates moved, but this made it completely clear.. Awesome, thanks!

[gammafboi]

same with me but now i no too :)

[myersnol1]

Wow. That explains so much! U guys rock

[Lattmyons]

thanks man that was very informative! also you did great on both the animation and the motorcycle... did you make the motorcycle as well? BTW you might wanna put a new exhaust that is a little quieter for your neighbors

[JETZcorp]

Nah, most of them love it. Besides, having the packing removed from the silencer allowed this bike to be rev higher and faster than it could before, and increased power throughout the rev range.

Also, this happens to be the quieter of my two bikes. The other bike runs a straight stinger.

[tobyeo]

Great Video and the animations came out real professional looking, can tell it took some decent bit of time to make those animations

[JETZcorp]

The hard part was getting it to work in sync with the video. All the recording and cutting and trimming and dragging and previewing - bleh. Like I've said below, though, the 3D stuff is part of a separate school project so the video-specific effort really wasn't much. The 2D thing is, as you can check for yourself, taken from Wikipedia (the almighty giver of information).

[bobbyt2012]

Did you make those 3D CAD drawings yourself?

[JETZcorp]

Yes, I made those in Autodesk Inventor for Mechanical Design class. I don't think I've ever gotten so many points for a single project before, considering they helped me get over 100% on this video assignment. ;-)

[bobbyt2012]

They were really good. How long to you think they took you to make? I have a little experience with AutoCAD 09 and SolidWorks, but haven't done anything to that scale. Nice Work.

[JETZcorp]

I couldn't tell you how many hours I've spent on it, but I've been at the project for just about a month now. I've been working on it at home, too, with a 30-day trial version of Inventor 2008. I'm glad it didn't run out before I had to make this video; that would've sucked.