P2 - Found THE Problem! - Now, Onto Making the Most Powerful Two Stroke Ever.

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[@jeffnisly5851]

I love watching your engine design process and it's also fun to watch a man slowly go insane over years

[@Haps_q]

The way I see it this project started out insane and has somehow become more and more sane over time... We are back to 'normal' two stroke engine stuff now xD

[@ACE-xr4jz]

@@Haps_qi agree

[@2StrokeFamily55]

Allahumma shalli 'alaa sayyidinaa muhammad wa'alaa aali sayyidinaa muhammad wasallim tasliima😁😊 Yok Tobat Kawan Dan Jangan Lupa Sholat Dan Sholawat😊😁

[@BoB-Dobbs_leaning-left]

@@2StrokeFamily55 Indeed.

[@2StrokeFamily55]

@@BoB-Dobbs_leaning-left Allahumma shalli 'alaa sayyidinaa muhammad wa'alaa aali sayyidinaa muhammad wasallim tasliima😁😊 Yok Tobat Kawan Dan Jangan Lupa Sholat Dan Sholawat😊😁

[@AntonHoward-mx9sb]

I'm not sure why I come home from my job as a hands on development engineer to watch somebody else twisting themselves up trying to figure out problem after problem to get to the desired point. I guess it's nice knowing there are others out there into a bit of engineering BDSM. I'm loving watching the progress and I feel a big number coming soon.

[@fabianr.129]

I'm really looking forward to seeing the engine with full power!

[@groenevinger3893]

We all do.. that´s why we are here. Im waiting to see this engine to be supercharged again!

[@mrsnezbit2219]

If he ever finish this engine I want a party with all subscribers!

[@donniebaker5984]

@@OneHappyCrazyPerson so very very true ...alex ls like millions of people who just can not understand how a two stroke actually works .i was very lucky as i look back to 1973 when i went to work for my local honda shop as a mechanic ..at honda they require at lease one person at attend tech school on every model made..if someone does not attend a tech school honda will pull the dealership's franchise .nobody at my shop wanted to spend a week to sometimes two weeks in the R&D midwest Honda training and development center in Milwaukee, Wisconsin that was an 8 hour drive north of my shop...it was the parts man who was my friend who always done the schools for my shop and he had just quit and started his own shop selling Benelli and Ossa motorcycles ''i was 23 years old and single free to go anywhere .this was my golden opportunity more than i could of ever imagined..as i said it was 1973 the year honda dropped the game changer called the Honda Elsinore CR250m , their very first 2 stroke ,.. my instructor was the same man who designed , developed , raced and won the japanese national motocross championship the year before for honda on the RC125 that was honds' prototype by the already world famous motorcycle tuner Hideo "Pops" Yoshimura , himself ..i studied as his apprentice for eight years as we learned together developing the evolution generations of all the Elsinore models to come started with the port induction to reed valve and finally power valves ..there is not one part or phase of two stroke technology i can tell you everything there is to know about and how it came to be with the man himself who started it all back in 1954 in japan of a very famous motorcycle development and parts center known around the world for the fasted moto GP of Europe none other than YOSHIMURA who else would honda hire to build the worlds most powerful two stroke ever..and so it is today,..i can say with all the knowledge of the master that i am one of a dying breed who knows everything there ever was about all 2 strokes taught to me by the master of all motorcycle tuning theory into tuning facts ..and added my 50 years of devoted experience ..i turned 73 years old of september of this year and i am not getting any younger..all i am trying so desperatly to do is give away all of yoshimura 's knowledge that is voodoo and magic..but nobody in this world will listen to me including ol' alex here who claims in every episode "I FOUND THE PROBLEM" i can guarantee you and everyone that alex will never find the problem simply because ALEX IS THE PROBLEM

[@coolhandluke1503]

@@mrsnezbit2219 It's about the journey not the destination, anyways the real milestone is back to Bonneville

[@coolhandluke1503]

@@groenevinger3893 The PIP engine doesn't need it, best left on the brute force I reckon

[@markregler2164]

What ever you do, please don't be phased, distracted or demotivated by some of the comments I'm reading here. The process of development, the trial and error, the frustration and elation are all part of doing something and learning something at the same time. To all people claiming this to be a waste of time or one mans descent into madness - you might need to rethink what it means to live, love and learn. Part of the whole process of growing as a person is overcoming your own boundaries.....but they're his boundaries to overcome as he wishes....let him do it his way! Provide support and share wisdom but don't be all snarky and annoyed if he doesn't listen or wants to experience or try himself.

[@BossGarage]

Amén 🙌🙌

[@lemmehaveone]

Yes, absolutely agree. Keep going Alex, we're rooting for you!!

[@2strokeshrek846]

👍💨

[@crperformancetucker5065]

Man that big pipe sounds awesome

[@emanemanresuresu]

meh

[@11SpeedFreek11]

Your tenacity is something to admire, and you will be rewarded 10 fold for your efforts. That sounded like I read that from a fortune cookie!

[@whipplecreekracing]

Hey Alex! Try blocking the boost port! The angle is quite extreme. I see it is aimed at the exhaust port from what I seen in your CAD drawing. The rear transfers closer to the intake, have a weird angle towards the exhaust as well. I do understand that could create a bad situation where the fresh fuel is being dumped out the exhaust port. I believe it's running better at lower rpm with extreme timing due to not enough fuel in the cylinder. Once you hit higher rpm, the scavenge effect is effected even more. I know the rear transfers should be blowing fuel charge up the back of the cylinder wall up toward the spark plug. The boost port should be aimed at the spark plug. Hope this helps!

[@2smokes]

He blocked the B port to normal angle + C port or boost port is ok

[@henkcox8212]

You have right the boostport should hit the midlle of the sparkplug. maybe Alex has special thoughts why the port is aiming just above the Exhaust-port

[@dangubler8084]

⁠@@henkcox8212maybe to mitigate heat hotspots. You see, on „commercial“ 2-strokes the most common power-limiting factor is exhaust valves overheating. Alex doesnt have an exhaust valve, but due to the extreme scavenge timing and high resonant frequency, I think that otherwise the upper lip of the port could overheat.

[@antoniovillanueva308]

_"That relatively fat tip is what I am after"_ (that is what she said)

[@0JThomps0]

Put a MAF on it just to see when you're drawing more air. You've got too many variables and no data as to whether it's drawing more air when you change things. You can remove the MAF when you're satisfied with flow.

[@BlueOceanDesigns]

I can't wait for the day to start watching your video and you have it all sorted and a massive smile...Gosh, You've been through a lot over the last few years...Keep it up :)

[@donb3882]

It's 4.42 am in New Zealand, I'm watching 😂

[@espenschjelderup426]

It was 16.42 here in Norway when you made that comment 😊

[@hardstile20]

I always watch with subtitles cus my hearing isn't great, but I love it calls it music when the engine is running cus it truly is!

[@canadianoddy8504]

Here is something else I read recently. The TZ250-A Yamaha race bike had a static 24' timing up to 9500 rpm and then it increased to 26.5' up to 10000 rpm. Then 10000 rpm it started to decrease the timing at a liner rate up to 12000 rpm to 15.5' At 12000 rpm to 13000 rpm it decreased the timing at a liner rate to 4' and then stayed there. My money says they did this to keep the pipe temp up because the speed of sound is faster in hotter gases and this changes the tune of the pipe and increases your power band. CO

[@kbootijzer2418]

Hey, i’ve been watching your videos for a while now. Your behaviours remind me a lot of myself a few years ago. In my free time, i’ve built a lot of things (motorcycles, scooters etc.). Just like you, i started collecting a lot of parts and other stuff in my garage, and it became just more and more. One day, i decided it had gone to far, and cleaned up the whole garage. I cleaned all my tools, sorted everything in its own catagory, sold and trew out all the old stuff that i wouldn’t need in the next few months, fixed all small things that bothered me. All by all, just made it absolutely perfect, like in authistic ways. What i’ve noticed, is that i can focus much better on my work and projects and i could think a lot clearer and better. And all the frustration of having to look for things or having to work around stuff just fanished, and it made me enjoy my time in the garage a lot more. I know it might sound a bit typical, but i suggest you do the same with your garage. Sure, it takes some time. But it will be won back afterwards. Just cleaning up when your done for the day takes 15 minutes, and you will come in to the garage the next day feeling fresh, and you can just start working on your project. If you read this, please think about it for a sec. I think it would be helpfull for you, and i think you’ll have a lot more pleasure in your work. By the way, thanks for all the beautifull video’s. I’ve learned a lot from you, and i don’t think i would have had the dream job i have today if you didn’t fire up my enthousiasm for 2 strokes. Keep it up.

[@sfeather7088]

Love It !!!! Can't wait to see how the new exhaust behaves !

[@Altprophet]

This comes perfectly! Thank you for having this ready today. Im cooking and love when you post new videos. Thank you! Blessings from my family to yours and everyone watching.

[@thebigd9989]

I changed 2 days ago the stinger on my tzr 125 and it give it life at lower revs and a better linear power band 🎉 it's insane how much changes a 2stroke with so little

[@TheLtVoss]

Its all about pressure flow and resonace in 2t

[@bradwilsey9426]

You were mentioned in a recent Donut video. They added a short clip of you.

[@Maulzy23]

I feel like we're back on track bro, hunting for that power again, excited!

[@johnpezaris6982]

So glad you got rid of the stuffer (it felt like a mistake when you put it in, and even more so that you left it there), and so happy that pulling it out led to understanding the real problem!

[@martinstgeorge5904]

Did anyone see donut using a clip from 2 stoke stuffing regarding horse power. 👍👍👍

[@PetefromSouthOz]

Hey Alex I see it as a progress. What you are explaining makes sense to me. I did a similar thing with my most recent Pipes when I increased my RGV from 250cc to 300cc. I also learned that simulation software can deceive you if you input "optimistic" Data. I lost power simply because I got the peak power target wrong. When I did a set of successful pipes using MOTA to raise peak RPM. Once I got a good SIM of my engine, I had to keep juggling the pipe dims/timing/compression etc until I got realistic rpm outputs. (it did not give false readings just theoretical outputs way above the physical limits of my engine) After all of that, the pipes did work and the SIM Data lined up with my real world Dyno results. Onward and Upward Pete

[@Synthomania]

Dette er så kult, det! Blir veldig spennende å se motoren med en svanehals som resonnerer i riktigere frekvens😁🏁

[@Automatikvogel]

The best spark plug cap we used in kart racing are the pvm ones. You could lift the whole engine with them...

[@johnnygeorgopoulos4072]

I stumbled across your channel like a week ago and I've now watched so many of your videos lol. I love 2t's, owned many, but I have zero knowledge on how to make more power with them except expansion chambers and fueling.....but something I do know about tuning....if you make a change, and it behaves poorly, you shouldn't go and change something else before reverting that initial change, same with making more than one change at a time, because then you're not focusing on what does or doesn't work, because there's been multiple things changed and can't pinpoint what change did or didn't improve anything. Also highly recommend getting either a notebook or a spreadsheet on your PC/Mac/phone so that you know exactly what changes you're making, what does or doesn't work, and what HP/TQ you're making at what fueling, exhaust, ignition ECT.... that way you can look at what's working and or, revert back and go in a different direction from that earlier point if necessary. Hope that helps 😅 Edit: I also just thought, you're not running anything to read your air/fuel ratio are you? Like a sniffer. And also, you don't try different expansion chambers/lengths/diameters that often.... again, I have almost zero knowledge, but would it not be beneficial to know exactly that your fuel/air ratio is correct so to try something else instead of "assuming" it's always the fueling? IDK, just throwing things out there in hopes to help 😅 Regardless, keep it up, I know you'll get it to where you want it, hopefully sooner than later 👌 2nd edit: ah ha! I was right! It was the exhaust this entire time! 😅 But make a new exhaust.... and run it BEFORE changing anything else, don't change more than 1 thing at a time so you know what's working lol. Also, after the exhaust.... I'm not sure about that entire ignition system, but that's for a later investigation, exhaust now 👌👌

[@matthias4lupe]

Well done, and best of luck with new pipe! With all the hardship, confusion and backlash you experienced, these clarity and optimism moments hopefully feel extra rewarding!

[@SwedenVIrre]

Seeing the results withg the other pipe gave away everything :D I looked at the dyno runs from and saw a clear a consistent powerband was formed, and once it was stayed there the engine was pretty much dailed in for that configuration. A new pipe will change everything again so i'm looking forward to the next ep and crossing my fingers!

[@Chris__K]

Great job! I am looking forward to see and hear it revving 🤟

[@RS-Racer]

I wonder if a spring pop off valve in the exhaust would give a dual size stinger effect. One exhaust with twin outlets. I expect it has already been done just a weird thing to think about.

[@MrJermbob]

Not sure how long ago i told you how to use the lock ratio in the yourdyno software.... At least you are doing it now.

[@2STROKESTUFFING]

😁

[@dominicanwar363]

Re. The small bore stinger tests. I didn't see the rear wheel move, how were you measuring power? Also, not filling the cylinder is usually a mis match of the reflected wave from the expansion chamber. Have you tried to cut the expansion chamber in half and added a collar section to make the volume greater? If you have to advance the timing (that much) to make power, then you are trying to match a reflected wave that is arriving too early. If you increase the expansion chamer volume. the wave will arrive later when the piston is closer to TDC = efficient combustion. OK, saw the whole video now. Thumbs up.

[@2STROKESTUFFING]

👍I didn't even bother putting the bike in gear with the 13mm stinger - it could barely rev in neutral.

[@mwasy2713]

Fantastic Alex - Not a mistake, rather exploring the essential parameter boundaries

[@lozl]

Congratulations! Looks like.aome serious progress is being made in the right direction. Looking forward to the next.

[@EddieTheH]

A 2 stroke exhaust is essentially a pulsejet (with external combustion), they're easy to make and you can try a few designs til it runs at the resonance you want for the bike, then design an exhaust with the corresponding size ratios.

[@matswallsten1628]

Exciting, so much progress! So fun to follow the process of figuring it out, experimentation and eliminating possibilities. Great job!

[@stephenfrancisvoros382]

My gut feeling and what I've been saying about the exhaust, was great to see you finding this out yourself Alex, I can't wait to see the new exhaust pipe, from my knowledge of 2 stroke motors, the exhaust is very crucial on how the motor runs and behaves, I'm so happy to see you addressing this in this episode. I like to think I never make mistakes, but, just turns in the right direction, when I'm messing around with my 2 stroke motor's. Love your work mate, keep it coming 👍😁

[@fordyootbling2189]

At last you have had a good look at the pipe. Good luck now you are on the path to glory.

[@tcrenegade]

This is seriously freaking exciting!!! A lot of people may think this is just another thing that isn't the "fix" but the indication of that dyno run with the oversize pipe shows some tremendous potential when extrapolating VE curves. That cylinder could make some huge power

[@theshippingcontainergarage]

"I'm confident this has been the problem all along"-the 2 stroke docudrama mini series. Lol love your work it's been really fun watching your progress.

[@DeMiAnD92]

Great to see the progress! Hope your new pipe will give you some Numbers that you want! 🎉

[@samh3145]

Hi Alex, I'm sure you're aware you can unscrew the top of the sparkplug to use a different plug cap style....

[@2STROKESTUFFING]

These Denso plugs have a solid post.

[@evilelf5967]

brilliant! i guess we can all agree that alex has hit that eureka moment,i feel very good things coming in the very near future.i hope he gets the pipe this engine needs built and we start seeing him seeing positive results.bravo alex.and if no one has mentioned before,we need a "lets see how it behaves" t-shirt!!!!

[@brunodesousa3772]

Excellent! Now let’s get that new pipe on the dyno 💪🏼

[@Grooty79]

Good to see you looked at the pipe , i had questioned the volume of the pipe but knew you had designed it around your cylinder , good to see one tiny miscalculation leads to the making of a better pipe 💪💪💪 20 hp at the tyre is coming real soon 🙂🙂🙂 onwards and upwards

[@Fk8td]

Now the question with is all the original internal modification being changed was your original engine design better? They do say you can’t succeed without failing. I’m so glad you didn’t give up and I hope this fixes it.

[@mattebigge]

In the dragracing world they clock(shim) the spark plugs, so they are aimed towards the intake. Don't know if it does much, but maybe it's something to consider?

[@Scissors69]

I think that’s the least of his problems

[@vincentmontero7848]

I just love the process the honesty of it all ! Huge fan don’t stop because it’s hard to do ! Love this channel

[@AlienLivesMatter]

Maybe the big pipe is good match for supercharger. Might be worthwhile doing the flow simulations with that in mind

[@mbnr26]

@Donut media's video "How Much Horsepower is a Horse?" has a clip of 2SS at 20:55. absolutely love to see it because 2SS is my absolute favorite youtuber

[@traviswilliams9455]

Thank you for the thanksgiving present! Love your videos brother. Keep up the great work!

[@flakey7832]

I'm so happy that you found out this flaw man! I hope you show us at least some of the process of how you build a pipe

[@slartibartfast2649]

I think the short one was built by someone else for him, but yeah it'd be cool to see it.

[@henkcox8212]

Alex , what if you check when de piston is in the position that the exhaust -port is just closed , and make an adapter on your exhaust-flange and put 8 or 10 Bar compressed air on it , just to see how much air escapes trough the transfer-ports in that critical position with the gudgeon pin.

[@ianhames2465]

Optimism all around now. Brilliant work. Looking forward to the new exhaust. This new pipe will give the confidence of eliminating it from running issues from now on.

[@geirclasen7360]

Really enjoy a fellow Haldenser at work. I saw you in a short clip at Dougnut Media, bisycling on a Dyno ☺️

[@davidsteinhour5562]

I'm so excited for the next episode! It's funny, and frustrating, how a small detail can cascade.

[@MikeyAntonakakis]

That increase in low end torque with that new pipe was IMMEDIATELY apparent, awesome! Can’t wait for the new pipe!!!

[@YRR_J]

Thanks for clearing that pipe situation. In my brain it has always looked weird. I once modified an existing pipe on a Piaggio h2o -engine, where I took a LeoVince Handmade S and first shortened the start of the pipe. I noticed a markable lift at low/midrange. Then I cut the back open, removed the J-looking bent stinger that was inside, lengthened the "back cone" and flipped the stinger to the outside of the pipe. It revved like crazy without the silencer on one test run. I was running a 70cc Hebo Manston Replica with large ports that didn't match the original case halves at all. Managed to destroy two original belts and I wasn't even at the peak horsepower yet, doing around 100 km/h on a Gilera DNA. The project ultimately ended as I ordered a belt that was supposed to fit, but was for the NRG/Runner with shorter variator case. I rode it a few times and now the bike has sat in boxes for almost 15 years. I ported the casings to match the Hebo cylinder but then sold it to some youngster who destroyed it very quickly. Though it could have been because I widened the exhaust port slightly, but I'd think it wasn't that aggressive, possibly more likely to have been an oiling issue if he didn't crank up the oil pump or add oil to the gasoline. In the back of my mind there has been a voice telling me I have to get it back running some day, with crazy power. Just a while ago I spotted one project DNA for a few hundred euros but it was far away and I don't have the space...

[@robivlahov]

100kmh is achivable with stock piagio cilynder, my runner went 120kmh with a dr evo 70cc at 12k rpm,no gear ratio change. the belt would run out of the varioyit was above it on the half pully . matched case and a arow extreme exhaust . now im bulding it but its more ported and it will get a c16 pipe of my stalker, il come back with the resault

[@YRR_J]

@@robivlahov I know. I achieved about 105 km/h (to the original digital speedo) with just the unmodded LeoVince and a Malossi Multivar 2000 (which has just more agressive acceleration that raises the initial RPM higher and isn't as linear as the original). The funny part is that DNA originally came with a restricted 17,5 mm Dellorto PHVA. So what I did was a rejet (I think it had a 75 main, originally 56 IIRC). Also a slight mod to the air box to allow more air in but to also keep the airflow as similar as possible for proper resonating function. That really made it sound throatier but also way more silent than the original exhaust with probably damaged cat (from crappy oil that my dad bought me, that even scored the piston). I remember one night when my friend took it for a test ride and I standed on the side of the road for a long time. Then I heard something coming back, but I was sure that it was not my DNA. It sounded much bigger. When he ran past me I was so happy with the sound it made. Never heard a better sounding 50cc that can achieve 100 km/h. Very under the radar. - I think I ran a 105 main jet with the Hebo and I think I cranked the oil pump up a bit. But memories are faint after the exhaust modding. I did run it with a Jasil Evolution N.G. HPC crank, as one the original bearings were super loose on the crank and I managed to damage the bores on the original crank as well, after one time the variator came loose. I really loved the 2 part head on the Manston Replica. And I think I paid about 175€ for it back in like 2006. It had to be one of the best bang for buck.

[@yelyab1]

Do you ever measure the volumetric flow in of the fuel if it agrees with your suppositions that a particular porting configuration is pulling unburned fuel out of the engine? Just a random thought while I rest my aching back.

[@ericulator391]

5:07 - saved ~$400 on a 17 day rental with Sixt by changing my location to Australia (hope this doesn't bite me in the butt)

[@midbc1midbc199]

Need a bigger pipe for better expansion and proper back pressure to get more oxygen and less exhaust fumes

[@HighDefBNG]

HURAAAY!!! Fingers crossed for you dude.

[@nashguy207]

Looking forward to see how the new pipe runs!

[@slartibartfast2649]

Title change: "Found the 100th problem"

[@Wazaarbazaar]

Progress of a concept 😮

[@RubinsRacing350]

Strokin ain't easy

[@amirbasssystem]

More like 2stroke suffering

[@billrandell4641]

I have often wondered about your neighbors...They have to be the "coolest" of all!!.."EAR" plugs are made of a material called "Energy Absorbing Rubber"..(you know those soft spongy ear plugs)..They cut out high frequency waves (the irritating part)...Their main product, is "blankets" that when attached to "horse shoe" shaped "racks", are placed over "machine's" in large shops, where hearing loss is an issue. If you want to give your neighbors a "solid kindness" I would suggest getting a length of " EAR blanket" and putting it over the Dyno..Your neighbors will probably give you a nice XMAS present for this "kindness"!!..👍👍👍🗽🇺🇸

[@kingcosworth2643]

The blowdown velocity will not continue as the piston drops to BDC so purging due to gas velocity becomes minimal. You are better off making the exhaust larger and letting the transfer ports do the scavenging. There is a balance point where gas velocity in the exhaust does exist and can draw on the transfers and reeds at BDC, but you are better off like jetting, starting with a big exhaust port and transfer entry and working down.

[@IFRYRCE]

This Thanksgiving, I am thankful for a new 2SS video!

[@dantucker4058]

Lol just seen you on donut how much horse power is a horse, 20:55 hope they give you a shout out! Keep up the great work🤙

[@tubestyle]

Just love you videos! The fact you make a own engine with 3d printing was enought to want to know how this ends. Also love to see how this channel growing. Man, near 200k abos. Nice!

[@ik04]

Gordon Jennings taught me all I know about pipe designing. My pipes have always worked extremely well...

[@artthurman3446]

Have you ever considered using a Lectron 2 stroke carb? (Flat slide/flat tapered needle of massive variation in tapers.). I ran those on old Yamaha TA 125's in the late 70's/early 80's, then more recent in Thailand on both 2T and 4T applications. Simple to use, though must wrap your brain around them...like a fuel injection system with no controller. (Perfect for 2 strokes) See you in Bonneville...or where ever.

[@jamesgarrard4361]

Ok also you must realise were you want to create a diffential pressure drop in the exhaust system inluding from the piston onwards a ventury effect will have some positive effects when placed in the correct position ?? think of the ventury as a loud speeker horn ?? flow ,tempriture and sound , particulate matter ( the Medium )

[@robertbekoscke988]

Now I know why I was confused on your stinger sizes. I was figuring you exhaust area was way more mine and my stinger was 16mm I was .7 of my post diameter. I’ve banging my head on the issue of not being able to get above 11000 rpm even with a pipe made for 15000. I’m pretty sure my stock ignition system juts can get me there. Either that or my porting is just not quite there. Super excited to see the next video hope that thing put out some crazy power

[@canadianoddy8504]

Here is something I read recently and it makes perfect sense to me. When you retard the ignition in two stroke engines, the ignition occurs closer to the moment when the exhaust opens. So, you are getting hotter gases into the pipe. Speed of sound is faster in hotter gases. Gases also have more energy, so they leave the pipe faster, giving you more intake from scavenging. This is the first reason. The second one is a little more complicated. The time to peak pressure (after you ignite the combustible) is smaller with higher RPM because of more turbulence in the mixture. At higher RPM the increase in turbulence is bigger, so you have to retard the ignition to keep peak pressure at the same timing. For example (I really think that you need numbers to get any idea): C2/C1 = sqrt(T2/T1) That is, the speed of sound (C) is proportional to the square root of temperature. So, if you have gases at 400 degrees you have a speed of sound of 520 m/s, give or take. Let's say that you have a two stroke pipe tuned to 10000 RPM. Now, we need some clever way to add 100 degrees to temperature of exhaust gas (retard timing). This means that by the empirical relation for CD (crank displacement), which is: CD = (0.012 * tuned-length * RPM) / speed-of-sound. This pipe will actually be tuned to 11900 rpm with 100 degrees more (that is, you keep constant the relationship between RPM and speed of sound in the previous equation). Would you like to displace your power band by 1900 rpm? I think you would. CO

[@Dgvgarage]

Hi You should try making a step at the top of the exhaust to block the flow of gases👍

[@Mech87a]

Since you arent using the rear brake, you should see iff you can use it as clutch pedal insted, then your left hand wouls be free for computer use at all times.

[@game_Tank]

You actually need a metrakit mk exhaust but a bit bigger. Maybe you can find one or make one. Maybe a 125cc exhaust and then adjust it to fit. Important: the exhaust, it must be able to release the pressure against pressure, also important, the length of the exhaust also ensures that your engine block does not overheat if you drive it longer. Nice video it just keeps getting better 👍🏻 Or clean your petrol tank with a cloth Or polish the tank just before the video say that you have 5 hp more speed and that the cause was that therefore the aprilia did not work properly😂

[@pedalcarguy]

So happy to see you make a possible breakthrough!

[@fisshuman]

34:02 "That's pretty much idle" bruh flexing😂 Btw love the content❤

[@malgal8972]

When Phil Erving wrote the book, Need For Speed, he aimed it for the novice motorcycle tuner. A great tuner of the 20th century. You and your video's will be looked at as the defitive two stroke tuning tuning of the 21st century. Congratulations, cheer's, bottom's up you clever man. Plus you make excellent video's.

[@drifttandem7620]

Was thinking about the pipe few episodes back. Exited to see!

[@harryperkins5425]

Excellent video, what a journey. Cant wait for the new pipe next time.

[@joshuaharrison9331]

The pwk comes stock from keihin with a JJH needle, not sure if the china clones actually copy that though. JJS would be much much leaner at 0-1.5 throttle opening like 50% leaner.

[@AMGbuilds]

I been saying the pipe was a problem since before you had the supercharger on it I would always think about a yz85 and it makes 20hp and the pipe is way bigger on them it is a bigger motor but still not much but the pipe is like over twice as big so get a pipe and see what it can do I been waiting for this forever

[@white_mage]

i always stare at the pipe during dyno runs. i feel like a prophet now.

[@jonnyjones7689]

I knew a day like this would come

[@Fk8td]

I’m surprised cause exhaust restrictions usually create less ignition timing but that is in 4 stroke. This may be different in 2 stroke. Also thank you for dong all this testing. I test so much stuff myself in the Civic Type R world. I really appreciate what you do here.

[@StefanKaser-yx7oi]

in 4 Stroke this is because more backpressure creates bigger amount of hot residual gases. Those make the combustion process prone for detonation, hence you need to reduce ignition timing not to destroy the engine....

[@TonyLing]

Great progress. Very much looking forward to the next video

[@mikequesenberry7976]

Just a thought you think the extra rpm is moving more air that's why it needs bigger stinger

[@ultratorrent]

Finally looking at the pipe!

[@Mikehawking-v5z]

Why not use a valve like on the intake side on the exhaust so maybe a turbo could work?

[@jamest.5001]

12:15 cylinder filing, it wants boost , itneeds needs Boost!!..

[@bigmac..]

I had a feeling it would be the pipe length,think I put a comment up a few weeks ago about RC engine's,has anyone designed a variable pipe or could you make one to find that sweet spot???

[@2STROKESTUFFING]

It's not the length, but the volume that is the problem.

[@bigmac..]

@@2STROKESTUFFING ok thanks, could you use two pipes or maybe one different volume to the other and try blend the pressure waves, just thinking out the box..... probably best I just watch the videos lol

[@bossbuick8615]

looking good amazing how finding a problem can be so satisfying

[@Craft5ire]

Now the only thing missing is the speed of the flow of the intake volume into the crankcase, if you can fix this part this engine will be able to take you to a speed of 150-160 km/hr which is equivalent to a 125cc engine. The 4-stroke, 58 mm piston is the engine of the Wave 125 motorcycle that has been popular in Thailand since the 90s.

[@andersson.l.e]

Nice. Now we hope this is the way to go. Thank you for this video.

[@123gtt]

I really hope you’re right! Good luck I love watching this develop, but we all need a eureka episode soon! I know you can do it!!!!! Iv literally just built a new track bike for next season, and the small things would get me down for days! And I mean very small compared to your build. Your a good motivation for people like us😊

[@theAngelofhevn]

Can you please show us a bit about how to calculate pipes now when you are doing it? Just the basics?

[@rotorhead5000]

Ok folks, 2 Stroke Stuffing drinking game idea base; take a shot whenever you hear the following "good enough for testing purposes" , "I've lost x part..." what else we got?

[@zaklinacz_gojow]

"I think this is the problem", "Lets see how it performs"

[@TheNfurter]

...behaves...

[@zaklinacz_gojow]

@@TheNfurter yeah sorry

[@MX-fo2nu]

Very cool ideal, and so many self made cool parts , at one time it will fly like hell 😊

[@bluestripes1]

it seems like you are back on track with a renewed focus, i could tell as soon as you modded that duct and how it responded that your need to work on the exhaust side and pipe and port