Seeing that this is a 2 stroke, i think an expansionchamber for each cylinder would greatly improve performance and rpm limit on this pocket rocket. Awesome build 👏

Being precise enough in your work to weld together two crankcases and two crankshafts, and get away without needing boring of the crankcase for alignment is mighty impressive. Nice one!

Allen Millyard would be proud. He's the only other person I've seen saw a crankcase in half and not turn it into scrap!

Cutting and welding two crankcases and two crankshafts together is impressive in itself let alone with a little help with a lathe and press not having to bore the case, using a rod the same diameter as the crankshaft to perfectly align the crankcase’s while welding was genius

Absolutely the finest art of knowledge, to build (or rebuild) an engine. When you look at a video like this, it looks decivingly simpel to to do something like this. But dont be mislead, only a few hundreds of a millimeter wrong messurement, or a few degrees wrong on ignition and the engine would be useless. You, Sir, are a true professional.

Very cool project, interesting build. I have a 2004 MotorHispania RX50, thing is considered a 9/10 scale crotch rocket. It has a 50cc liquid cooled engine that turns 15krpm and supposedly makes 7hp. It has 6 gears and a clutch. It won't do a wheelie easily but it does take me (250lbs) up to a max speed of 71mph, downhill, with the wind at my back. Regular riding I never usually go over 55mph

That was badass. These are impressive little engines. 4.75hp and it fits in the palm of your hand. I think your engine deserves a gearbox of some sort and a top speed run. Im also curious how well the pull start survives, pulling over 2 cylinders

Excellent Engineering..with some more fine tuning that little mini should turn out lethal to ride👌👍

Very nice build. Reminds me of a Yamaha YSR50 that I put together with a 200 cc CS5 engine. Cleaned up the ports and made some expansion chambers. When I was jetting the carbs and getting the gearing right it would carry my 240 pounds at 85 mph. It was stolen before I finished it.

Your skills are unmatched by 99% of small engine builders. You did in one video what would take me a year to accomplish. But you crossthreaded the shit out of that first intake bolt 😂

Dude. That was sick. You’re a beast and you made it look easy in the video but only a few people will fully appreciate how much work that actually was. That’s sick. A lil tuning the carbs and I bet that thing is a beast

This dude so talented, hope you have a high paying job with all these skills u own

Great work as ever,definately needs a decent expansion chamber exhaust you can hear it choking as the revs build up.asides from that it looks a hoot to blast about on.

Well, I'm blown away by this gentleman's creativity. This isn't his 1st build. I enjoy watching how things are made in other foreign countries around the world. Apparently, you dont need a state of the art work shop. The editing skills are just as sweet. Nice work 👍 👍

Love the videos! 🔥🔥🔥🔥 Would love to see a 4 cylinder 4-stroke engine to 2 stroke! Maintaining the oil on the pan and turbo 👌👌

Only problem is that since it's still a 2 stroke, it needs an expansion chamber for back pressure to define low, medium & high power bands, if it had one it would be much faster, have more torque & be more responsive, run it 40:1 or 50:1 depending upon your jet size & or squish for the headkit & you can turn this thing into a real track monster!🔥

Cool project. Amazed it ran. Drastically increases the torque of those cag engines but unless you change the gearing or increase the rpms you won't gain any speed compared to stock. An easier project is to fit a bzm to it. You would triple the power compared to the motor that you just created.

In addition to the shock that the creative work brings to me, one detail that touches me is that he darkened the strong light during welding to make it less dazzling. This is actually very important. In some other people's videos, These bright lights make the audience very uncomfortable and quite dazzling

Well done, I love small engines, fun to follow you and your inventions.

Genius you could build your own motorcycle! What is your approximate speed on this piece of art? I’m impressed with your skill and your engineering, great job!

Top notch engineering skills. Definately deserves a new sub!!! 👏

Bro just went from 600rr to a 1000rr upgrade kit for kids!! Solid! 🎉

👏 Excellent engineering.. you are very good at 2 stroke engines, I think it is very powerful. With some more sophisticated adjustments, this tiny mini car would be dangerous to drive👌👍

Please make a V-Twin for bicycle! You'd make the motorized bicycle community so happy!

13:58 the screw on the bottom left still seemed loose 🤷‍♂️. Amazing build btw brilliant to watch

What material did you use for the coupling in-between the crankshafts?

Nicely done. Either you are adding too much 2 stroke oil or need to adjust the floaters or fuel/air mixture in the carbs, it could be scary faster!

That is definitely great engineering.... It's definitely cool to see you got a primeweld tig225x to samtec welder I run myself I got the water cooler and a water cooled torch to trying to tackle the same projects you're doing....😮😮😮 Keep up the great videos and the great work looking forward to your next video.

Do you have the 40mm cylinder or 45mm cylinder ? There are different cylinders avaliable for this pocket engine. you should check and try to install big bore

Ottimo lavoro manuale, ma come pensi che funzioni bene avendo le fasi alternate di 180gradi tra i due cilindri in un unica espansione?il 2 tempi deve avere contropressione nello scarico, quando la camera di combustione si riempie di miscela, come li hai messi devono avere per forza 2 espansioni, anche la fumosità dimostra il fatto che molta benzina non venga bruciata...

So sick!!! I'd love to see you make an Inline-4 with four of those/some 50cc bike engines sewn together. Then run it longitudinally with a driveshaft to a diff/transfer case in the back. Maybe make a pocket quad/mini 4-wheeler that way. That pokemon (pocket monster) sounds awesome as well!

I do not believe I have seen anyone attempt to fabricate (and design/engineer?) an engine block by hand. Astounding.

This is by far the best build video out there hands down..! I am sure this project was nowhere near as simple as your precise editing has allowed us all to enjoy your talented skills and abilities to think outside the box and create such an idea so masterfully.. your talents i am guessing really have no limits and i am now curiously wondering what you might create next.. good luck and good blessings to you and those who support you.

It would be so cool if you could do a 4 cylinder boxer motor like goldwing

This is awesome and excellent machining! I know it’s two stroke but it seems to be very Smokey

Bro , you've given this generation and generations before it who've never thought about doing something like what you did . It's amazing what you just did and it pays to have all the necessary equipment to do what you did . Thank you it's an epic video 💯

Class. It's just the fine tuning and final tiny adjustments and you'll have amazing engines.

Always a nice ride through the Franken-mechanical realm you exist in. Cheers

I am truly impressed by your skill with machine tools there are some home made tools that worked perfectly a true mad scientist

Parabéns , que incrível projetos assim são muito bons , ótimo trabalho eu gostei demais , ficou massa !

Single cylinder 2stroke sounds nice, but you made it 2 cylinder which sounds more amazing.

I don't know much about 2 stroke engines, why is the carb on the opposite side of the crank case from the cylinders? How does fuel get to the cylinders?

Lol, we put a YZ125 engine in my buddies Pok Bike. He ended up having to upgrade the ...Brakes, Tires, entire rear wheel, sprockets, chain, rear shock, gusset the swingarm and stiffer fork springs. Everything was destroyed/worn out in 2 weeks of thrashing. we all kinda abused it to hell and back. Rear wheel bearings GONE twice in a day was when he replaced the entire rear wheel. Pocket bikes dont like 37HP. 250cc motocross engines are way too much,(50+HP) I heard about one, and that it was all tire spin and sketchy. So I kinda like that your build it leans toward sanity, but gotta get a 60cc-80cc 2 stroke motocross engine in there! Youll be amazed what a real performance engine is like. Plus they are basically bulletproof if your not dorky with it and rev it like a spode to redline when its cold, just to show off...🤭🤨and then wonder why pistons and bottom ends never last...dar har har. Not you , many others at the track...🤪

Fantastic work ....... however the external oil seals appear a bit on the loose side ?

Galing ng Hacksaw! Congrats bro malapit kana mag 1M!!!!

Now! Put a regular CVT on that. so it can show its full power! 🎉😊 i love your works! i am always watching your video! From Philippines! 🫰😁 P.S. I also want to see a four cylinder pocket bike! i would love it! 🤩😊

Ok bro, i have a challenge for you. Find a heavy equipment fuel pump. Something off of an old Detroit or caterpillar. I mean, an old alfa Romero spider had a similar setup to what im suggesting but those are more rarw. Anyway, those mechanical pumps, like a lot of pumps, are like miniature engine. Cool thing about the old cat ones is a lot of them are inline 4 cylinders and are exceptionally well designed and made. The rotating assembly might even have the strength to handle boost....you see where im going with this? I know you can get it done, lets see how good you are. Build an engine out of a mechanical fuel pump that doesn't just idle. But will pull rpm and hold up to at least 8 psi of boost. Id suggest running it on pure methanol if youre gonna push it hard. Keeping it cool is gonna be a huge part in the reliability and methanol brings intake air temps down enough to create cold condensation on the intake manifold.

I have an 8 and 9 year old nephew that would LOVE to take a spin on this bike! Well done!

Awesome craftsmanship. I enjoyed watching this build.

4 min in and you had me thinking "Is he making a parra twin?" love it!

Great job ! Double wacker ! Trinidad & Tobago. West Indies.

That's amazing to watch adding a second cylinder but I would think after cutting the block in half then bolting them together would need to be torqued to a certain inch or foot pounds but if it was I missed it.

Great built only thing is changing to 2 full expansion pipes will really help the engine breath at higher Rpm.👍

Right side cylinder, exhaust port does not fully open. Great job regardless

Love it how he shows the wiring diagram like we are going to actually try and build this

both cylingers should have their own expansion chambers / exhausts

next project is the expansion chambers and portwork. just a tiny bit of deburing the intake and exhaust does wonders. add the chambers and it will breath properly . with out them its kind of flat and limited on charging the cylinders, please update me on those tests. it will be twice as fast

Just one word. _________________A W E S O M E S A U C E!! - By any chance could you give some more technical specs? Thank you good sir! Bravo! Bravo! BRAVO!!!

Nice. It would be awesome if you made a V4 with these, like the honda nsr 500. Although maybe this pocket bike is too small for that.

Ja wykonałem dla siebie trochę większą ramę, z tyłu amortyzator i przedni widelec ze sprężynami. Założyłem gaźnik od Simsona.Super zabawa.

It's one thing to own tools,but knowing what to do with them takes skill.Awesome upgrade..👍

WOW, you always build something Awesome. Great work bro.👌👍🤘🔥🔥🔥🔥🔥👌

You should drill bore them plastic carburetor inlets out to let more fuel in. they are always restricted and the exhaust outlets

What did he do to the flywheel? Turned it down to loose weight?

Very cool twin cylinder mini bike engine build 😎👍👍

This guy is always a game of; "Oooo, what's he gonna do next?"

Your "homemade engine build" playlist is hillarious. Engines, engines, engines, ANDREW TATE, some healthcare video, engines, engines

awsome work ! it would be rather cool if you made a six cylinder four stroke bike engine, like the old honda CBX.

Had similar Minibike back in 2008-9, they are fun. Think my model was 14x paid back then 230€ new. It was a nice little thing. Had done bunch of stuff to it. Cyl, Intake, Carb, Clutch, Expansion Exhaust Pipe, Airfilter, Sprocket, adjustable jet, Metall pull-starter. did 70Kmh on GPS with my 85kg on it. Added more strength to frame in the back, Welded a vertical metall bar, from swing up under the seat.

I too believe two pipes would give better prestanda! Expansion chamber on each also seems great!

this is impressive. A real work of art. make a 4 cylinder one next vid;)

Gives new meaning to "Built not bought"!💪

Did you find out the top speed of before and after?

Awesome work ! Can i ask you please the name of your shoes and where did you find them ?? 😁

Superb work :D! I think the weakest link is the clutch not being able to put down the incredible power now, haha ;D!

I was blown away when he busted out the back saw. if he puts a huge rear sprocket on it will probably do a hundred mph

Nice job, brother. And love the scheme of the repsol !!

Two expansion chambers for the exhaust this is awesome my man

Awesome job buddy... As someone else already stated. An expansion chamber exhaust would really wake this thing up.

The stream of smoke behind you. I can hear the atmosphere screaming

That’s so nice!!! I’d definitely buy that

You should have gone with twin expansion chambers and it would have crazy power band!

Sounds 👌 Twin spannies next 👍 Clever guy 👏👏

NICE!!! might I add..Put sum air in the back tire. youll notice a huge difference immediately

you're really great, keep up the good work!

Did I just watch you build a engine from scratch wow

Pra kna rin po tga Thailand sir grbe sobrang galing mu

Hy it’s possible to have some plan? I want to make the same engine. I’am from Roumania. Great work! 👌

Very kul! A bit less oil in the gas mixture might help as well.

"YoU cAN't jUst wELD TwO enGinEs TogETher!!!"

Very nice...amazing work as always..Make it a 4 cylinder pocket bike..lets see how it sounds.🥰

Either there was a part I missed, but I couldn't see any carburators actually on the engine. Nor was there a gas tank when he started it. Also the fact the bike started straight away after rebuilding it to a 2 cylinder, somewhat strange in my eyes.

I would have turned the cylinders around so the carbs are in the front n pipes out the back. Some porting and expansion chambers would be fun but youd prolly be getting into chassis/swing arm stiffness issues.. I dont know if the pistons would take it but itd be neet to shave the heads bring the compression up a little add some timing and 100 octane 😁

You need a little more back pressure so that it can use expansion chamber to sonically scavenge all the exhaust out of the cylinders that's when it starts to break up when you get to the high RPMs

It's a cool build, but you could have saved a lot of work by just machining a spacer between the 2 blocks, sleeving the cranks 180 degrees apart, and bolting it all the way through. It's only making like 4 hp, it would have held up.

Ciao, tu sei il meglio!!. Se il mondo rimanesse senza corrente, solo VOI SOPRAVVIVRESTE. In Italia si dice: Che la fame, aguzza l'ingegno

WOW !🎉 Absolutely astonishing! Hat's off to a genius.🌞

now do the same thing but with three cylinders, and make a mini 2-stroke triple.

Really really impressive and really really cool 🏁🏍️🤩👍

Sounds great. Cool video