This Part Doubles Power in a Two Stroke! 

5:56 - "finishing with a quick hand job" is why you are always so happy. Well done you!

There's nothing I look forward to every week as much as a new 2SS video.

Love the communication between you and asoftaaja. A real collab with Finland and Norway. Waiting for the IRL meet :D

Larger pulley on the crank means you are spinning the gearbox faster so increasing windage losses. A smaller rear sprocket (or larger front) is likely to yield better results.

I had to come to the comments and say how much I LOVE your background music during the montages! I never would’ve thought that what I wanted in my life was CNC machining montages with various Jazz music selections in the background! Bravo sir! Love your video style!

LOL....."a quick hand job" means something else to us in the UK! :) Great concept.

So glad for the music to be back! Thanks for your dedication as always

You know it's a good episode when the jazz is playing!

This is my absolute favorite series on any platform. It's a treat to see your post weekly!

the first 5 minutes or so with the saxiphone song playing was wonderful! greatly appreciate the ambiance you created there. Thank you for the videos and all the creativity you share with us.

“Finish it up with a hand job” I hope he intended to say that because it was hilarious

its great when "double" and "power" go together

I watched a couple of your older videos Last night, from 4 years ago.. the whole journey that I have been watching since you are casting cylinders yourself in your garage, makes so much more sense now. And it is truly awesome that you got to end this video with yet another win. Can't wait to see the next video

Who doesn't like it finished off with a quick handy!

Ive stumbled across this channel a couple different times, im now subscribed so i never lose it. Your content is awesome and your out loud thought process is super relatable to what goes through my head when something doesnt work right 😂

This was a very nice video! I enjoyed the music and matching screen action!! I got the feeling you had also a lot fun creating this video. Go on mate! You are awesome

Im glad to see that its fully back to experimental, the difference is that its making stuff work before adding more madness.. This truly is the greatest channel on youtube.

Well done. Many lessons learned and lots to unpack here!

amazing video as always i have been following your series of this engine a long time and its great to see horsepowers and i learn new things everytime i watch these videos

Following for years & glad to see you're going in the right direction. Keep going!

SUFFERING IS OVER! To hell with the choked exhaust duct theory. Or it at least needs some further research. The belt drive probably adds at least 5% losses so it probably has already about 15 crank hp. I am eager to see if you can push it past 20 with some tuning. If it now has torque peak at 14K, the potential could be huge.

5:54 anyone else xD

Let us see your inventions in real action on the road please😊

Watching you apply apoxy to your 2 stroke engine reminds me of in 1968 when I was 16. I had a Harley Hummer 175cc 2-stroke bike.head almost no power. we determinede it needed more compression. My father worked on space capsules at McDonnell DouglasAerospace company. He sealed the craft. He brought some heat shield material which is called Avacote. It resists temperature to 5000° F. We filled a portion of the head. It made good power. It only lasted a short while being heat shield it did its job a slowly melted. 🐌

Music took this episode to a new level! The episodes were already entertaining, but with more tunes (pun intended) it was great. 🙂

When I'm in forums looking for advice on my bike, I never know if I'm talking to a guy like this or someone who just learned the difference in 2 & 4 stroke and is really good at BS.

I love this channel. Keep pushing brother!

No way you just said you're gunna give it a hand job!!😅 I love this guy

From Arkansas, i dig it! I repair old outboards!

Good for you man, I like the fact you never give up!!!

Well done. Your perseverance is inspirational!

Love that the jazzy tunes are back ❤️

Nice to see progress, keep up the great work!

Its great to see that all the work is now worth

Well i had my mid 70s rd 50 doing 16000 rpm and just off 100 kph with only 4 mods compression increase , 100cc reeds and carb from a similar Yamaha , cut the piston ports open. Most important i raised and notched the exhaust port. Gas flow is very important must get burnt gas out of cylinder.

The most embarrassing way to lose a race is to leave the line on an empty fuel tank [HOP HOP HOP!] 🐰🐇

Sounds really crisp. Nice work.

So good to see this project coming togheter!!

i love to hear that engine sing

Man, he’s really into this stuff. I’m lovin the jazz you have goin on while you’re doing stuff.

I've been rewatching your videos the last little while.....I was so caught up in what you were building that I never noticed, but your English is so much better than it was a few years ago!

Yeeeeaaahhh, awesome!!! Big thanks Alex!!

Proud of this man. He’s come a long way.

5:55 As an American this has a VERY VERY different meaning. I needed that laugh this morning.

Alex, The machining of the head to accommodate different port geometry is brilliant! The ability to Dyno a series of runs, document the test, then remove the current designed port and install another slightly different is just dam smart thinking outside the box. It is always about, just one more thing, that you surprise us with! You need to get a printer or interfaced program that can document gains or losses for comparison. You have created a Engine from scratch and taken us along the journey, this is why your videos are so good, thanks. I understand, a couple of ice cubes and 3 fingers of Jack Daniels, can make a great idea....Futuristic...in reality!

I carnt be the only one that said hello an welcome back to my garage 😂

I finally understood everything when he said we’re on the right track

Awesome win my friend… love the videos and your determination..

I just want to see this thing driving on the road, just a little bit

The best thing every week man.

This is definitly a WIN !!! Good job !

Great video as always. Might wanna check your rear wheelgear because i saw some sparks flying of of it.

Finally we got the results 💯, now it's on to the testing and tuning

You have been my professor with two-strokes, especially hotrodded two strokes. It's been fun for a four-stroke guy: all new stuff.

This was Cathartic - lovely music and Milling after a crap day.

Awesome! The motivation you needed, so good to see something going well for a change, definitely a win 🏆 Look forward to the next one 👏🏼👏🏼👏🏼

ITS ALL IN THE MACHINING COOOOLANT !!! ITS LOOKING SMOOOTH !!!

Heck yeah!!!! What an difference, way to go!!!!

Volviste amigo, ya extrañaba tus videos 💪

Well done continue to move forward

Yes! The music's back! Thank you

Just so you know, the whole interwebs is rooting for you.

love this channel, this is all I did when i was from 13 to 18, started on my aprilia replic 50 and than graduated on the cagiva mito 125cc. I managed to get in to the high 30's hp, with malossi and polini parts I got to 40 hp at 15000 rpm it was. this was back in the early 90's before every nut started going crazy about polution......

Amazing video man you have been hard at it. Great wrk

Great work. I'm pleased you are getting there. The Denford Triac does a great job. 😊

Just to add more complications to your life: have you ever considered a flow bench and smoke chamber to see what the ports are actually doing?

Remember energy dosend disappear if its not come out via axle it comes out by high exhaust temperature if fuel burn is the same.

A WIN!!! Most definitely! Am really pleased for you!👍👍🏴🏴󠁧󠁢󠁷󠁬󠁳󠁿

looks you got it man congrats 👍, cant wait for the next one hoop you can get more power out of it

Good video, I enjoyed your use of 'Smooth Jazz' during your machining time-lapses.

You should be able use a beam-type torque wrench to measure the running torque of the gearbox/pulley setup to get some idea of the torque it's eating. Turn from the crank with belt and spark plug removed to get a baseline (basically just resistance of piston in cylinder and rotary valve), then see how much it changes with belt installed and pulley tensioned. Even 1Nm difference would be more than 2hp loss at 17k! And I don't know if you're there yet, but maybe it's almost time to start thinking about the engine dyno again now that the engine is running pretty good. I think this fits with the "lowest hanging fruit" approach that you've been taking (which is a very good approach for your situation btw!). I think you're quickly getting to the point where the belt->gearbox->chain reduction complexity is becoming the lowest fruit...

I'm happy to see some forward ground for you. I agree, work on as is with tuning and getting some benchmarks befor adding anymore variables and glory in you success for a time.

This episode a win. Again! Congrates my man. It almost gets boring :D It will never be. Keep it up. Looking forward to the next

Thanks. Cheers

keep up the good work fella

Yaay! a win for sure ..keep at it 🙂

Smooth jazz and cnc noises really is a treat

Greetings from Poland😉

That had to feel good. It shows through in your enthusiasm.

This is one of the best small bore two stroke players on the web with so much info on basic tunning to learned for free.Now your high revving engine sounds bad with your timing modifications.

i miss working on projects with this kind of passion. now im old a feeble so i live thru you :)

Sounds like my pumped up pocket bike I had years ago.

You are an inspiration to diy and me ! From Australia

The well researched rule of thumb for duct exits I published ages ago was that the smallest area should be 75% of the Exhaust Total Effective Area at 1.5X the bore. Then a transition from 75% to 100% at the round header diameter out at 2X the bore - so you still havnt got it right - just trying to help - from Wobbly.

Great episode!

Finally some amazing progress. I’ve been so stumped the last few months. Could changing the rear sprocket help with the dyno runs and their length?

Very good information, Amazing research too. Thank you for the video.

This is the first time in 70 years that somebody has said something about ice engines that I didnt understand. Now I will have to watch it again to absorb the terms. Thank you.

Excellent, nothing like a smile that says (finally we're heading the right direction) 🥳

That's better, sounds so much better dude

You need a slide-trombone style exhaust so you can lengthen and shorten it based on the time of the exhaust port opening and closing. Should be something you can make out of dimensional tubing on your tooling there and adjust it based on the RPM through the crank sensor and a small spring return solenoid or even a linear motor and some kind of tiny computer like an Arduino or Raspberry. Set yourself a 'star-and-idle' point and then have it draw in shorter as the RPMs climb toward max RPM and if it is not adding any load or friction to the engine's output, it SHOULD allow you to super-precision tune your scavenging to reach the very max it can be.

I always enjoy your music too 😊🎶🎹🎷

he's getting good at finishing HIM off with a quick handy

Sounds badass again!

all the horsepower .. nothing better than ripping through the dunes on a 2 stroker properly built and tuned

Jazz and machining ❤

that runs avery nicely

EXCELLENT video!

Crankcase stuffer..increased pressure to intake fuel charge

Do your thing Big Man.. Regards from Sunny South Africa..