Supercharged 50cc Two Stroke Flamethrower!

[@IanB22]

This was HUGE progress this week! Correct fueling is what we've been struggling with for MONTHs.... WIN!

[@jopgielingh9583]

I’ve been a weekly viewer for a little over a year now, and the progress we have been seeing recently has been INSANE. Could not agree more with this comment. Let’s go 2stroke stuffing !!!

[@yzrippin]

We've? Never seen you in his vids

[@JGollez]

@@yzrippinThey support throo Patreon...

[@PunxTV123]

@@JGollez does he help solve his problem?

[@JGollez]

@@PunxTV123 I hope so...

[@rubikmonat6589]

The transition into the sponsor was brilliant.

[@nolimitfano2]

Took time out shortly after to say the same lol

[@Headerflame]

Yep! It’s beneath me now! I near shot soda through my nose…🤘🏻

[@onecrak]

Yeah shame that company is Chinese owed and is just about making money hiding behind a save the environment guise....... Just saying 🤔

[@chrishartley1210]

He's getting ready for his audition for the rerelease of My Name is Earl.

[@fetus2280]

ya, too bad its a total Scam though . Look it up and see .

[@lewis4757]

Never stop making your videos dude, love the content keep it coming !!!

[@JonasBerntsson]

It never stops giving me a big smile when I see a new video has been posted by you! I just love your videos. Nevermind comments on ads/commercials, I can't even image the cost of just the nitromethane you burn each video. Keep up the great work! Hälsningar från grannlandet till söder om Norge 👍

[@antonhoward9027]

I love watching this stuff. I'm a Toolmaker & Development engineer with 40 years of experience and a historic motorsport background. Simply superb stuff, you inspire me.

[@tommylee9339]

I've watched this entire struggle and to see it scream finally is amazing! Great editing, clever rigs with clever music, it's a win!

[@wags9777]

The dedication and commitment is unparalleled. To fly anywhere to get a part for a project is proof positive.

[@Mybeardog]

I sub to well over a hundred channels. This is without a doubt my favorite. Great stuff brother 👍

[@AimlessMoto]

I bet the pressure from the blower is pushing the slide into the rails... you could try simply coating the rails and edges of the slide with teflon, or other dry lubricant and seeing if that fixes it first before cramming more spring on top of it. Great work so far!

[@georgedreisch2662]

I agree. Blasting the slide with glass media, to provide good adhesion, then spraying and baking it with a good dry film lubricant leaves me thinking it should help.

[@dirtyfingerprints9470]

Look at the pressure difference! How much boost is there at the moment? The boost works against the slide and hinders it from coming down. ...Or im totally wrong...

[@2STROKESTUFFING]

That's the problem. Not only the pressure delta before/after slide, but also over/under. That line I added to the top was to make over/under better.

[@AimlessMoto]

@@2STROKESTUFFING Right, but it's not about equalizing the pressure so much as taking away the lateral force on the slide. In this instance a round-slide would probably work to cut through the charged air better, but it would defeat the purpose of what you're trying to accomplish. Polishing the slide ends may net you the results you want just by getting rid of friction rather than increasing force on the spring.

[@davidgierke7582]

Adapting a variation of the drum-valve instead of the slide-valve would do away with the problem altogether.

[@giuseppe4909]

Here we go !

[@mothereartha7]

That sounds so crisp, that’s the most two stroke sound I’ve ever heard, that’s fully two stroke, love to see this mated two a custom 8 speed gearbox,

[@kenkennedy5516]

I’ve had similar sticking slide problems, back in two stroke days, solution was to coat the slide in Teflon ….no more problems and the slide can be re-coated as required can be diy workshop job cure in oven. Happy daze 🚀👍

[@wtechboy18]

something to think about is that the compressor is trying to shove a huge amount of air through that slide valve. It's got an enormous amount of sideways pressure on it basically. You probably should skip trying to put heavier springs on it, and just have a push/pull throttle cable pair.

[@2STROKESTUFFING]

Hoping to source a push-pull cable monday.

[@johnmitchell8188]

Best thing ever, now I want a moped. I am really enjoying the journey of this project, just pure education and entertaining at the same time.

[@olsonspeed]

2-stroke alchemy, definitely a Black Art known only to the worthy true wizard of speed.

[@MatteoBaldi]

Lots of progress indeed, can't wait for the next videos, keep it up!

[@daveduncan8123]

Lord Alex you should have been in the movie "A Brilliant Mind" the way that you "keep on going on" An obvious canditate for a World Wide recgnition. Love your work. Will watch you till the end. From one Scot to another.

[@stevenhoman2253]

For what ever reason, you are the most convincing salesman for the certificate yet.

[@blsully]

So exciting! I hope you realize there are legions of us who are living vicariously through your ups and downs in engineering the baddest 50cc 2 stroke ever. It's super cool. Like, favorite-content-on-KZbin-ever cool. Productivity, dry humor, 2 stroke crackle, forced induction?! How could it possibly be better than this?

[@retired-pipefitter]

I bought my wife now a Lady some land in Scotland! Hope it helps

[@wattsy7929]

saw the loud warning: donned my headphones and maxxed that volume >< sweet sweet 2stroke ahh thank you, you mad wizard :)

[@kevinsellsit5584]

Fear not, you have our undivided attention! Anyone watching for years who re-plays the pulls to appreciate all facets of the challenge involved, would have to appreciate the sustained expansion of the pressure pipe and the ability to hold and or accelerate with the massive initial load of the dyno. If it were easy everyone would be doing it, and I'm not about to get out of my LazyBoy and take a flight anywhere for a few metering rods you could easily grind out with just a few hundred thousand dollars' worth of equipment and a degree in fluid dynamics. Did I say that last part out loud?

[@robwatkins4356]

Slide valve changed to a barrel shaped with bearings and Teflon seals return spring mounted outside the housing. This may reduce the sticking due to air flow pressure against the flat slide. Or it cold just be a dumb ideal. Love the channel.

[@2STROKESTUFFING]

Playing around with ideas for a solution, something similar has crossed my mind👍

[@robwatkins4356]

@@2STROKESTUFFING That is the way we control rc boat engine in the old days. Drum valve on the exhaust. Crude but functional. Keep it up, we'll see your name in the record books one day.

[@TheAustereman]

When music started at 14:30 omg, marvelous job with all the editing

[@billyking722]

Sounds like it’s running a lot better well done lots of hard work to get this far keep it up I am a dedicated two stroke fan in the uk all the best

[@kellyswoodyard]

This will help with clamps not supplying enough pressure to seal the hoses properly. In Australia, all surveyed vessels going to sea, must use 2 hose clamps on each join. I never had a leak from the joins, had a hose or two wear out, bot the joins held perfectly.

[@mrgonk3060]

My hunch is that you are actually forcing air past the slide, which is then picking up fuel and causing that hanging throttle. After all, carb slides don't stick on overrun on a NA engine where there is a massive pressure differential.

[@johannesdesloper8434]

Fun, you need a butterfly air control valve. That will equalize the forces on the valve and prevent sticking. Pressure differential on the air valve puts a force on it.

[@shannonvandijk958]

Loving the content! In terms of the sticky slide, would it be worthwhile using a servo to control the slide. It will give the push/pull capabilities. When the engine gets put in a bike, it could make it possible for one electronic throttle to control both the throttle and sliding reed valve (if that also will be controlled by a servo) according to what the engine requires at certain rpms.

[@bingusmctingus4395]

Servo has digital delay so it’s not as responsive as carburetor

[@thomas-nk7kx]

is a few miliseconds that much of a hassle?

[@theshippingcontainergarage]

@@thomas-nk7kx Yet another electronic to battle EMI...

[@Frank-Thoresen]

I asked the same question in the last video but decided to delete it because I wasn't sure I was experienced enough to enter the topic. Thank you for adding this question here.

[@2STROKESTUFFING]

Would be a neat solution👍

[@Ratkill]

The fact that you can maintain a normal job and relationship and make progress during your occasional scheduled time is absolutely insane to me. I've done some moderately ambitious projects here and there, and if its not consuming my entire life I can't get anywhere, with weeks of stagnation in between. The underlying life habits required to pull this off are peak discipline.

[@2STROKESTUFFING]

I maintain that relationship, but the job I had to quit - doing this full time😁 Can relate to things consuming my entire life.

[@malcrandall1309]

@@2STROKESTUFFING And we thank you!

[@1crazypj]

The 'problem' with 'sticking slide' has been known about for at least 70 years to my knowledge. It's not the spring but a combination of pressure and surface area. Get a carb from an RMZ400 or similar MX bike, they have wheels on the slide to prevent it sticking open. Having a flat slide makes things worse if you don't have opening and closing cables. On a four stroke motor, the high vacuum causes slide to jamb, your problem is boost pressure causing the same , pushing slide against housing.

[@2STROKESTUFFING]

Yeah, I was pretty sure it was going to be a problem. Have acquired a push-pull cable. Nice tip about the roller slide carbs!

[@TheOneAndOnlyRandy]

watching the Harmonics on the 2 different sides of the belt while throttling the engine is almost mesmerizing. And awesome sleuth work on that fuel leak I spotted in the video last week, now just have to figure out the new leak. that little port you blocked was losing more than fuel I am sure... some of your boost pressure was probably leaking from there as well

[@jordanwright6854]

Love watching a smaller channel that is definitely going to become a great channel.

[@LesNewell]

Unlike a roots blower, a centrifugal blower outputs a roughly constant pressure at any given rpm. Even if you block it off the pressure does not rise much. That's why the blow off valve is not tripping when you close the throttle.

[@david929190]

I've seen a slide plate style throttle for ITB's on mechanically injected V8 that used small ball bearings in channels between the engine side of the slide plate and it's housing to allow free movement.

[@FrankZapperlooter]

looking forward for your next video - the progress you made is awesome !!!

[@stevenhoman2253]

Yo, Zappa Looter, I'm An FZ fan, big time, even did an interview with my mate and Frank. A really nice guy.

[@chrislivengood7350]

I'm just glad I am not the only one with the turbo heater in the shop. But it is going to be a very unusual 17C here today, so no heat needed.

[@reedymc]

A 16k+ 2 stroke 50cc... yes please! Would love to see a 125cc version 😋 Awesome work dude!

[@paddy2661]

Stretch the spring will gain some tension, maybe a tip don't shut reed valve as quick when lowering revs . Love it well done Alex

[@larswiss3677]

This is the most exciting KZbin content, i love how dedicated you are and you come up with the most crazy ideas, and just work them out! Keep up the good work!

[@randommumble.wavfiles6952]

it has been said through the great grape vine of 2 stroke owners that a heavier flywheel can help stabilize engine rpm making it not so erratic and keeping the powerband more consistent and tuning easier

[@axelspie615]

Hi at 10:00 mins in your video you can see some highvoltage arcs at sparkcoil right from shuko connector

[@2STROKESTUFFING]

Think it's a metal chip reflecting light, I'll keep an eye on the coil next time.

[@johnpezaris6982]

Amazing that it idles so nicely. Does the set screw you used to plug the nitrous hole tighten against something, or could it possibly vibrate all the way in and get ingested by the engine? I've had something similar happen and the engine was a total writeoff. Maybe countersink the hole for a flathead screw instead, to eliminate that possibility?

[@ACatKrom]

IMHO easiest fix for the throttle is to switch to a marine push pull cable. make a "knob" that fits the where the standard cable goes into the slide, and threads on to the end of the boat cable, add a bracket at each end to hold the cable housing (just buy one for cheap, and mod it to work) and get back to running it

[@guyredshaw1422]

Brilliant! Big steps and the motor is sounding sweet. Love the introduction of 'Bob the blackboard' (or whatever its name is).

[@mistermacgray]

A slider carb setup you should look into a pull/push throttle cable setup so when you want it to shut it forces it to shut. I did see you touch 16k rpm, very nice but didn't look like it was making much boost. Very nice build so far.

[@kasuraga]

I love starting my morning watching some 2 stroke madness.

[@sylvainbergeron4803]

Made a "rocker-arm" to close and open your "flat-slide" whit the springs outside ...ajust the direct speed of open/close the flat-slide whit the distance of the 3 points in rocker-arm.

[@BeamBinge]

Nothing like two stroke stuffing and beer to start my weekend!

[@jasonbirch1182]

You can cut the spring and stretch it to make it stiffer. Adding springs can actually make it softer in some cases depending on preload.

[@AxlMetcalf]

That scalloped alc needle is a pretty neat thing

[@martux6815]

i think that putting a like 28mm lectron is the better route, with this you can remove the second valve and have a better starting and running

[@MrSagerific95]

Watching you make progress gives me hope and conviction to get off my ass and make progress on my own engine builds. Badass, thank you Lord Stuffing.

[@budyeddi5814]

17:12 *BIG FLAMES* 🔥🔥🔥 Love the content!!

[@turtlemann14]

if your getting flutter and the bov isn't working, then you need to turn down the base pressure in the bov / make sure it's sliding well. the rotax isn't flowing enough for the amount of pressure it's making.

[@JAGFG42]

Loved the slide into sponsor, but like you should really transition to rocket engines,(lox and liquid methane) I love how in-depth you get with your trouble shooting every issue, that level of engineering it till it’s at max efficiency is so addicting. Watching you go all in like that in a rocket engine context would be sick.

[@RRL551Dynamic]

A return cable guarantees its closing, great vid, good luck with getting the nitro licence.

[@andrewwasson6153]

It’ll need a solid rod to raise and lower the slide + a spring loaded push pull throttle shaft with a fitting to actuate the slide. I think it’ll be a fairly simple addition for Alex. The real trick is to figure out where there’s enough room to fit it.

[@mainrig4981]

the air preasure pushes the needle body against the carb slides ..... 2 tiny bearings at the bottom sides of needle body maybe

[@jasonaldenhaley1]

NOICE to see you making progress in the + direction. That "1 step forward, 2 steps back" starts to flippin suck ars after a while!!!

[@brendanhayward1803]

Been waiting all week to hear it run and it was well worth it..the progress is real !

[@chadhalverson1833]

Bowden cable to push reed valve slide closed, instead of relying on interior spring? Rig a spring on the other end of the cable so you can get a good spring rate and travel. Also, maybe the slide sticks from friction on the face of the slide. The slide friction increases as RPM increases from increased air flow/pressure?

[@waynedavis42o]

I wonder if the slide is getting stuck because of the boost pressure 🤔 always love watching your videos educational, interesting and original makes me want to boost every 2stroke near me 🤣 that blow off👌

[@Frank-Thoresen]

I also thought that the plate could be under too much air pressure to slide easily above 10K rpm. In another comment here it was asked if the slide could be controlled electronically (servo)

[@mike25620]

Does he even need the slide anymore? Wasn't the issue fueling related all along?

[@pauljs75]

It may be fitting in there with small enough tolerances where temperature affects it. So who knows how much that could be with the cooling effect of the fuel being vaporized vs. the heat of the engine.

[@bodox3859]

Go pneumatic instead of spring loaded?

[@mikemoore9757]

Machine a slide from Teflon to reduce friction. You're almost there!

[@freddy7700]

Great performance so far. I've seen 16.000 RpM... Now the 2-stroke saw is singing. I enjoy your progress. You have deserved it buddy.

[@teltwosheds2972]

You need a twin cable set up for your slide. Actuating a cam via a rod to the slide.8

[@nextstageautomotivelights2512]

Salute from the Philippines! Great Project! Keep it up!

[@nhytg376tgyuu765gjmg]

Mabuhai!

[@stovan]

You can use a lever activated solid rod inside the carb. Then you are also able to use twin cables for dual action. And you can use whatever for cable retension.

[@decossebrissaceloi6849]

Concerning the fact that better the engine is working more the valve sticks, it seems logical because the pressure build up when the engine revs pushes against the slide which increases the friction so it seems to stick more Love your content Cheers from France 👍

[@WashingtonForestAdventures]

Loved the White flames in the exhaust

[@cannonEDHA]

Yes yes yes it feels like real progress now Alex all the trial and error is finally paying off , cant wait for the next upload

[@paulversteeg8581]

Great sales job, you convinced me to order one for me and one for my wife. They make for great and unique birthday gifts. We'll be lady and lord landowners soon, can't wait. Thank you for revving this up.

[@808bigisland]

Now you need a harmonic balancer on the crank or a balance shaft. The 2nd and 4th order shake seems quite high above 10000rpm. ...and this engine deserves a perfect streamliner body for the saltflats. Do a supernarrow fourwheeler that can convert to a twowheeler. Two records on one chassis.

[@retired-pipefitter]

Nitro is currently $50 a Gallon here in the US.

[@ZebbePlayz]

That 2stroke is amazing! I really want to see more videos of it.

[@johnnym1320]

I'm thinking the blow off valve is not working because there is not a constant vacuum signal in the crankcase, maybe try moving the signal line from the blow off valve between the carb and sliding reed valve, what you call flutter is termed compressor surge. blow off valve needs to open when you get off the throttle to stop compressor surge maybe you know this, but you have not mentioned it. project is coming along nice.

[@Gixie-R]

Perfect Alarm clock/Ring tone.

[@robbiehoughton4382]

sounded great and idled like it should, well done!

[@markcdeyoung3118]

Definitely sounding like progress ! I have similar problems with the carburetors on my Honda XL600 all that suction generated from that big piston sucks the plunger against the side of bore and makes the throttle crack open a little unpredictably .. and it also drop slower in the bore as well

[@carloswheeldon2553]

Ive had a similar issue trying to run nitro in a two stroke engine! Turned out the air travelling in the engine was freezing the slide open. My engine was N/A i would imagine with yours being supercharged the port velocity is very high coupled with the cold Nitro fuel it could be a similar situation? Just wanted to throw that out there for your digestion! Keep up the great work , your almost there. 👍🏁🏁🏁🏁🏁

[@davidgierke7582]

Cold nitro fuel?

[@carloswheeldon2553]

@@davidgierke7582 maybe! Its always easier to start a nitro powered engine on propane, then switch it over, difficult with a 2 stroke unless you have a oil injector👍

[@MichianaFisherman]

I was nervous about you waving your finger around those spinning pulleys.

[@ianturpin9180]

Could a Morse cable for the throttle help. This would give you positive control in both directions.

[@robertanderson3282]

how incredible that metering rod is, all those niggling issues seem to be getting sorted out

[@AntiVaganza]

I don't know the first thing about engines - but long time follower. Anyways, to check if the blow off valve is opening without having to put your hand there I guess you can hang a small yarn or ribbon in it?

[@jamesmoffat9754]

I love the smell of 2 stroke exhaust in the morning!

[@codeack101wlck]

Hobbs switch time, to manually control boost on the blow off valve

[@ro63rto]

Oh to fit this to the old Piaggio Ciao I used to ride at 14 in Italy.

[@mrolsen6987]

That electric starter was a slick move 👍

[@julienboucaron9780]

Nice progress ! It starts to really work as intended 👍. May be you are missing some additional physical guiding of the cable on both your levers, just like a large throttle tube as found in quick turn accelerators on sport bikes: to help with the cable guide, you can use a piece of the Bowden tube in Teflon from the 3d printer

[@motojackrack3353]

Lectron slides stick it has been an issue for years. There to tight sanding a little material off the slide solves the problem. The worst problem is the needle not being connected to the float and sticking closed then running out of fuel. Other then that it is a great carb with a power jet or you can just put a power jet on a stock carb.

[@2STROKESTUFFING]

👍 I'll give the slide a little more clearance. Yes, float retained in the valve is a weird design desition, wonder why they did it that way.

[@motojackrack3353]

@@2STROKESTUFFING Right I have no idea why they continue to do that. I was litterally taking a hammer to the bowl to get the needle to come down on my CR250. Ended up taking the carb off and putting power jet on it. Works Awesome! Talked to the owner at lectron about. He said it has never been an issue.....lol I got and idea you need to make a needle with and little wire attachment deal! Could be part of an future episode!!!

[@Logan880121]

You have a lathe a grinder and a caliper, everything to make metering rods custom best suited for your engine, maybe consider this before flying somewhere to buy them. Try some silicone grease on your slide lubrication makes wonders. Thanks for entertaining us.

[@motorizedbikefun6920]

Your correct without a blow off valve you can cause damage. Mainly bending a turbine blade.

[@anno7465]

One idea is to mount 2 tanks. One for methanol and another for gas and connect them via valves close to the carburator. It will make purging and making fuel changes much quicker with less effort.

[@2STROKESTUFFING]

👍 Need to purge the pump, reguator, etc. too, otherwise I would've done that.

[@anno7465]

@@2STROKESTUFFING since you purge them often and will probably many many more times it might be an idea to mount two tanks any way a little less filling the tanks at least.

[@Erteywie]

Maybe there's a way to divert some boost behind the sticky slide. I'm thinking it's just being pushed by boost (and pulled by vacuum) into the side of the housing and that's why it's having issues returning. Or rollers to help it slide more easily.

[@diesdasa]

I guess the boost pressure is pushing the slide up? Guess you need some stronger spring or additional cable for forced closing of the slide.

[@stevenlane9272]

I guess the boost is pushing the slide up against the groove in the carb body causing the sticking.

[@ajithkrishnan7790]

Was there a video explaining how you are interpreting the numbers on the screen as you are revving the motor? If not, could you make one?

[@2STROKESTUFFING]

Except for boost, temp, and rpm they're basically showing nonsense in this vid - the retarder is not turned on.

[@mtreis86]

I'd guess the slide is being pushed, by pressure from the supercharger, into the back of the channel it is in, adding friction. I wonder how you can test that. If that is the case, maybe polish the contact surface between the slide and the carb, where the pressure pushes the slide? Or get some teflon in there or something. Is there a push-pull kit you can install for that carb?

[@isickofit]

I wondered about linear needle roller bearings and a pull shut spring?

[@darrellkelso9915]

You may have to use a butterfly carburetor. A slide will always be an issue.

[@2STROKESTUFFING]

Playing around with ideas to combine a metering rod with a butterfly valve.

[@jamest.5001]

Yeah, I have had problems with FedEx lately, as well as USPS, maybe other delivery services, I had multiple packages that was "delivered" but non was, then I finally got the package 28days after delivered, over a month after I ordered it, most packages are within 4-5 days at absolute most, but this was from only 1000 miles away +/-, and was said to been here in 3 days, they usually are a day early, lately they are a month late! Things are getting crazy!! ( The screwed up thing is, they were from different places!!)

[@francescoporpiglia650]

Now the beast is starting to awaken! For the slide stuck issue why dont you try to use a rigid cable made of steel? Then you can put the flexible one outside of your carb and you can even add external springs for stronger return. Actually the boost from your turbo is smashing the slide against its seat so it's hard to make it move freely without any rigid solution