Supercharged 50cc Nitro Two Stroke - Downs fuel like 500cc!

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[@2STROKESTUFFING]

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[@Stephane1995]

Man I have to admit that chain made me nervous when you suddenly started reaching at that new carb

[@jimfitzgibbon5492]

Hey my ole friend I have run nitro in my Jr fuel dragster & in my racing karts. First let me ask you some questions. How what % of nitro are you trying to run? What oil are running? & what percent are you running. No one runs 100% nitro in a 2 stroke, so I hope you are not trying to do that. 25% is alot for a two stroke. Even in my dragster I kept it no more than 50% even though some guys ran more, they also blew up a lot of engines. Also you do not have to run over 20 to 1 oil mix. Remember your fuel to air mixture is under 7 to 1 with nitro & alky, so you are already getting plenty of oil at that mix. Just things to consider. Remember also mixing oil heavy fuel makes for heavy viscosity & screws up fuel flow & setting. Hope this helps.

[@andylewis7360]

7:21 A shoe on a tripod?!? WTF???

[@jdmdynosystems6119]

@2STROKE STUFFING use manual mode on the dyno instead of zero ramp rate in power sweep mode

[@DetroitMicroSound]

I would introduce myself to Aalt Toersen. 😉 kzbin.info/www/bejne/qaPFYYhmnN1jZ6s

[@TheMoistpotato]

The values on that last pull are super promising. Cant wait to see how this progresses!

[@Xfacehack]

Been following since first video almost, yea that made me super happy, can't believe he didn't change to a bigger carb (or fuel injection) long before. He clearly knew, even i could tell it was actually running out of fuel. When i heard it run under load now, that was so damn exciting! I don't fully understand the dyno. I guess it depend on the pivot and how much load that sensor see? Then i should be pretty accurate if his measurements where right. 15hp crank is already impressive! Can't wait until he adds boost and timing!

[@TheMoistpotato]

@@Xfacehack Yeah, i think hes close to the point that efi will probably give him the adjustability and tuneability especially thru the wild flow profiles this engine will have. Again, carbs do work, but i suspect this engine will have a extremely wild fuel flow profile which might be very difficult to achieve a nice idle mixture all the way to WOT at redline with these types of carbs.. At least with efi he could have a dynamic flow chart/profile which will allow him to keep fuel flow efficient.. And yes, typically the load is measured around the pivot point which is typically the crankshaft planar point. I dont quite know how he is compensating for the offset pivot (torque moment) in his torque values especially since the engine is basically trying to "claw itself up the drive chain" with a offset pivot, in simplistic terms. It is calculable, but definitely makes the math more difficult. Regardless, what he has achieved is fantastic!

[@chuckingram5966]

@@TheMoistpotato I couldn't agree more.. so awesome so far

[@samuelrydzwullens]

Thing I would add to the dyno if you want to keep using clutches: Tachos on both input and output pf the clutch to be able to determine slip ratio, good to know when and how much your clutch is slipping

[@lorenzhartl8466]

or just dont use a clutch

[@barrymayson2492]

If you are still seeing noise on signal lines try using sheilded cable for signal lines. Thanks for your time.

[@lorenzhartl8466]

I would highly remicommend that!

[@shjskaput4550]

this is great, i love how much your audience can be right there alongside you as these things get done. Truly one of the best channels on youtube.

[@Lord_Verminaard]

Haha, 21:49 watching the fuel in the tank magically disappear.... That carb is a really cool design! The numbers looked really promising on that last run too. Keep it up man!

[@danilolattaro]

Was gonna comment the same! A vortex there

[@priitmolder6475]

Upvote when you did not notice that the first time. But dang, thats some top fuel dragster level of IPG (inches per gallon) over there...

[@reyalPRON]

Hehhe yeah man. That thing sure is thirsty! I bet u that a good tune will help ALOT. It seems so be ultra mega duper rich now. Can a broadband lamba be used to measure the live lean/rich balance?

[@johnsch2957]

PUT A GUARD ON THAT CHAIN!!! Good progress on this engine.

[@kittykatbobo]

At least some sort of bumper Alex. The amount of kinetic energy in the retarder is scary..

[@aptget1974]

I first thought what would happen when the chain snaps. Not to mention this fixed gear setup is likely to eat fingers :p

[@MrJermbob]

Stop being soft. Motorbikes making 100+hp dont throw those exact chains unless they are super un maintained.

[@MrJermbob]

@@aptget1974 Anxiety is so disabling.

[@johnsch2957]

@@MrJermbob I was much more concerned about him getting his fingers caught in the chain and sprockets.

[@danielclarke7109]

Awesome to see the progress mate! May I suggest using elastomeric bushings on each end of the load cell to damp out the high frequency vibrations that the load cell is seeing? That might give you more reliable torque measurements.

[@Henning_S.]

I also suggested that in a comment on his last video...

[@mrsnezbit2219]

@@Henning_S. it was easier been noticed when he had fewer subs haha commenting to help the comment

[@milankostic3717]

Definitely need to smooth vibration off the cell load, none digital electronics can read cell values correctly with that much vibration. It's nice to hear again pure sound off 10+K rpm. 👍

[@MrJermbob]

@@milankostic3717 Yourdyno software has a nice smoothing in the software for this type of action. Dont stress guys.

[@MrJermbob]

You dont want to dampen the information to the Yourdyno unit. The software has the ability to do that. When there is retardation happening and the engine is on throttle it wont be rough at all. Remember he is just using the dyno software all in fully manual simplified mode. This is not power runs yet.

[@MetroTubettaja]

1:22 Patreon advertisement was perfect! :D

[@JohnThomas-vb9se]

My guess, and that all it is, would be timing will make a huge difference. If you’re only at 15 degrees I’d say it’ll take double or triple that. I know nitro 4 stroke hemi engines back in the early days loved as much as 60. In fact that’s how Don Garlits started setting world records with the 426, by adding timing to try and blow the engine up, because he didn’t like them as much as the 392.

[@jeanphilippepoirier6130]

I love your channel! Amazing what a dedicated individual can do. Congrats on making it your full time job! I suggest a spring loaded chain tensioner. If you maximize the wrap around the small sprocket, you can transmit more torque. Also have a spring loaded tensioner would greatly reduce the swing in the long chain in between pushing/pulling phases. And please, put a guard between you and any moving part. If the chain snaps it could really cripple you!

[@johnnykjaersgaard7978]

Maybe a chain cover would be a good Safety option 😊

[@bobcuyt4675]

yep - I had the same worry several times since work on the dyno started.

[@darylnicklen3685]

Always glad to see you making progress. Thanks to the supporter who set the carb allowing for the progress. See you next time for more adjustments. Dazza from Australia

[@RotarySMP]

Time to find the melting point of piston crown, and then fatten it up a little!

[@2STROKESTUFFING]

Yep.

[@joshuaharrison9331]

Well, I just can't say enough how much I love these videos. Crazy 2T stuff, crazy camera shots, crazy Alex. F-ing brillient.

[@ericdeven1296]

Great video. I like how you are growing into your videography, constantly tweaking this and that, same as your engines. Dont get discouraged, keep up the great content. Cant wait to see the dyno graphs of the 2 engines to compare the different power curves from the radically different engine designs.

[@christophercastor6666]

One gremlin down, the rest to go! Thank you as always! -CY Castor

[@joshholbert9120]

Seems like it sounds better with the added timing that carburetor is really cool.Please keep sharing this with us!

[@budyeddi5814]

3:04 That music is so soothing 😌 LOVE THE CONTENT!! Your uploads are always a highlight to my week 💪

[@hunterross9615]

You have made me want a 2 stroke bike for a while now, and over this winter I’ve been building one in my apartment. Thank you for all the info on how they work and the coolest engines on KZbin! Keep on keeping on!

[@RDEnduro]

Happy to be here for another two-stroke journey

[@evilelf5967]

"iv'e got to go inside and unload" haha floored me there alex.brilliant work as ever though.

[@petriranki2662]

i am waiting for the moment when the ignition diagram is adjusted to the final position and the revolution limiter is released. the increase in power is really great at that point.

[@miketee2444]

I saw a device on another channel that was new to me and you've probably heard of but may be helpful at this point. It was a scope that goes in the spark plug hole and allows you to actually run the motor and see the kernel and color of combustion. This seemed so much better than reading plugs and the variables that skew that info

[@malcrandall1309]

In the UK 40 years ago they were known as " Colour Tune "

[@miketee2444]

@@malcrandall1309 thanks. I know or care very little about scooters but I'm a two stroke but and mainly old Merc outboards. Lately been watching the Russian scooter guy Samode or something like that. I can't believe I never even heard of such a device. I would think getting squish and port angles perfect would really show in one of the scopes. Most of the motors I modify are 50s era cross flows so looper ports weren't even considered then. A view into them would help alot. I'm fired up on finding one now. Thanks for info.

[@malcrandall1309]

@@miketee2444 Hello Mike, thanks for your nice reply. I must admit to being a two stroke man as I started road racing at 18 making our own bikes and tuning engines mainly 250 singles, making our own expansion chambers from cut up 45 gallon drums then gas welded. Of course there was no internet then so 99% was guess work, more enthusiasm than money! I have being following Alex for 4 years now since the SPX era which was more home tuning than the highly technical stuff they do now. I admit I prefer normally aspirated and running pump fuel. Regards Malc.

[@TheTT124564]

So stoked you are heading forward!

[@wfomph1435]

hello from bigfoot territory. your ability to stay calm and focused is impressive .and a great inspiration .also a good role model for everyone ,especially young people .thanx keep up the good work

[@mattiasandersson5673]

Haha I fell asleep infront of the TV and woke up when the throttle got stuck, engine screaming at 11000rpm! 😄 soo much better sound with the new carb! Angry! Thank you for showing really interesting stuff on YT /Engine nerd from Sweden.

[@SamZStuff]

Don't shoot I have no money. My support is here 👈

[@TheRealBanana]

Your musical choices are excellent!

[@mandrakejake]

Where I used to work we had a throttle lever with a twin cable system to pull and push the throttle, like an aircraft, very useful for fine throttle adjustable

[@jimdale9187]

Yes, street bikes use the push/pull in USA.

[@malcrandall1309]

Is that on two stroke bikes as well?

[@koekcoek]

maybe before leaning out, for your safety make a longer throttle cable so you can stand on a safe spot or behind something. with some clamping the wire at some spots is should work fine, just like the old engine dynos. Or let it be controlled by a servo motor or something. That engine is getting brutal man keep it going.

[@malcrandall1309]

The slide needs sorting along with a decent return spring. I would like to see the carb operated by a twist grip and brake lever operating the retarder manually. More pull on the lever more current to the retarder coils. The lever could be used as a emergency stop by pulling hard stalling the retarder and engine. This would allow one hand operation.

[@matejburger5941]

Yesterday i've watched this video... This night i had a dream, that number on the dyno was 35 hp... I was crying...

[@malcrandall1309]

Yes I think that 35HP is obtainable, mind you how much RC fuel will it use? I just hope the crank can take all the power.

[@acurarl9929]

I missed the ending of the video. Just rewatched it again. Great wrk. That’s a cool carburetor. I’ve nvr seen them before like that. Think your onto something good now. Excited

[@Bennyboysgarage_]

With the new carb I hardly saw any negatives in HP and she made up to 15ho I say things are looking up for you! I am excited to see what’s next!!

[@MrMasterDin]

So happy to see your channel doing well you deserve it!

[@kasuraga]

God damn that last pull was pushing 15hp without even breaking a sweat yet. Can't wait to see what it does with the kinks worked out.

[@elwin_tjustice45]

I would suggest dropping the D in your PID to zero. Get your P and I working smoothly first. Often times you don't need the D and it can introduce a ton of oscillation in your loop. I usually start with only P, bringing it up until I see significant oscillation, then back it down and begin adding in the Integrator. That should help get your load control smoothed out, then you can tune your engine with a stable load

[@2STROKESTUFFING]

Thanks for the advice!

[@garyyasaki9226]

Love your series here but I get squeamish looking at that open chain running the the background. Any thoughts on a guard of some sort as any mishap would be a terrible injury.

[@hanswurst5493]

i also thought so,dont want another Van Gogh

[@davidbgraham461]

The whole thing is very interesting and the music is marvellous !! Thank you.

[@Arskatehtaalta]

Safety tip. Build a chain guard

[@ericschumacher5189]

This is just a thought; I think your waste-gate that your using for boost control is contributing to the massive amount of fuel consumption and making the carburetor seem smaller than it actual is, given the power made....I would think as long as you keep the pulley size that you have now, that it could be eliminated from the circuit.....I think another issue that the waste-gate may cause, is being that it’s a pressure differential device (not load sensitive) it opens in both relation to throttle input and rpm....which could be leaning out certain speed / load operating regime’s but operate totally different in others....making the carb “numb” to adjustment.

[@miketee2444]

That carburetor is slightly better than just dangling the fuel hose in front of the intake.

[@paulwisdom5383]

I have no interest in 2 strokes, but I've always got time for a mad scientist with a bonkers idea. Been following this for a whole and it's great to see the R&D

[@rickrexrode6835]

My Cr 500 uses fuel like a 250 !!! Not only is the economy increased but the thermal brake efficiency is 20 to 25 % better !!! The powerband is as wide if not wider then its ever been and ive been riding this bike. For 25 plus years ,now so im well aware of the difference, the "Stratified Fuel Charge modification " ive incorporated into the auxiliary fuel ports ,basically injecting fresh air into these ports ,to cut down on short circulating fresh unburnt fuel charge out the EXHAUST !!! When i first started it with this mod. It ran so over of a fuel charge due too the air acting a vapor barrier trapping the charge in to bottom and,primary ports !!! At first i thought it was rich due too the the build being freshly assembled with the extra oil from assembly that would,normally blow out and clear up relatively quickly !!! But it nust would not clear out smoke like crazy so overrich, which from the PDF file i acquired online ,said that this would infact happen and rejecting the CARBURETOR was going to be absolutely nessary !!! And boy they were not kidding ,i just about had to jet it down to really close to the same size jets a 250cc bike !!! So basically i am using almost half as much fuel ,gaining power ,reliability and wider range of disability as well !!! Its been one the smartest things ive done to my ,my super Frankenstein one off Cr500 with 2004 YZF ,grafted go fast and lightening up of the over all bike as well as giving it a more modern nimble lije feel of your more modern 2 and 4 stroke latter model counter parts !!! I used everything from a 2004 YZ250 AND OR YZF 428 450 !!! THE SUB FRAME AIR BOX REAR SWINGER SHOCK LINKAGE ,REAR 19 INCH TITANIUM SPOKED WHEEL SEAT TANK ALL THE PLASTICS ,THE ONLY THINGS FELT ACTUALLY HONDA IS THE AWSOME MOTOR AND THE OLE 92 STEAL FRAME !!! IT DOESN'T LOOK LIKE A HONDA AT ALL , BUT ITS SO MUCH FASTER THEN ANY YAMNAHA AND MOST HONDAS AS WELL !!! ITS TRULLY A OFF MACHINE ,WITH OTHER MODS AS WELL THAT IM KEEPING UNDER MY HAT !!! AS WELL AS FEW MORE MODS IVE BEEN RARELY WANTING TO INCORPORATE AS WELL THAT ARE STRAIGHT FROM THE RESEARCH AND STEADY THE WAS PART OF THE "STRATIFICATION FUEL CHARGE MOD PDF !!! IVE BEEN KEEPING TABS ON MOST OF WHAT PEOPLE ARE RIDING AND RUNNING AS FAR AS 2 STOKES GO ,AND IM NOT SEEING THE STRATIFIER FUEL MOD BEING INCORPORATED??? WHICH SEEMS ,REDUNDANT OF THE INDUSTRY AS IT IS A FAIRLY SIMPLE MODIFICATION ,AND USES ,ALOT OF READILY AVAIBLE PARTS ,AUTOMOTIVE PRIMARILY !!! AND CAN BE DONE TO PRETTY MUCH ANY 2 STROKE !!! THE WHOLE REAL IDEA BEHIND IT WAS FOR EMISSION RELATED PROBLEMS WITH 2 STROKE , UNBURNT FUEL CHARGE SHORT CIRCUITING OUT THE EXHAUST AND THE FACT THAT BILLIONS OF SMALLER 2 CYCLES IN ASIA ,CHINA AND ALL OVER MIDDLE AND FAR EAST ,RELY ON THEM AND ARE NOT GOING AWAY ANY TIME SOON ,AND THE MODS HAD TO BE A RETRO FIT SO THAT, IT DID NOT REQUIRE A SPECIAL NEW MOTOR DESIGN OR HAVING TO BY ANYTHING EXTRA SPECIAL AT ALL AND COULD BE EASILY DONE BY MIST ANYONE WHO HAS A GOOD WORKING KNOWLEDGE OF BASIC 2 CYCLE, BUILDING ,MAINTANCE AND TUNING !!! SOMEWHERE I BELIEVE I STILL HAVE THE PDF ,BUT ITS BEEN 7 or 8 years now and it sorta went away into the cloud and i cant remmeber the research teams name ,but they were from India i believe ,they covered all sorts of thing all of which i basically retained in my brain ,hence not worrying about holding the PDF !!! I READ IT LIKE S BIBLE FOR A FEW YEARS ,UNTIL I MEMORIZED IT AND BUILT ONTO IT WITH MY OWN KNOWLEDGE USE OF PARTS AND DESIGN !!! ITS ACTUALLY PRETTY SAFE AND FLEXIBLE IN LAY OUT, AND SOME BASIC FAILURES HAVE NOT AT ALL BEEN AS BAG AS ONCE THOUGHT THEY COULD BE !!! AND HAVE NOT DAMAGE ANYTHING , INTERNALLY, RHE FEW TIMES I HAD ONE OR MORE LINES PULL APART AND CUASE A HUGE VACUUM FREASH AIR LEAK , USUALLY NOT GOOD FOR STANDARD BIKE FUEL DELIVERY AND ENGINE ROTATING ASSEMBLY !!! INFACT ITS ALMOST LIKE A FAIL SAFE , IT WILL NOT RUN HARDLY AT ALL WHEN YOU HAVE A AIR LEAK , AND LIKE THE FIRST TIME IT HAPPENED ,I HAD TO FORCE OT TO RUN ,BEFORE I REALIZED WHAT THE DEAL WAS AND YEAH ,BY FORCING IT ,I ALL MOST BLEW IT UP AS IT STARTED AUTO FIREING AND THE KILL SWITCH DID NOT DO SHIT , SO PUT THE FRONT WHEEL AGAINST A FENCE PUT IT IN THIRD OR FOURTH GEAR ,AND GENTLY FRIED THE CLUTCH FOR A SECOND TILL IT DIED ,THE LEAN MIX DOES NOT LIJE ENGINE LOADING AT ALL AND DIES RELATIVELY EASY !!! WHEN YOU ARE AWARE AND DON'T, USE THE TRROTTLE AND CLUTCH COAHSING IT TO RUN AND THEN GET HOT REAL FAST AND RUN AWAY SCREAMER , KILL SWITCH DELETE !!! LAST COUPLE OF MALFUCTIONS THAT WERE HOSE CONNECTION RELATED I COULDNT KEEP IT RUNNING ANYWAY AS I SOON FIGURED WHAT WAS UP AND NOW I REALLY MAKE SURE MY HOSES AND FITTINGS ARE WELL FASTENED !!! ITS BEEN A LEARNING CURB THATS WELL RECIEVED FOR ME ANYWAYS AS IT HAS REALLY ,GIVEN ME A LEG UP ON ALL OTHER 2 STROKE RIDERS AND ENGINE BUILDERS !!!

[@bigpowerhouse11]

So much progress has been made throughout this journey!!!! This is awesome!!!

[@mikeznel6048]

This has to wait until I get fire going in the wood burner and can enjoy with a cup of coffee. It’s become the traditional way.

[@MikeyAntonakakis]

Looks like the dyno is much happier now! Even just watching the numbers on the video, they look much cleaner. I think your load cell calibration is definitely good enough for now too - you’re probably within the accuracy range of the torque wrench at this point. Thanks for the shoutout (and you said my name perfectly, don’t worry!).

[@codeack101wlck]

So your pretty much efi now without monitoring a couple things and still have to manually tune rather then a computer getting the values you want, I would suggest getting a wide wideband o2 sensor just so you can have at least an idea of air fuel mix might have to put it in the exhaust ducting im not sure how the oil content of the fuel getting spit out the exhaust will affect the readings though if it were right at the end of your pipe and the blow off has to dump after the wideband keep it up dude

[@koertvanengelen2395]

If it dies full throttle just remove the floatneedle and make a switch in the gasline so you can close it so fuel doesnt leak

[@malcrandall1309]

Looking at the results from the speedway carb tests it seems as though Alex may have found the correct carb for the job. I can't understand how such a large carb can be used on such a tiny engine with a 40mm bore. I can't understand why you need such a large carb when there is so much fuel/air being lost through the dump valve. I suggested going back to petrol some time ago but Alex is firmly set on using RC fuel so much so he has gone and ordered a lorry load. I feel Petrol is more suitable for testing allowing a base line to be drawn then this can be stepped upto RC fuel levels later. Mind you it's all fun to watch! I was hoping that there would be a new video out Wednesday but I think he must be busy making chain guards for the dyno. Sorry for waffling, Malc.

[@scottmcguireTC300i]

Ohh yeah, this is getting real interesting now, so glad you persevered through. The rewards will start coming now. Cheers from Australia

[@gobroracing]

I can tell you are excited!!!!!!!! Awesome progress we are excited too!!!

[@garyeasdale1004]

Sounds a stack better from bottom to top using the speedway carb top job

[@raytheguyinthechair2791]

That new carb is gonna get you some real numbers now.

[@stevenhoman7723]

To clean up oily messes, go to a hardware shop which cuts wood. Saw dust is free and absorbes it quickly.

[@jimdale9187]

Or kitty litter (bituminous clay or oil dry) is much less combustible.

[@mikedrop4421]

When you mentioned the gasket leaking I wanted to say that a great product to have in the shop is silver RTV silicone gasket maker. The silver is high temp rated and you can seal almost anything temporarily and the correct stuff permanently. Obviously 3m, permatex and other companies offer it but the best brands available are the OEM stuff the Japanese car makers use when building cars. They can be expensive but "Hondabond" is not too bad and it's arguably one of the best available. The dealership parts department always has it in stock and you can make gaskets, seal leaks, glue things together and much more. Just my two cents.

[@Nick-qv5jq]

Just a thought - a competition or poll to 'guess the horsepower' for the upcoming test would be fun if poss

[@tonynewcombe9075]

No music please, you & the work shop noises are just fine. Keep up the good work 👍😊.

[@needmoreboost8208]

Now that’s a carby! It would be good to see the colour and quantity of smoke at wot and id recommend keeping the higher oil content until all is happy! once timing and boost is turned up and egt and afr are close then lighten up the oil content

[@prostwest]

Public apology … for "Download Audacity. Open up your voice track in it. See the extensive plateaus at the top and bottom of your waveforms. You are clipping like crazy, and your voice deserves better " … I found a forgotten browser eq plugin and discovered it had defaulted the pre-amp slider to a silly level, causing the clipping locally. I corrected that and you sound fine. Keep up the great work!

[@poptartmcjelly7054]

Your load cell is mounted wrong, which is why it reads high. It should be tangent to the rotation of the engine block and in this case it's not so the pressure gets multiplied by 1/cos(angle). Angle being the angle that it is off by from tangent. Also that race carb reminded be of a certain guy in the local flea market who sometimes brings huge billet aluminum carbs that have a small hole in them (20-30mm) and i've never been able to figure out what they're meant for but i guess people might have been developing carbs and those were the leftovers from that process.

[@skillege]

Love the new video style. Like me I think you are watching to many Wes Anderson movies. That pan 8:45 made me laugh.

[@andersson.l.e]

Nice. Now it starts looking promising. Looking forward to the next video.

[@maritimesoul]

Time for a chain guard my friend, one thread from your jacket and you may only have 1 option for waving hello, please cover that chain!!

[@c-teamtrading9690]

Also consider that short straight exhaust stub will resonate and return a positive wave returning to the exhaust port which can interfere with exhaust flow, hence a tapered lead and a diffuser of about 9 degrees.😉

[@vmcmark7578]

AWESOME WIDEO, I love watching a fellow CRAFTSMAN tinkering around in a PERFECT GARAGE!!! As soon as you put that "NEW" carb on, I thought 💭 💭 Hmmmmmm, didn't those Keihin "FLAT SLIDE" carbs with the lil "WAGON SLIDES" have wheels for making the slide move & eliminate the "SUCTION STUCKTION" problems when trying to operate with a flexible wire cable & even with that they still went to the "PUSH PULL" two cable throttle assemblies so that you didn't need to be "POP-EYE" to override the return spring?!?!?!?

[@Tootall206]

@9:00 Your carb is vibrating. Thats why it starts leaking. It can interfere with the flow through the jets too...

[@malcrandall1309]

I'm hoping Alex will be doing some crank balancing videos as soon as we get back to the PiP project. The vibration was so bad on the SPX variant that the needle wouldn't seat right causing fuel fountains from the carb. I feel better crank balance will lead to better performance.

[@Tootall206]

@@malcrandall1309 I doubt that balancing will be enough. Make a bracket to support the other side or the carb.

[@malcrandall1309]

@@Tootall206 Hello, Just out of boredom I re watched the video again and watched closely around the 9 minute mark for the carb vibrating but I couldn't see it! What I did see was the dump valve shaking at the front of the engine, this has being commented on previously that it needs a bracket. Is this is this the item your referring to.

[@Tootall206]

@@malcrandall1309 I've checked it again. You're right. It's the dump valve.

[@86Ivar]

The shaking chain might be the source of noise on the load cell, if thats a problem.

[@iannsr125]

Awesome and it's good to see ot working out now , only thing is if your increasing the boost would it also be worth changing the size of the rotary valve so your not loosing too much fuel and air so it's open for a shorter time . Just a thought

[@pepperoni-prepper]

looks like its time to get an exhaust gas sensor and start tuning the fuel mix/rpm and refining the rpm advance curve. at first i thought you would need fuel mix compensation for the air density change due to the supercharger, but i think that is only the vortex styles that need it.

[@malcrandall1309]

Hello, I see lots of people commenting similar to you. I have asked before how you would go about making a fuel map for such a dirty engine with oil pouring onto the floor. Does it make a difference with it being a two stroke? I have asked this question before but received no answer, can you help as I come from the clockwork era. Could anyone else answer this question for me. Cheers Malc.

[@leostgeorge2080]

Nice running much better. Tach's much faster and 6.5-7 hp from 50cc is very nice. Hope you will be installing this engine in a machine. Would love to see the end product able to perform.....on to your next video

[@kramler]

I hear you say flat line, but my brain says f*ck line, every time

[@jaratt85]

On anything that has to deal with exhaust heat try using thin copper or even aluminum (like from a can) or thin stainless (like office air conditioning ducting) so it'll be less likely to burn out than regular paper gasket.

[@rasmus1600]

21:47, damn that engine is thirsty, look at the gas tank.

[@michaelzilio4268]

You made my day, watching the video right now!!

[@SharkyMoto]

i think you should use a torque wrench without adapters and extensions because it messes with the torque reading of the wrench. heard it somewhere, i think it was AvE's channel so it could very well be true, you should look into that if you want to use it as a calibration method :)

[@qylka]

fan va jag älskar din yt kanal :D mannen fortsätt vara KUNG!!!!

[@lucaslittmarck2122]

If i could i would give 5 thumbs up for superduper videos like this one.

[@victoryfirst2878]

I like your little lathe. Look forward to see your engine set some records. Peace

[@skaggtrollgaming6540]

A torque wrench always have a little bit higher reading than it’s supposed to be set to because they get a little bit old and worn

[@charlieguenther5490]

Iv never seen such a flat power band. If your power output is on par that thing is a monster. The torque just goes way up as the speed goes down. Would like to see a graph of it!

[@2STROKESTUFFING]

Should get some proper readings soon. I'm seeing the same thing as you though, very flat, very wide.

[@freddy7700]

I think, the music you put on your vids are great...

[@2STROKESTUFFING]

Thanks! It's all from soundstripe

[@freddy7700]

​@@2STROKESTUFFING ok, I think you got a very good taste for good music

[@2STROKESTUFFING]

@@freddy7700 Thanks!

[@DanneZzZ]

At the last run you can see the fueltank get drained haha great work

[@janvanderwal2744]

Nice carb, runs better and better, for better spark use no resistor cap and no resistor plug, this makes a big difference!

[@michaelcarberry594]

Thanks for sharing this. Great to watch a unique scratch build come to life.

[@erniemathews5085]

Hooray, a working carburetor. I wait for power.

[@paddy2661]

You have just jumped 6 months in progress, kept hearing it die full revs needed a bigger carb. Just remember when you add boost you need the fuel aswell (plug chop) check color of plug. Watch timing carefully when advancing melt piston. I'd ad boost now if rich mixture at the moment. Cheers loven it small steps

[@mealex303]

chain tensioner would help to

[@marvinrascal3376]

Bloody fantastic video. Really cool to see some successes.

[@robinottosson8412]

Kompressorn tar sin effekt. Redan nu lär det vara över 20 hk motoreffekt. Den kommer leverera. Mycket intressant projekt hoppas på skrämmande effektsiffror.

[@canadianoddy8504]

I see a fire extinguisher in the video now :) ------- never noticed that in the other vids. Maybe I missed it.

[@grill1234]

The most exciting episode so far!!!

[@zeb06tem]

Very good video for a sunny sunday 👍🏻 Good work as always 😉

[@_coffeeandcigars]

nice! ...but it hurts a bit seeing you work so close to the floor. I would raise everything a bit to be more comfortable tinkering =D

[@crazylife6319]

next time, run to autozone and pic up some metal sheet gasket material, that should hold exhaust gases fair

[@Swinginspanners]

So stoked for you now 😍 🙌 Keen to see how it reacts to a bit more boost 😀

[@seantheberge5456]

That flat slide carb looks to me like a form of mechanical fuel injection. Really nice carburator in my opinioon. Thanks for the inspiration....

[@doingthis6907]

this looks so cool have you thought about running an wideband AFR on the engine for tuning?

[@drgibs347]

This happens with positive displacement blowers(superchargers) a 300cc blower is the equivalent of increasing the engines displacement by 300cc. :-) btw i can't wait to see this beast in a moped or bicycle!! Its going to absolutely rip!! Keep up the good work as always.

[@Henning_S.]

Depends on the gear ratio between crankshaft and blower... In his current setup, the pressure regulator dumps all the excess air fuel mixture into the exhaust, so it is impossible to calculate how much usable displacement it has in reality. It will massively reduce the fuel consumption, if the dumped air fuel mixture is injected between carb and blower, so it can be reused...

[@Surestick88]

@@Henning_S. If you recirculate the fuel air mix back into the carb it will go rich as the carb will be adding more fuel to an already appropriate mix.

[@Henning_S.]

@@Surestick88of course, that is why I wrote "between carb and blower" if you inject it behind the carb, it doesn't get richer, it reduces the amount of air flowing through the carb and therefore saves a lot of fuel....

[@deirdretobin3672]

What about biting the bullet and going with fuel injection? Seems a two stage approach would be ideal, with some cooling advantage too... It seems you have all of the electronics in place.

[@Josh-ic4py]

Love the videos man ! Might sound crazy but with your float carb, you could open the needle valve hole to allow the carb to fill faster as well. Most carb have available needle and seats in multiple sizes