Double Engine Aprilia RS50?!

[@2STROKESTUFFING]

Thanks for watching! Patreon live stream Sunday - discuss the latest video, two strokes in general, rum, old school piracy, etc. Your support on Patreon really helps! www.patreon.com/2strokestuffing

[@ianturpin9180]

Once again I will tell you that original armor all will cure your foaming problem. To test put some fuel in a drinks bottle with one drop of armor all and shake. No bubbles . The armor all effects the surface tension of the bubbles no surface tension they cannot form.

[@2STROKESTUFFING]

@@ianturpin9180 Thanks for the tip, again... I've been meaning to get some and try, but I tend to forget things 😂 try to remember now!

[@DetroitMicroSound]

Aalt Toersen. Rent a van, and drive down. Bring a powerplant you're working on, and a camera operator. 😉

[@benoitmyrand6490]

Why don't you try trotte body fuel injection ?

[@whynot5425]

Just wanted to say I love your channel and content, I just wanted to ask for content and knowledge wouldn’t it be better to start with a known motor with easy accessible parts and boost the hell out of it? Maybe a side project to run along side of your original content? 😊

[@jameskirby9981]

Probably the most consistently high quality videos we've all the pleasure of watching

[@retired-pipefitter]

Best video in months, more building less worrying about cinematography.

[@2STROKESTUFFING]

Thanks! There was lots of worrying about cinematography in this one too, but I kept it to myself😁

[@tonyd7164]

I think this is A better solution than the last chassis for dyno testing. I look forward to you finding room for the super charger in this set up.😀

[@morganfreeman5171]

Problem isn't the chassis but the dyno itself (has to much inertia for a small engine with a very narrow powerband)

[@2STROKESTUFFING]

Actually it's pretty much perfect... The problem is my stupid transmission solutions.

[@paddy2661]

​@@2STROKESTUFFING Alex try extending the primary part of the pipe , the further the expansion chamber is the more topend powerband. The humming topend revs is shortage of fuel with added load. I honestly thought the vacuum carb was going to resolve all the issues maybe the stuffers are to restrictive limiting topend , maybe try once you have new gearbox running half size the stuffers in crankcase. Huge effort well done it'll work.

[@dukie1616]

The fact that I never know exactly what kind of new engineering challenges I’m going to see or the direction he’s taking or the hurtles he will conquering at any given week, keeps me enthralled. I’ve been on this 2Stroke Stuffing ride for a while and have no intentions on getting off anytime soon. Great video👏

[@karyjas1]

You are apologizing for taking a while to get things done, but that is exactly how i like it, i want to see some ups and some downs, im curious about the thought process and see it happen. There is barely any content like this on KZbin, and i am very thankful that you do what you do, makes my evening when i get to watch one of your videos

[@CC-pj7iy]

He was responding to a growing amount of comments about frequent breaks and less work focus in videos for the last 4-5 months. This was an excellent return to form.

[@TurboDog73TX]

Your sheer refusal to give up, coupled with a passion for making the best product You can, keep Me back every week. You are making mechanical art, and are kind enough to share it with the world. Thanks man.

[@lemmehaveone]

There's something very exciting about seeing this engine connected to a proper gearbox (and sitting in a real motorcycle frame)! Keep going!!

[@stuartroyle1402]

finaly i just got you figured,,,,there will be no end result or solution showing monster power numbers @20,000rpm ,,,you just enjoy going down endless rabbit holes to se whats down there and finding out how you got there!!,,,love it....look forward to seeing where you are with the project in 2030. keep on stuffing.

[@relaxedkittens]

Hse department here. Hope to see you work on that chain guard we wish for. If your pant will catch the chain/belt there might be a twostrokepirate channel

[@wadesta1986]

This is amazing! To be able to look at half an engine and a random frame and say to yourself "yeah, that should fit" is just awesome! Love your work. Best part of my Saturday mornings (In Aus).

[@notsdandard3449]

Brilliant video as usual Alex. Been watching for about 5 years now and your uploads have allways been the highlight of the weekend. Amazing content, superb music and cinematography, plus the problem solving is the icing on the cake! The variety in your videos allways baffles me! I've seen twin exhausts, rotating exhaust valves via chain drive, primary and secondary intake setups, two different supercharger types on a 50cc two stroke and the list goes on! Your content and ideas are allways brilliant and it's those out of the box ideas that allways bring intrigue with your content. Don't ever be apologetic about these things taking time, as a fabricator/machinist myself, I know how much time and effort goes on in the background of these videos. Keep up the brilliant work! I was allways on your side with the carb vs injection war, but lately with you having so much carb issues it would be cool to see you finally dip your toes into making some form of modular fuel injection/throttle body setup to finally get away with all of the carb issues and different carbs. Now that you have a good rolling Dyno setup it would be cool to see you starting to play with the injection side of things as I'm sure the adaptability between all of your different ideas might end up being a bit easier when you can map the fuel and timing to any wild idea and application. Obviously it will have its caveats and difficulties but I've never seen you back down from a challenge yet! For reference here in NZ I have seen a few turbocharged 125-140+cc Honda engines in the little monkies running a tiny injection setup that seemed to have worked well and at first glance they were the same size as the original carburators and were apparently not too bad to setup even with the forced induction! Maybe even just buy a setup that could work and shove it into the shelf for the day you decide to play with it. Ive allways been biased to carbs but I'd definitely love to see your intrigue head to the direction of fuel mapping. Especially with some crazy ideas with throttle bodies. Maybe even pre and post crankcase to play with the volume/flow? KZbinr of the year 5 years+ and running in my opinion! Keep it up!

[@Nrgpack]

Good going Alex, great editing and story telling. Now, I'm inspired and will jump down to my workshop and make miracles happen!! Big thanks for your efforts!!

[@oldschoolman1444]

What I've found when building something and it doesn't quite work out as hoped, its not a fail but a learning experience. You rock man! Keep up the good work and keep pushing the boundaries.

[@caseymoir]

You eat problems for breakfast, lunch, and dinner. Love to see you repurpose so many parts you have laying around. Very resourceful!

[@RogueBro]

Over the years this channel has become increasingly interesting and packed with knowledge

[@GenerationAI2024]

I really love that something is happening in your videos, yes its maybe part 50 now but you are gettting things done. Thanks for sharing as always :) Cheers from Denmark.

[@johnaustin6673]

As painful as the "wideo's" are sometimes, I cant stop watching. Keep up the good work and be safe. I work with many types of two strokes, and have always loved them.

[@postaroland2014]

This build gets crazyer and crazyer with every video.. Keep it up, great work!!

[@gpzephyr]

Never in my history of watching KZbin have I clicked in a video so fast. Excellent choice Alex. I have a RS50 with various AM6 engines in multiple states of tune. Careful you don't miss a gear though. The standard selector drum is awful for finding false neutral gears. Can't wait until the next one

[@att49356]

Hiya, I've had multiple AM6 engines too, i think the AM6 "gearbox" problem is simply gear spacing and speed of rotation. I actually prefer the standard drum, but always install 0.9 spacers between the secondary axle. Also, I spend that extra euros on the Top Performances straight cut teeth clutch basked. This way the gearbox rotation speed is vastly reduced, allowing the gear to be set in the right position and not to shift out. That is it basically... Never had any issue on false neutrals or falling out of gear, even between the everywhere known from-5th-to-6th shift.

[@gpzephyr]

@@att49356 that's very interesting. I have been through many different shims to make it better. I tried the TP shift drum and found it helped and left it as that. What you say certainly makes sense. Might well give it a go on the next AM6 build

[@att49356]

@@gpzephyr Yeah please try it! It really gives that extra pleasure of riding when you don't have to worry much about giving the kick when shifting. Also, all shims could be installed brand new, i never reinstall old in gear shims just to be sure. What version of RS 50 do you have? I own an old Poggiali Black and I love it.

[@bradappel9928]

Tones of progress this episode 👏 I like the direction your heading. Keep up the great work. That bike frame looks nice.

[@OddsandEndsMachining]

Good update, I’m glad this is happening, I suggested using another engines gearbox about a month ago when the chassis dyno wasn’t going well.

[@MarkCoatesKwadrin]

Your project is about the journey and there may or may not be a destination but that does not bother me. Just happy to be along for the ride. Have a creative week!

[@heikoscheuermann]

To me one of the special bikes during the 90s was the RS80. It was a RS50, with 74cc kit which was renamed to RS80 in the papers. It had TÜV, was registered as 80cc and all of them were WAY too fast for a 80cc (the law said 80kph 😅). And she was one of the best looking and had good handling.

[@EllaBananas]

Love how these videos have been coming together lately. Really nailing the vibes of tinkering in the shop.

[@dangerfpv8516]

oh man no need to apologize for ending a video like that. we want content good bad in the middle we dont care. we hungry out here.

[@danielostman5805]

I have been thinking for a long time now that something like this would be a great solution for many of the problems you have. I think this is a great idea and I think this will be the best solution yet! Keep it up 💪👊

[@rowantrefz8906]

So much work on your projects, stuffed into one video. Incredible!

[@bramvermaat1453]

So cool to see this RS50 finally after seeing it in the background many times. I own one myself for 10 years already. Just can't part with it.

[@Doompjez]

Keep it! They are becoming rare. I had one for 15 years.. then someone set in on fire, it was completely gone. I was devastated..now I bought an RS 125 (140cc), it's amazing. Still miss my RS 50 though.

[@anthonyrobinson8616]

Your introductions are starting to look like a Wes Anderson movie, which is great!

[@Williams_Trucks]

I just want to say that you're amazing, I plan to make a built 150 4 stroke in the future. I ride a 2018 GSX-150R. It is the Indian version so it isn't as fancy or as fast. Right now I built a 1982 Suzuki GS125 tank and headlight onto it. I got into a major accident and the bike was written off because of cosmetic damage, insurance companies won't try to save small bikes. We didn't get paid off either because I legally can only ride a 125. So far the bike is quite nice, it has a nice thumping sound when I do a cold start.

[@trashmaster12345]

Don't forget to fill the crankcase with oil. Just enough so the bearings get some.

[@2STROKESTUFFING]

👍

[@wags9777]

You know your a mad genius when you can mount an engine on your engine with any success.

[@backyardrestorations]

I’m so glad you have one of these!! I have one too I’m trying to pimp out to make competitive in minimoto racing.

[@AutoBeta2T]

Just had a flashback to my days racing an Aprillia RS 50 and rebuilding the gearbox 😅

[@fredmitchel1236]

Lots of laughs...maybe the gear box ...needed a different oil...?

[@AutoBeta2T]

@@fredmitchel1236 as I remember it was just getting the shiming correct... Had a false neutral. We used to use ATF in the gearbox.

[@fredmitchel1236]

I see....the engine itself seems very powerful. I was looking to see that engine on KZbin... Does it have a power valve? Just curious

[@AutoBeta2T]

@@fredmitchel1236 no power valve on the AM6, well not in the RS50. With an aftermarket cylinder, pipe, carb and ignition they go very well! We had about 14hp but you could get more...

[@fredmitchel1236]

@AutoBeta2T Amazing power...without the power valve.... I am now interested in the China Doll 66cc....but they seem so crude...I have some ideas to make them better....sell like some little upgrades...prove myself in a race or at least a top speed video I would like to start with parts from a better engine...like the Aprilia..... Or a KTM 50 or 80 cc.. I will look up the Aprilia aftermarket parts... Old dog here...stated with home made gocarts made from broken engines found in trash...then QA50.. Cushman Eagle, Harley 100, Lambretta 175, Yam LT1-100, Ossa 250, Bultaco 250, Can-am 250, Maico 400, IT-465, IT490, Husky 500, Now I have KTM 380, and KTM 300 bought new in 2017.. then there is the KTM 550, and a YZF450...and my Yamaha Thundercat .. I love the 2 cycles...

[@bradley3549]

I love everything about this contraption.

[@robertpierce1981]

Looks good Alex. Keep making progress

[@teropiispala2576]

I have made timing belt pulleys with lost pla casting on plaster/sand mix. They are not as pretty as commercial ones but work well. Hole and sides can be machined but teeth work as they are. May not be worth of trouble to make instead of buy but when building things is. The point is you can have them when you need them without stupid waiting. Just print the part with light infill, bury in blaster and burn away in kiln. Can be casted from aluminium, brass or bronze. Aluminium bronze is interesting material. Aluminium is easy, others take some practice to get right.

[@shedstuff]

Glad you made this change, this is a much better test rig

[@oopartuk]

Always happy to see a new vid from you sir - when you made the engine stuffer thing I assumed you were 3d printing a piece to get a good fit, and would then go on to use it to cast an aluminium working final piece!

[@joelleino4507]

I've made many intake manifolds from pla and no problems.

[@jeffflanagan2814]

I like the direction this is moving!

[@EddieTheH]

The last 8 hours since I got this notification have been the slowest hours of my life. It's a bad day when I'm doing something I can't postpone for a 2SS wideo!

[@johnpezaris6982]

Your comment about the brute force engine while holding the drum valve assembly reminded me that the best you've had so far has been the brute force with the roots blower. I'd like to see you go back to that. It started instantly, and produced gobs of power. The rotary valves had too much friction, but I think you gave up too quickly on the drum valves after the chains bound up.

[@dwaynecoomber6610]

this is awsome its brilliant 👏 😀 can't wait to see it working fingers crossed it works out and gets you over that hump you been battling with.

[@WireWeHere]

Noticed your hands thinking about what to do with the belt tensioner and... Remember to tension the slack side of the engine to jackshaft belt as in locate the tensioner mount to the front with the idler pushing backwards against the belt for this particular iteration. Just a reminder.

[@fredmitchel1236]

Very good job..and you certainly accomplished a lot

[@fredmitchel1236]

I thought you were going to show off and single point the M10x1.5... My Sheldon 6x36....won't do metric threads... I love your hard work and persistent..

[@andersson.l.e]

Nice video, as always. Hope you will get some nice results soon.

[@WireWeHere]

Straightened a few shifter shafts along the way with zero problems a new seal couldn't handle. Even used a 60 inch Jackall to do the detail work once while smacking ourselves crazy just north of the Ms. Mosquito Power Sucker training ponds.

[@geemy9675]

ever thought about repurposing the 50cc in a race bike frame (once you've bear the land speed records) ? it seems at home in this rs50 frame..you would probably have to work a lot on the powerband, exhaust valve, etc. but in the supercharger scenario you could also run it with a smaller displacement supercharger to move the power and a little bit lower

[@ktmtragic1397]

Mate your persistence is truly amazing ! Great job

[@lookronjon]

In 1981 I put a Jawa 50 cylinder on my puch moped. I put a 17 mm carb on it. Tomos rear rim. Suzuki tm 75 front end and wheel. It ran 51 mph on flat ground. Over 60 going down the bridge going to to beach. I got speeding tickets on it. I did the work at school in metal shop. Had to make a spacer. I didn’t know a whole lot and I got lucky. It was so fast. My teacher was more surprised than I was.

[@williamgoodwin9667]

Omg what a great video. Didn’t think you would use plastic in the engine unless you were sure it could handle the temp but I still feel a knew part maybe in order if it needs plastic in there. Keep it up buddy almost there❤❤🍄

[@dirtboy896]

Man you read my mind!! Before 7:00 in I was thinking “man just solid mount the engine and build a gearbox transmission”. Great minds think alike

[@olasod1]

Please make a video where you explain your plans for the future. Has your channel become a job only, or do you still aim for something specific? Boneville, a hp record for a 50cc twostroke or whatever you aim for?

[@davidf.8497]

ALex, is that a tear we saw, before optimism kicked back in? ;) I like the way it's taking with that stand alone gear box. Keep it up!

[@TheWelderandrew]

Ting Ta Tid my man... and i love every second. Still WANT to ride that thing when done, ill travel with kit and smile....

[@johntenhave1]

Superb editing job and ever interesting content. keep going!

[@ogKEGGY]

The deathtrap build convinced me to build an AM6 swapped bike here in the states, so I bought one as soon as I saw one pop up for sale (they're really rare here), but I got rid of the bike I was going to swap it into lol I've been trying to think of another use for it ever since.

[@michaelfackler9716]

Lock-tite should be your favorite go-to if you don't want to loose a "NUT" , any nut , be safe . Good job!

[@randomname4726]

I actually liked the music :) And as always, great video.

[@TheWebstaff]

I miss my little RS's had 50 and 125's... My big bikes nice but I miss that agility.. And so easy to work on. Could do a piston change in under and hour..

[@NuffMan_]

Use lathe way-oil in chains, it stays and wont attract dust/dirt. That what we use on hi-torq tractor pto driven implements like baler and it works way better than anything else we tried :D like chains last 10x longer than with other oils

[@nerd1000ify]

Chainsaw bar oil might also be an OK backup if you don't have way oil. It is similarly tacky so it won't sling off.

[@johny79action]

I realised today why I love your videos so much, I'd much rather see a human doing! than just a human being ;).

[@Eddaux]

love the videos been watching for ages, but whats the goal now? if you're planning on going back to a supercharged aplication, verifying the cylinder and port geometry NA might just be a waste of time. Because with so many veriables, pipe, boost pressure, crankcase volume etc; a cylinder that works well in a NA application doesnt mean it'll be suitable for a forced induction set up. thats what i thought the main purpose of having such a large crankcase volume was, to act as a "resivour for boost" due to the 2 stroke cylce, in theory there's not really and reason why that cylinder wouldnt work on a normal crank case design/volume. so isnt it a waste of time to get something working that you know will work eventually when your end goal is to run the engine with a supercahrger and large crankcase volume to suit? keep up the awesome videos, always fun to watch.

[@ramazan0124]

i have made the aprilia rs50 rev to 16700RPM by porting the cylinder and everyting else stock, honestly it is a well thought and built scooter/motorbike

[@Norwegian71]

What a nice Aprilia 😁 Kult å se at det skjer ting med den nå, har ventet lenge på dette 😎 Glenn

[@2STROKESTUFFING]

😁👍 Takk igjen Glenn!

[@Norwegian71]

@@2STROKESTUFFING Bare morro! 😁 Keep up the good work! 😎👍

[@optimusprimer4392]

The anxiety of waiting for PIP to be roadworthy is unbearable LOL can't wait to see this little animal in action

[@frankiejoseph3792]

The RPM's and the torque curve seem on point 🐎 you definitely know have my attention... Godspeed 🔥

[@dennis-nz5im]

K jet depends on flow and pressure differential can be adjusted. I bet you could get more from that.

[@tinymotogarage]

Drag it out as long as you like amigo - we're not here for the destination, but the journey.

[@PenryMMJ]

Seeing you squeeze a 2nd engine into the RS50 frame send me down a rabbit hole of total madness. Would an opposed piston 50cc 2-stroke give more power than the current design? It would mean starting again from scratch, and engineering such a device would be a huge challenge. Total madness. I feel guilty for suggesting it. But you've probably thought similar thoughts already.

[@2STROKESTUFFING]

Same thoughts the moment I put the engine into frame😁

[@nerd1000ify]

In principle the more efficient uniflow scavenging should make more power. It should also be more suited to boost, by offsetting the crankshafts you can have asymmetric port timing (exhaust closing before intake).

[@geemy9675]

I never understood why going for a variator to Dyno your engine, with a pull in fixed gear you get way more information about the engine within a range of rpms, and you have fewer loss

[@Grooty79]

Might be time to machine up some cases for your engine with the gearbox attached

[@roboman2444]

With the clutch, you should be able to measure the losses in the gearbox and correct for that. Probably a more accurate reading than the variator.

[@roberthoffmann6603]

I like your art of process

[@lesenegalais]

What about mounting the engine on a parallelogram? It would remain in the same axis as the variator closes and it would make for a much sturdier engine mount

[@danijuggernaut]

Just a question, i allways wondering if you never had problems with hydrolic lock in te combustion chamber due to unburned fuel accumulation. The cylinder looks downward. Hydraulic lock is a big issue on old aircrafts Row engines, the lower cilinders had allways to be drained by opening the spark plug. Probably a lock will not occur, but detonation due to a momentary high compressio ratio can happen. Cylinder downwards is anyway a great setup....low gravity point, excellent.

[@2STROKESTUFFING]

Never noticed problems, but could actually be what's screwing up rev-ability. I have to pull the plug and drain the engine before every session.

[@Orbacron]

Now this could be a going to town rig here🙇🪶🏍️

[@mistermacgray]

Thanks for telling us what material you used for the stuffer, I'm very suprised the PLA is holding up to gasoline and heat, at best it is good for making figures or prototypes of things. PETG should he good along with CF nylon, best thing about PETG is its a smoother surface but wonder how well that would help/hurt perform vs the flatter surface (porous) of CF nylon for fuel/air to get by. Anyways, now to continue watching!

[@paultinwell5557]

Here's me thinking the "Blur" was in reference to the impossibly short depth of focus currently in favour. Sadly not. Still, never mind the fuzzies, we're off down a new rabbit hole... where will we end up this time? At the entrance to another rabbit hole of course!

[@tomdarnell4369]

All fabrication work takes time. Lots of time. So much time. Not that I have ever had to deal with that kind of thing on my own projects or anything.

[@davidpaulsen2681]

You should take a look on the Honda CR500 twin engine. 1000cc 2stroke. Guud Looord!!! Glorious!!!

[@danijuggernaut]

Man, i like this Speedway Chassis, very very cool. Would be a crazy project make a Speedway bike for street use (obviously equiped with brakes, hahaha)

[@DavidHornblow]

2 Stroke Tropico! My fave channel

[@evilelf5967]

And the birth of the "frankenbike" begins......got a good feeling about this one.....lets see how it behaves!!!

[@skyfreakwi]

You could add a slave pulley behind your variator. They just have a spring keeping them shut. You can rigid mount the motor then. Problem solved! Except for having doubled the rpm shift.

[@natediaz9227]

Could you wrote a electric fuel pump that was in line to a 2 fuel pressure regulator to a carb to change your mixture easier and more effectively or no just a question

[@tirijalito]

Amazing video: amazing content and amazing selection of music, enhorabuena.

[@digm0repaka]

Thanks for the hours of awesome content! I've been following the series for a while. I think it's time you should go EFI, running a pressurized fuel system you can avoid a lot of the vapor locking and vibration issues of a carb, tuning is also way easier not having to faff around with disassembly, just changing a value on the computer. You could also potentially try direct injection into the transfers - Such as KTM did commercially, it might help with the large crank case volume. And if you want to attempt mounting your cylinder to a commercial case, check out the Jawa 20/21/23(220/221/223, "Pionier"), it has quite a lot of meat around the flange and cylinder goes forward resulting in zero obstruction around the flange. Jawa Babetta(type 207, 210) could also work, but the casting is a lot skinnier and comes with a 1speed/2speed automatic instead of a regular wet clutch 3 speed

[@fullsendmarinedarwin7244]

I’ve lost count the number of times EFI has been suggested. Seems like a no brainer to me

[@2STROKESTUFFING]

😁 True.

[@2STROKESTUFFING]

Already got a Babetta🤔

[@digm0repaka]

@@2STROKESTUFFING I'm not sure how large your cylinder is, but if you do try to machine the babetta case for it you may need to weld on a little bit of material on the clutch side. With 80cm3 PA80 cylinders we do that as when it's machined and ported for the large liner and transfers it goes past the original casting there. If you want help with EFI feel free to get in contact with me, I am currently working on some 2 stroke EFI stuff as well.

[@KingKarlito93]

I like this direction, should fix the gearing issue and get rid of the over complicated variator set up and it looks like something you could actually ride

[@willemgjaltema2996]

It think now you turnt your cilinder +/- 180 ° it react beter . Can you tell about that ?

[@niklashultkrantz7766]

Thanks brilliant I'm not sure so that engine have 2 crank cases it looked tall.

[@JoelArseneaultYouTube]

This should be a lot better platform for testing the engine and yes, designing and building one of custom parts is very time consuming.

[@CC-pj7iy]

A return to form. Great video.

[@ronaldbunk9007]

Thanks! That's really a Frankenstein build! I love it! Maybe a redundant question but wouldn't feel injection of some sort be a better option? Or is that difficult with the crankcase and ports to realize?

[@balazscsallo]

Hi Alex, there are crankshafts on the market for the big bore am6 engines with longer rods. Couldn't you use this type of crankshafts with an adapter plate between the case and the cylinder, and forget your crankcase and crankshaft? So your whole engine would be a compact unit.

[@Orbacron]

That would be fun to have a gearbox

[@MrJermbob]

I wish you were closer to me i would have you setup on a efi system and help you understand how easy it is.

[@MrJermbob]

I also see no difference between a manual gearbox and a manually foot adjustable variator....

[@2STROKESTUFFING]

👍 The main problem is the engine being allowed to move back n forth causing fuel foaming. I've run several bikes successfully with this setup tho, but better to leave it for now.

[@MrJermbob]

@@2STROKESTUFFING I dont think it really is. Especially with a pumper carb. You think your motor is vibrating more than a KT100 go kart motor on full rip ? I dont.