My New Stunt Moped Build Is Insane!

About time I finished up this build and got this video uploaded! In this video I take my moped from a frame and an engine, to a fully assembled moped ripper! As you can tell, a Moped project is truly never finished, so of course we still have some more work to do to dial this thing in perfectly!
Links:
PrymeMX cleaning wheels~
www.prymemx.co...
Moped parts all purchased from Treatland.tv
www.treatland.tv
My Merch!
shopjway.com
Thank you all so much for the constant support! I love you!

[@BIKELIFEAP]

Go buy a set of black zip ties you will appreciate the final product and finish plus it compliments your painted covers

[@TwoStrokeJ]

Yep white ones is all I had at the time haha but I’ll probably switch to black at some point

[@wiesvanberlo7141]

@@TwoStrokeJ and maybe some sleeves for the wiring harness

[@0ctagon_]

im glad someone else noticed it too because it botherd me the entire time

[@stijn7804]

check your exhaust manifold it is probably 25mm you can go to 28mm it helps for higher top speed Good Luck!

[@ap-mr3st]

great welds for the it being your first time

[@TwoStrokeJ]

Appreciate it!

[@kylebeckett2935]

thats what im saying dude those welds honestly are amazing looking

[@nightrunnerstv]

Factual

[@thunderlessemoto1209]

FUCK YEAH FINALLY MAXI CONTENT! Dude keep the maxi videos coming.

[@TwoStrokeJ]

There will be more brother!

[@Jamal_sml]

Were back boys

[@TwoStrokeJ]

can't believe I always leave you guys hanging for so long

[@THISLOVETHISHATE99]

@@TwoStrokeJ u should switch to the Runleader Digital Tach Hour Meter Engine Temperature Gauge so u can also get RPM and TEMP and u may want to pick up the permakit cdi box from treatland i plan to get it for my kinetic tfr usa once i get a needle bearing crank and 46mm kit

[@davessparetime83]

The welder, use more heat and slow down the wire feed a little. Yopu need more penatration in the welds. The weld should look more dished than the raised bead. Get a Magnesium plate (Sparks) for the wheelie dragging. You want more RPM then increase rear sprocket size.

[@TwoStrokeJ]

Thanks for the advice brother!

[@dirtbikemike2956]

@@TwoStrokeJ you can hit the piece you want to weld with a blow torch before welding, it will help with, penetration😏

[@steammartian7705]

I’m not a great welder. But metal I pick up on pretty easy. That angle iron u could cut the sections out u want for flat stalk. And make it all one unit. Cut your pieces at 45 to make a 90. I think ya didn’t pretty well. I’ve only got down welding mufflers. So your doing better than I am 😂 thing it’s pretty cool. I give it to all of us who ride small bikes and make them wheelie. Doing the impossible. I stunted out a gs500 bud. People think I’m crazy and ask me all the time how I do. Know how buddy.

[@pllepolle8162]

a suggestion to the power problem, based on my own experience, would be the gaskets leaving the piston too far from the cylinder head at TDC, sometimes the gaskets they send you are ironically too fat, the exhaust you have could also create a weird powerloss, due to it being a large exhaust on a bike with a crank and port setup for low-mid range power, definitely check for air leaks at the reed valve, the gaskets there are annoyingly often not good for the puch tuning parts, the channel "Puch Praxis" is german but has extremely many videos (with English subtitles) that are super valuable to anyone who wants a maxi 1 or 2 speed that can rock 50mph reliably. personally I've had a few maxis and other old mopeds, the best results I've seen on a maxi was 65cc polini mixed with a swiing cigar exhaust, 15mm carburetor and some offbrand electronic ignition, ran 45mph on a dyno with 6.5hp

[@TheMrCherne]

Dude that clutch problem would drive me crazy!!!!!!! AHHHHHHHH

[@TwoStrokeJ]

Yea it’s not fun and sucks and the bike is still slow after all the work haha. Still more troubleshooting to do

[@LeftLaneTdi04]

Lighten the stock clutch and Get a crankpipe on it. will be a whole different bike

[@occasionalcomments-go3mx]

@@TwoStrokeJ Were you using ATF with the CLAW shoes? Stock needs it but as soon as the bike heatsoaks the type F turns to water and you get no slip. Full synth 10w30 is probably best for slip (and engine wear) or CTF-R if you want super grabby race fluid. I do 4oz 10w30 1.75oz CTF-R and it screams. Sweet ass build, love the front and rear disks + powerdynamo, no expenses spared.

[@albudracingsanna323]

You need clutch in 3 parts with red coil

[@albudracingsanna323]

And black zip 😅

[@FadriTruog-c1k]

really cool content, i come from switzerland and our country is the mother of mopeds. I have a sachs 503 ABL CH which is from 1965 and runs pretty good

[@ubereatsgoat]

Yo bro a year ago I hated these old mopeds and begged my dad to buy me a scooter then I found you and saw your Puch Maxi videos and I fell in love with these mopeds and you inspired me to get one and I finally found the one its a Tomos a35 yr 2000 and im going to get it on Monday. Thanks for uploading these moped videos

[@TwoWheeledPotato]

I'm not one for mopeds myself (i ride a vstar 650) but anything on two wheels is fun and i can get behind anything. enjoy and stay safe my friend :)

[@ubereatsgoat]

@@TwoWheeledPotato thanks You too :)

[@justlo0k33]

You need the kickstart clutch springs, and possibly a better exhaust. Also jetting can hold you back.

[@justlo0k33]

Oh and the magic tranny fluid 15w-40 rotella

[@shintokatana17]

I love this build. Very cool. I wonder if you can get your hands on a Simson S51 over there. Thats the number one old school moped here in Germany. Lots of tuning and huge aftermarket here.

[@TwoStrokeJ]

I’ve seen those so much and I would LOVE to build one, but they literally don’t exist here. It would be very expensive to import one, and all the parts for it, but maybe someday!

[@cowboywonton]

Love the rebuild. But time for a bigger pipe for better top end. May want to look at a side bleed to prevent the baffle from scraping when you wheelie

[@TwoStrokeJ]

Next time I rebuild the engine I am gunna go all out 74cc, custom pipe, all of that

[@cowboywonton]

@@TwoStrokeJ hell yea. Keep up the maxi content! Cant wait to see else you do

[@catte7760]

@@TwoStrokeJ should get a hpi ignition with it then too they make a huge difference in acceleration but u might have a little problem with wiring

[@kida_mnesiac]

@@catte7760 Powerdynamo is probably hands down one of the best ignitions you can buy for E50/ZA50. HPI minirotor is good but known to be failure prone (once it goes kaput the whole stator is toast). Treats wicked curve is probably a better alternative to HPI especially given it uses the Parmakit box (more "practical" timing curve), and you can run DC power with the regulator they provide.

[@catte7760]

@@kida_mnesiac hpi here one of the most populair ones but i agree i always see them fuck up or fuck up the clutch but they do give a big difference in power

[@graffie]

That exhaust is 100% the issue. The tail of that pipe is like breathing trough a straw.

[@keekeighteen]

yea you are prob right

[@vulpeasamurai4209]

yep

[@FadriTruog-c1k]

And a tip for the rust, in switzerland we have some stuff thats named Owatrol it like seels everything and they won`t get rusty anymore

[@dahlmasen3084]

Nice restoration👌🏻 Always nice to see old mopeds being restored instead of just destroyed👍🏻 I don’t really like the overall look of the bike with that seat and the modern lights, I like it more old school, I guess mopeds isn’t looked at the same in the US as in Europe though… But I’m not hating, it’s your bike and if you like it it’s a job well done👌🏻 And I understand that it’s a stunt bike and built for that and not for the looks😅 Everyone should do their build the way they like it👍🏻 I hope you’ll get the clutch and rpm problem sorted out soon and that thing will be so much faster! Mine does 49km/h with just an 3,5hp Airsal 50cc cylinder and a 28mm exhaust

[@noahsvejstrupharre6857]

well if you want more power a inner rotor ignition would help alot, trust me im danish. not that there is not more then that you could do, but its a good starting point (other ting you should/could adjust are: the Needell and jets, the ports in the cylinder, get the right squish, flow optimizing the block, stuff like that you know😁)

[@domcxz8643]

Your channel is a banger. I built myself a motorized bicycle because of you. Thanks bro ❤

[@TwoStrokeJ]

Thanks for the praise man! All love, hope you are enjoying that bike!

[@Rkoeb555]

Puch Maxi all over the World . Nice build .

[@leivanpaahdin22]

the rack looks really good for it being your first weldings

[@TwoStrokeJ]

Thanks man! I’m sure once I paint it it will look even better

[@burtmcgurt3584]

It looked like your foot got stuck, I would widen the end so that doesn't happen. Super solid fab work though!

[@davidlumgair3499]

Amazing build mate, seems crazy loud ha ha

[@billyking722]

You go for it young blood we all started somewhere you are doing bloody well enjoy the next project I am sure there will be many from UK

[@naviramos]

Doing great!! 👍 Taking it there.

[@TwoStrokeJ]

Thanks man!!!

[@charlesgraham9954]

looking sweet bro, and sounds awesome. be safe, but have FUN.

[@fightingfanproduction]

I love this channel. Great videos have been watching for a long time

[@Waltervazquez599]

Fantastic video my friend like and Greetings from Argentina 🙋🏻‍♂️

[@Stunt-Ludixx]

Puchmaxi wauw i build tons of these when i was younger this is also the girls version, (most populair) you build it really classic with all the chrome, nice build👍🏼

[@gabybikelifepr9188]

you know ia good day when J uploads a video

[@TomasCatarino]

Today is a good thay finnaly 2 stroke jay video!!!! Now we need the rmz 125 :D

[@TwoStrokeJ]

Coming soon!!

[@iwanawithyou]

yes, rmz125 in the puch 😆

[@timu_3727]

Fire video🔥much love from switzerland

[@TwoStrokeJ]

Thanks bro!!!

[@jesse4210]

Great video. Love my Tomos!

[@TwoStrokeJ]

I’ve been thinking about building a Tomos! Seems like it would be a fun alternative to my puch

[@Stolas1777]

Man my streetmate got rained on I have to fix so much there is not better feeling than balling down the street on a Tomos

[@chris-xy5fm]

You can make the top speed faster by getting smaller rear gears this makes the top speed faster but you will have less torque

[@keksiman7203]

Damn that bike sounds good! My old finnish puch engined moped could never 😂

[@wc7568]

double check your timing and spray down for air leaks. 16x44 with a treats reed, proma and powerdynamo should be HITTING hard at like 4k. Sounds a little lean to me. What temps are you hitting?

[@scarmanee]

the sounds remind me of when i use to take my 50cc motorized bicycle to high school.

[@RanouttaTalent]

2 Things: a sandblast cabinet from HF will pay for itself in a few projects. Secondly they sell naked crimp connects, which along with some glue filled marine heat shrink, is the best of all worlds. It's what they gave us for factory harness repairs as a Ford dealer mechanic.

[@RDRISLOL]

Bro I actually love your videos ❤❤❤ I Fukin love it❤❤❤

[@RDRISLOL]

Watching for 30 minutes is worth ❤❤

[@loganclark9111]

Hey when your spray painting spray off the side of object then walk the sprayer to the object your working on and keep walking it until your off the object and then stop spraying. This will help you get less dripping and runs. Also those welds are realy good just keep practicing you will get very good at it also whatch videos on welding it will help.

[@skrotis9737]

Check the timing. Might just be the spark occuring at the wrong time? Might aswell be a carb issue. If you run it WOT you should see the temp rising if timing/jetting is wrong. Good work with the moped so far and good luck sorting out the RPM limiting problem

[@kadenwhite9992]

those welds are accually really good for youre first time

[@elchefe4586]

Vid was fire 🔥The rack looks sick! The maxi is looking sooo fresh 👌🏻🙌🏻💯

[@Hyrax_Matoi]

It seems you have a Proma CC 25mm exhaust. E50 70cc kit engines tend to run better on 28mm pipes. I would suggest trying a Homoet p6, or a Technigas Next. These exhausts pull a little slower, but tend to have higher RPM's. Might want to play with your gearing aswell. Hope this info helps you! Love your vids on the Maxi.

[@Hellsatanx]

welds look good actually, nothing to worry about

[@jonahcowans9073]

I have two original mopeds from Peugeot and Motobecane. The best way to get power is to put a racing centrifugal clutch on it in both 75cc, and 99cc setups water-cooled or air-cooled. Also run the original throttle they work amazing

[@jokestrokes]

Yeah puch maxi vids 🎉 greets from austria 🇦🇹 bout to get myself a maxi soon 😂🤘🏼

[@TwoStrokeJ]

Thanks man! All the way from Austria! Good luck with your own moped some day

[@shaquille_oatmeal125]

on danish moped they ship with a limiter by the variator maybe check that btw its a sick build

[@waldmeier5788]

Just as a advice, buy a 3 jaw clutch (HK or DMP), then a better exhaust with a 28mm manifold (personally I rate some homoet p6, a cigar exhaust or a MLM) for your setup. Good luck and best regards from Switzerland✌🏻

[@TwoStrokeJ]

Thanks man! I may try a 3 claw clutch, maybe that could help! I want a different exhaust eventually too, but for now I’m going to work on perfecting the jetting and the timing first

[@dillpickle_6931]

I’m 16 and recently put a 70cc kit on and I had your same problem only going 32 , try going up on your jet size in your carb bro I did that and added 15mph to my top speed. I went from 52 to 74 main jet it makes a huge difference try it bro I would love to see more vids of the moped!

[@Bonsaiman1]

Only thing I would have done differently is use black zip ties and i definitely would have ridden it longer than anyone lol awesome video and awesome bike thanks for sharing 😊

[@thijsrehorst4040]

yo man fan from the netherlands here, as a clutch setup here we use ktm clutches from the 50cc ktm's hope this helps

[@whirlybirdrc]

What you need is a KTM SX50 clutch set adapted for puch. Or a 3 claw atleast. The stock (even the ''upgraded'' ones are garbage) Like the look of the puch, that classic brown color is perfect! Greetings from The Netherlands. 😎

[@TwoStrokeJ]

thanks for the advice man! I wasn't sure if the 3 claw clutches were better or not. I did see the Kim clutches, I bet those are the real deal

[@petervasegaard7603]

this is not to judge, just to help you next time you weld. the spot where youre welding, needs to be cleaned so its clean metal you weld on, and try going in circles when welding😊😊

[@SGmotorsport9590]

Great video J. I just had an idea, you can mount an titanium plate or some of those flint skateboard things so that when you scrape in makes a sh!t ton of sparks. Oh and btw your boy finally got a scooter. It's an old beaten up yamaha, but it has a license and it uses the legendary minarelli horizontal. Sick build. Have a great night/day

[@TwoStrokeJ]

Amazing man! That’s a good idea though! And sick that you bought your own scooter, Yamaha makes some great ones!

[@Omgkhii]

The algorithm still loves you man😂🔥

[@TwoStrokeJ]

I hope it does haha glad people are seeing the videos still!

[@murdasherote383]

nise man I Just Built My TTR 110 With a BBR 130 Bore Kit and i love it Nise Moped

[@TwoStrokeJ]

That’s sick man I bet it rips

[@murdasherote383]

@@TwoStrokeJ dude i just Finished Watching your vid my Fav part Is The Wireing i thot it would be a pain in the ass I guess not Tho Pretty cool that its 2 stroke Nise build Probably the most sick Moped there is

[@CoyotePathkiller1998]

For never welding that practice weld was beautiful

[@edue2739]

where i'm from (Denmark), my buddies and i started riding these bikes at 14 not specifically puch but mopeds in general, they are very fun on group rides and small road trips. One of my buddies had kinda the same problem with the rpm, his bike didnt get enough fuel

[@muzamilzaman8772]

It’s my dreams to own one of these

[@MyaSooon]

i was just rewatching your old moped vids today! Was hyped asf when I saw the post noti 😂

[@TwoStrokeJ]

Let’s gooooi

[@rafaelgalindo841]

Love your videos! The upgrades and DIY assembly is so rad! Have you tried adding a different exhaust? I have a feeling that the narrowing towards the end of the exhaust acts almost like a restriction? Not sure I’m sort of a beginner when it comes to Puch Maxis 😅

[@Diodibrando]

Great job, your content inspired me to buy a moped and modify it,

[@TwoStrokeJ]

Good luck man! It’s hard work but very rewarding when you get things done right!

[@Diodibrando]

@@TwoStrokeJ Thank you, if you want to know what moped i chose, it's a Piaggio Zip Fast Rider from 1994 2 stroke 50 cc(yes I'm from Europe). For now i've done a 86 cc kit, bigger carb, clutch bell and weights(Polini), clutch springs (Malossi) and digital dashboard. Stock it does 35 mph, modified 67 mph which for mi is enough

[@swissjanu3455]

hey man, you got the proma cc exhaust on this bike, its a good exhaust for 50-65cc but not for your 70cc kit. The proma exhaust is only good for mid rpm power but not for high, and your cylinder is more for high rpm made. put a homoet p6 exhaust or something like this on it.

[@_wolfwastaken_]

love the build and mostle the helmet never seen anything like it .

[@TwoStrokeJ]

Haha thanks man! I love my helmet too

[@neoolsson3697]

Ayee finally a new vid🔥🔥🔥🔥 Lowkey thought u was dead

[@TwoStrokeJ]

I thought I was too low key. Gotta get more consistent with the uploads

[@OLDSCHOOL-MOTO]

I myself have a puch maxi, all original and it hits about 30mph. and you have a 70cc, yours can go much faster if you tune it right 👍i think you can make it!

[@OLDSCHOOL-MOTO]

its not all original i think: 50cc 12mm carb 12 in front and 45 in back

[@GwnSerchan]

Lets goo dude! Sick video. I stil think the exhaust would be a great upgrade also 19mm carb it could be bigger but then also might run hotter quicker

[@TwoStrokeJ]

thanks man! I was thinking about a custom exhaust., may get one in the future

[@jonahcowans9073]

After seeing where your at with it. Add heavier ball bearings to the clutch they should travel farther allowing you into the 60mph range

[@A_Adml]

Broo that moped is fire 🔥 keep up with the good work ❤

[@TwoStrokeJ]

thanks man!

[@TwoWheeledPotato]

28:19 read plugs and see what your mixtures are like, you probably need a larger main jet (maybe even by 3 sizes)

[@TwoStrokeJ]

yea I am definitely going to check the jetting

[@starstencarl9110]

I think you need to choose a leaner main jet. If the Spark plug is already dark Brown, then try to set your egnitiona bit later. If anyone has any other tips, please comment. :) following you since 2 years, love your content

[@TwoStrokeJ]

Thanks man! I think it could be either the jetting or timing, maybe both. I will be checking to see how the spark plug looks

[@f4rexk163]

hi, i recently rebuilt my own puch maxi S and i had basically the same problem its prolly not the clutch but the ignition you definetly need to check that using like a flash gun(idk what the name is in english im from austria), could also be wrong main jet so just check the spark plug, there are many things you need to adjust in the ignition for it to work properly just ask if you ned or watch a tutorial. Love the series btw!

[@TwoStrokeJ]

thats true man!! I think my problem is a mix of ignition timing and also jetting. I am going to try and work on improving both!

[@LeePackers]

I was waiting for you video for so long finally I am happy keep on going please please you are the only youtuber who is notification is on in my device

[@LeePackers]

Love you so much brother from India

[@LeePackers]

I am watching your video from 2 years finally

[@TwoStrokeJ]

this is amazing to here man! Your got me motivated to start working on the next video!

[@TwoStrokeJ]

all love brother

[@TwoStrokeJ]

I appreciate that!

[@alekboi4016]

Hey man, I am restoring an old Yamaha ag100, all electricals on it is shot and its hard to find original parts, plus they are expensive. A video on how to do custom wiring harness would be good😅

[@mandel4889]

Try upjetting until it 4strokes then go back until it stops. After that adjust rear sprocket

[@Jeekinz]

Fab a mount for the TrailTech. Zipties are cheesy.

[@Printcz_official]

Amazing video🔥🔥🔥

[@TwoStrokeJ]

Thanks man!

[@gamenvoordagen1470]

you need a hpi or pvl ignition tuned to 1.6 mm bofore tdc

[@joppy232]

That chamber is definitely going to limit your speed. My heavily ported gilardoni kisses 70 with tall gearing. You might want to conisder. Ive seen those 70 reed kits hit 50 with no problem as long as youre thorough on your case matching .Keep at it. Youll get there

[@lukaslaeng5413]

Go to switzerland there are a lot of moped riders there. I'm a moped rider myself and I love your Puch. Please answer me when you come to Switzerland. I would like to meet you.

[@piinanen]

Have you mached ports? And I think it is running too lean but might be your mic but check that. Is your ingition timing correct? I might test different sprokets too. Good luck with that bike.

[@tolis0946]

Hi two stroke J I'm a 2 stroke freak and I admire your work ... Could you please give us an update on the Honda Dio next and also tell us what you think of the Yamaha Neos 2t ?

[@TwoStrokeJ]

hey man! The Honda is running strong! I'm sure it will be in some videos in the near future. and somehow I have never heard of a Yamaha Neon 2t. Sounds cool though!

[@tolis0946]

Alright appreciate it. Can't wait to see the Dio again 😁

[@memesbymemeguyman]

good music choice in the video

[@rideyard]

Good stuff Jay🎉🎉 glad to see you’re posting

[@TwoStrokeJ]

thanks so much man! Trying to make a full comeback

[@rideyard]

@@TwoStrokeJ hey we should do that interview. Kinda dropped the ball on that one.. up for it?

[@skoggington5621]

W build my guy look insane!

[@TwoStrokeJ]

Thanks so much man!

[@dantekirk8207]

great video!

[@stormer24]

idk why but it seems like the speedometer is the most fun part on a vehicle for me, if i dont see one its like all the life is sucked out of it JUST because i cant see how fast im going xD

[@TwoStrokeJ]

Haha I know why you mean. Maybe I’ll get a digital speedometer for it

[@stormer24]

@@TwoStrokeJ i think it would definitely improve your riding experience

[@trentbikes]

Give motorized bikes a try lmao. You can try a 70cc athena sport that turns up to 12 to 13k rpm and easily hit 55mph+ close to 60 maybe more. I have some videos on that. So many things you can do!

[@Balazs001]

keep it up bro you are the best

[@TwoStrokeJ]

No you are! Thanks tho my guy!

[@awd233-11]

i wish i had a moped like that

[@TwoStrokeJ]

Luckily they are a bit cheaper here in the US than they are in other countries

[@renzzo70]

@@TwoStrokeJ here in the netherlands you pay 900 euros for a good puch that is fully stock crazy

[@stefan-mz9vd]

@@renzzo70tomos kopen voor 300 euro

[@lasse8786]

Great Video, keep it up!

[@TwoStrokeJ]

Thanks man!

[@morelcultivation9339]

try a bigger jet in the Carburetor or try move the needle.

[@nickdereus8842]

Try the polini 65cc cilinder kit 😉 and a 15 38 gear

[@pbra1nd3ad62]

This would be so illegal in Germany..

[@GRamerDim]

it's only illegal if they catch you

[@baraenbonus]

​@@GRamerDimThey're on your ass in Europe, cops "don't have anything better to do".

[@GRamerDim]

​@@baraenbonus this video isn't filmed in europe so I couldn't care less and I'm from europe

[@Hiimnatanexx]

⁠@@baraenbonusfr bro i have an e scooter in norway the speed limit is 20kmh it goes 63 but i have a speed limit key so i have it in my pocket so when they stop me i turn on the speed limit and when they stop me i be telling them they are day dreaming💀

[@baraenbonus]

@@Hiimnatanexx Nice, I got an ebike that I built, I've never had problems but if they stop you here in Sweden they will check the watt and voltage on the motor and all that bs. You used to be able to have up to 1000w with throttle that only gives asist up to 25km/h but i checked a few days ago and that does not seem to be legal anymore which is anoying, sins the motor I bought cost me like 5k sek.🤦‍♂️

[@axelnielsen6424]

The problem with the RPM's is 100% your clutch. The clutch wont engage properly because it is way too tight/hard. So put in some lighter springs. And then adjust them. If this doesnt work then try to buy a 3 armed clutch. I had the same problem as you and then i did this and now it is working very well :)

[@BeamBinge]

That exhaust is made for low rpm, you'd probably be better of getting a different one. Loved the vid btw!!

[@TwoStrokeJ]

Thanks man! And that’s true, this exhaust is way better for mid range power, not top end speed. Would be interesting to experiment with different exhausts eventually

[@mcmarc9675]

finaly another nice video. keep it up

[@TwoStrokeJ]

Glad you enjoyed man!

[@leandroklancar9051]

hey im from switzerland and mopeds are really big here i got my self a puch maxi with a 75ccm italkit maybe try using other clutch springs i would try the blue one with 15% harder then origianl i dont know if u got the same color but just look for 15%.

[@82puchman]

try diferend exhausts this one seems to limiting the rpm's probably due to the narrow tailpipe. and please shorten your cables to the right length, that looks so much better

[@IsacJo-jk6es]

Think it needs a bigger carb. When i have been tuning mopeds a 19mm was what i hade on 50cc sport cylinders