I hope you are still around. I have been struggling with this bike for over a year now. It looks like the one in the video but is called Znen with QMB139 engine. I can get it over 30kph! I have replaced everything that I can replace. I haven't removed the bolt from the carb yet or increased the jets though.
@@bikedogtor1663 I have the Znen QMB139. On the jackstand I can get full throttle RPM's but with a load the bike just seems to idle? Replaced CVT rollers 5.2g -->11g, replaced clutch, replace carb, replaced stator, plug, wires, fuel lines, vacuum hoses. On the road I get 30KPh (~19Mph). This is so frustrating. I have a #75 jet and have ordered larger sizes. The jet is the last thing I know to do before rebuild to 80cc. Any suggestions?
No big bore is too much work for this scooter and actually now it runs very well. Didn´t expect the 4 stroke 50cc to run nearly as well as my 2 stroke scooter.
@@bikedogtor1663 - For what it's worth keeping it closer to the initial design will always provide the best relation between performance/ reliability and of course COST! We're in a bit of ridiculous situation since all these engines where designed for more power and delivery. But nowadays due to restrictions are really tied up. Negatively affecting performance and regular usage! A pity! ;-)
@@bikedogtor1663 ich gebe zu ich habe es nicht ganz angeschaut. Habe aber auch keinen 4 takter mehr deswegen. Aber für andere ist es bestimmt sehr hilfreich.
Well Done. I most likely have the same problem. Could you recommend the address of the store where you bought these 85+90 screws ? I would like to take a closer look at them. Maybe I can find in a local store without shipping. Thanks mate. Regards from Poland
Mein Bremslicht geht nur an wenn ich die vordere Bremse ziehe. Wenn nur hinten Bremse nicht ist das normal? Vorne ist ja ein bremslichtschalter verbaut. Ist da für die hintere auch was verbaut? LG Michael
hello there from Vancouver Canada. someone has a scooter like this for sale. real cheap. doesn't run. I'm in the business of rebuilding engines. this scooter will be my first. I'm looking for other engine rebuild videos, but not finding much. it looks like you know where to get parts. hope to keep touch with you. have a great day
I had a scooter like this. They have trouble running when it’s hot. They can die when they overheat and don’t start until they cool down so keep that in mind. They love the cold and start everytime no choke. The factories put the wrong main jets in these (83 when it should be 75) so make sure to change that too. I did it and made a big difference in acceleration.
Harihariharibol newsubscriber lets c what u got best south africa i have zapp gy6 cleaned carburator new spark plug main jet size 107 im 5960 feet above sea level top speed 60km i spoke to a scooter mechanic here in south africa he says dont change the size of jet but cant tell me why i cant go faster than 60 km help
@@bikedogtor1663 You once wrote "I always wanted a Aprila RS, because its the most powerful 125 2 stroke", soooo what is the maximum speed and acceleration ;)
The max speed is up to the sprocket sizes of course. With 15 front and 39 rear mine goes 145km/h and acceleration feels incredible once the power valve opens 😄
I hope you are still around. I have been struggling with this bike for over a year now. It looks like the one in the video but is called Znen with QMB139 engine. I can get it over 30kph! I have replaced everything that I can replace. I haven't removed the bolt from the carb yet or increased the jets though.
Hi and what are you struggling with?
@@bikedogtor1663 I have the Znen QMB139. On the jackstand I can get full throttle RPM's but with a load the bike just seems to idle? Replaced CVT rollers 5.2g -->11g, replaced clutch, replace carb, replaced stator, plug, wires, fuel lines, vacuum hoses. On the road I get 30KPh (~19Mph). This is so frustrating. I have a #75 jet and have ordered larger sizes. The jet is the last thing I know to do before rebuild to 80cc. Any suggestions?
@@Dr_Tripper you need to take the speed limiter wire out of the cdi just unplug that and you should go alot faster
@@olafurmarel I have replaced it with a 'racing' cdi, is that the same thing?
@@Dr_Tripper you still have to unplug one wire from the cdi you can search on youtube
nice vid
So did you keep the screw out of the carburator or did you add it back??
Yes
Hi please where you change the the spark plug because I have a neco borsalino 50cc and I didn't find
I don't know on yours
Hello, I'll definitely try this, but did you consider big bore kit?
No big bore is too much work for this scooter and actually now it runs very well. Didn´t expect the 4 stroke 50cc to run nearly as well as my 2 stroke scooter.
@@bikedogtor1663 - For what it's worth keeping it closer to the initial design will always provide the best relation between performance/ reliability and of course COST! We're in a bit of ridiculous situation since all these engines where designed for more power and delivery. But nowadays due to restrictions are really tied up. Negatively affecting performance and regular usage! A pity! ;-)
What size main jet come this scooter with? I just bought a retro China scooter and I’m amazed by its torque and handling.
I don't know sry
Habe ich bei meinem Roller auch ausgebaut. Ist dann nur noch abgesoffen. Habs dann wieder eingebaut.
Ja weil du die Hauptdüse anpassen musst. Ist auch im Video zu sehen.
@@bikedogtor1663 ich gebe zu ich habe es nicht ganz angeschaut. Habe aber auch keinen 4 takter mehr deswegen. Aber für andere ist es bestimmt sehr hilfreich.
Klasse Video danke. Hast du einen link für die richtige hauptdüse? Danke
Danke, die Düse habe ich in irgendeinem Roller Shop gefunden. Weiß nicht mehr welcher.
Und wie schnell fährt er jetzt maximal? Und hat er eine offene cdi drin? Und hast du das Kabel vom Speedsensor getrennt?
Fährt ca. 50, offene cdi nehme ich an sonst würde er ja langsamer fahren.
Guude. Wo hast du denn diese 85er Schraube gekauft, bzw was ist das für eine?
Die habe ich irgendwo im Internet bestellt. Hatte einfach nach dem Modell gesucht
Baujahr? Hat der eine CDI oder schon eine ECU?
Beides keine Ahnung
Well Done.
I most likely have the same problem.
Could you recommend the address of the store where you bought these 85+90 screws ?
I would like to take a closer look at them. Maybe I can find in a local store without shipping.
Thanks mate.
Regards from Poland
Thanks. I do not remember the store sry
Mein Bremslicht geht nur an wenn ich die vordere Bremse ziehe. Wenn nur hinten Bremse nicht ist das normal? Vorne ist ja ein bremslichtschalter verbaut.
Ist da für die hintere auch was verbaut?
LG Michael
Die hintere bremse hat immer ein bremslicht. Da stimmt was nicht
@@bikedogtor1663
Danke hab es gefunden.
Der kleine Druckschalter der den Strom unterbricht oder halt durch fließen lässt ist kaputt.
LG Michael
Moin, weißt du zufällig noch, welche Größe deine Nebendüse hatte?
Leider nein
@@bikedogtor1663 Schade.
How tall you are, is this scooter good for 185 cm height?
I am 180 and it's okay
Ich kenne mich mit hauptdüse nivhz aus was für eine bräuchte ich den m5 85 oder m6 90 ?
Das ist zu lange her, ich weiß es nicht mehr
hello there from Vancouver Canada. someone has a scooter like this for sale. real cheap. doesn't run. I'm in the business of rebuilding engines. this scooter will be my first. I'm looking for other engine rebuild videos, but not finding much. it looks like you know where to get parts. hope to keep touch with you. have a great day
I had a scooter like this. They have trouble running when it’s hot. They can die when they overheat and don’t start until they cool down so keep that in mind. They love the cold and start everytime no choke. The factories put the wrong main jets in these (83 when it should be 75) so make sure to change that too. I did it and made a big difference in acceleration.
Kann ich auch eine 86 Hauptdüse benutzen?
Musst du ausprobieren. Bei mir hat eine nr größer ja alles ausgemacht.
Ist das ein 2takt oder 4takt
4 Takt
Wie kann ich meine Luxxon Cruiser schnell machen? Max ich kann 45 km/h fahren...
Drossel entfernen?
Wozu Titel & Beschreibung in Deutsch wenn de Englich sprichst?
UA-cam freut auch über Übersetzungen
*Denglish
50cc???
Yes
Harihariharibol newsubscriber lets c what u got best south africa i have zapp gy6 cleaned carburator new spark plug main jet size 107 im 5960 feet above sea level top speed 60km i spoke to a scooter mechanic here in south africa he says dont change the size of jet but cant tell me why i cant go faster than 60 km help
Main jet 107 seems really big to me. What is original?
Where Aprilia Rs xd
It was outside because it's my daily bike now ;-)
@@bikedogtor1663 You once wrote "I always wanted a Aprila RS, because its the most powerful 125 2 stroke", soooo what is the maximum speed and acceleration ;)
The max speed is up to the sprocket sizes of course. With 15 front and 39 rear mine goes 145km/h and acceleration feels incredible once the power valve opens 😄