GY6 [EVERYTHING YOU NEED TO KNOW] decode your engine!

FOR PARTS:

Belt video:

If you are confused what engine you have in your machine, this video should help.

QMB139 = 50cc air cooled 39mm piston (made in China) 52mm is the max big bore kit size

QMI152 = 125cc air cooled 52mm piston (made in China with 54MM stud spacing or made in Taiwan 57mm stud spacing) 64mm max case bore size (A motor) 70mm max case bore size (B motor)

QMJ157 = 150cc air cooled 57mm piston size (made in China with 54MM stud spacing or made in Taiwan 57mm stud spacing) 64mm max case bore size (A motor) 70mm max case bore size (B motor)

[MarkArrand-cfcl]

I have worked on MANY a Japanese bike. Even worked on an 883 Sportster. I have NEVER worked on a Chinese motor-anything until recently. I would be chasing my tail were it not for videos like this one. I have learned a lot about the gy6 in a VERY short time. Thank you for your video.

[robertmotion]

ebike mechanic here.
expanding business.
repairing Chinese scooters now.
ur channel is in my rotation of video resources when i need help.

thanks + new subscriber.

/Bklyn👑

[christianschrull]

I came to see if you would "decode" how to determine short and long case and I love that it's the first thing you talk about and make it super easy to understand. Everyone else speaks jibberish. Now I can order a new engine with peace of mind. Thanks, brother.

[Shakey]

Thanks you! Amazon just sent me the wrong motor. Thanks to you I didn’t get into my motor replacement and find out. Your the man!

[KeifusMathews]

Thanks for sending me this video " Rolling Wrench" now I can rest easy when ordering parts from you, THANKS AGAIN!!!
I have the 50cc QMB

[connect]

I just got a malaguti Ciak 150cc and I believe it has a GY6 long case motor. It currently doesn’t run but is in great shape! Looking forward to pulling this thing apart and getting it on the road!

[USMC-Sniper-]

I was doing 20 miles an hour in reverse in my Scoot Coupe down hill when I did a double summersault combination half pike into a quad rolling back flip when I hit the subscribe button before successfully landing on all 3's

[mattlanthier]

I'm so glad I just came back to this video I just picked up a engine today for 100bucks. I completely forgot about the stud spacing and almost just spent some money on stuff that may not fit.

[keithkunik]

Hey bro!! I bought my ruckus from a guy on Facebook and I’m the pics the bike was sweet!! But when I got there his hands were covered in grease and a lot of the parts in the pic weren’t there! But for the price I was paying I got a beautiful 171cc big bore gy6 150 cc bike which I am a little leery about because upon watching your video I put it on pause and went outside and the number your talking about was grinded off the bike!! So I called my buddy and told him to come by tomorrow so we can rip this bike apart and check it! So now because I know the stud spacing I will know exactly what I’m looking at!! Thank you brother!! Great videos love your energy!!

[djgreyman]

Thanks for the great info! not just this, but all your vids. Sooo happy I found your channel.

[nonyahbiznezz]

I have been wanting to build myself a fun get around custom project for a while now. My 50cc 2 stroke skateboard is fun but not practical for distance.Now i have a gy6 50cc ugly funky scooter and im going to rip it apart and use the power plant (motor & CVT transmission) and front disc brake set up and modify a beach cruiser bicycle to fit the GY^ engine with all the goodies like water cooled 100cc big bore kit, stroker counterweighted crank, ported and polished cyl. head, turbo kit lower gearing and add all this to 26 inch heavy duty spoked bicycle wheels for an over all top speed around 70 mph! I will be fit to really get around easily during 5pm traffic jams!

[robertbell]

I have learned so much about mopeds and now that I know so much I work on my moped myself and I just replaced my clutch today

[derrickburton]

Yooo Homie, you are amazing with this stuff Dude!!! I really wanna learn more about my bike... I hate to sound stupid, but my bike is the 250cc Venom X22 GT and I wanna know my options to upgrading. Not sure how to contact you, but if you can, please contact me! 🙏

[bobcormier]

Your the best man .. I just got a scooter 50.cc. I like how you exsplane the hole thing .thks

[rankontop]

Can you do a video on what hoses to hook up and which ones don't. Mainly talking about emissions and what not.
I'm glad to know the basics. Thank you.

[EZ]

This is what I'm looking for. Very thankful 😊

[mpanka]

One search, “how to know if I have a GY6?” And BAM!?!
much info packed into a 5min video!!
I JUST picked up a Chinese Back/half, I knew little to nothing... just knew I wanted faster! (Who doesn’t?! lol)
I’m a Fabricator/Creator/builder, so making the 139QMB fit on an old school Spree frame is going to be a snap, but for what little I have invested ($150 for a turnkey Spree-learned it needs a stator I can’t get new, and the gamble on a used one for $100 just not worth it when 4/st parts are SO cheap! Plus the running/complete GY6 QMB back/half) I’m that guy that has to squeeze unrealistic numbers from a seemingly “timid” looking 80’s Honda Spree....
In short, I can’t Thank you enough for answering every question I had and saving me hours of searching!!

[MPHI]

Great Video. My 50cc Scooter had a 137QMB 12" Engine. The valve cover has two caps for valve adjustment.

[chasebrunner]

Thank You So Much Just Found Out My 2005 Schwinn Laguna Has A QMB 50cc First Time To Even Know This

[wackingjack]

Thanks for decoding those numbers and letter