139QMB Gearbox Bearing Replacement Part 1 (GY6 50cc Scooter)

Part 1 (of 2) showing the replacement of the gearbox, aka final drive transmission, bearings in a 139QMB / GY6 50cc scooter. Part one covers disassembly and removal of the bearings. Part 2 covers installation and reassembly.

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Part 2 :

The scooter is a 2013 TaoTao ATM50-A1.

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#139QMBRepair #ScooterFix #49ccScoot

[frost]

When he freeze frames and provides the mm's of the bearings and the bearing Part Numbers, it's spot on. I've searched and found all the bearings I needed to complete my crank case bearing replacement project with his information; and the steps provided. Great video for this crank case bearing job. I'm working on a TaoTao 50cc QMB139.

[Namikaze]

Thanks a lot. You saved me. Hi from Romania.

[Patty-Ann-Dunn]

thank you for making this video. i today i just got done ordering all NSK bearings for my taotao 49cc. i also ordered the honda part number bearing as well. i am having all my bearings be NSK. i am doing a total engine upgrade. bye bye chinese parts and hello high quality parts. i also ordered new gasket and seals. again thank you for doing this video.

[-ur]

Perfect video !! Precisely what i was looking for bravo 👏

[lucaspeltie]

If you don't want to invest in a slide hammer, there's tricks to force the bearings out using hydraulic power with grease, bread or wet paper towels. I used wet toilet paper. The smaller bearings were tough, but the larger one came out like butter.

[binadybudhi]

Thanks for the tutorial. It's beneficial!

[Meinstantics]

90, your 2 videos on this are so concise and clear, thanks so much for putting these up. I have a problem with the primary driveshaft on my FIDDLE 1 50 2T AC 03-08 FA05U scooter. It has significant play / movement and it is vibrating the clutch and rear pully above 20 kmph to the point that it is not rideable. It seems like a daunting task, but i'd like to have a crack at switching the bearing and seals myself. Is it possible to show you a clip and a few pics of what is going on? It's really hard to find good advice on this without paying a mechanic a small fortune.

[Manwichman]

What size countershaft spacer does it use? I can't find one specifically for it anywhere. Thanks

[andrewflath]

What would cause the flywheel to not come off. It rotates freely but the thread on both the flywheel and extractor tool were stripped and the flywheel is still on.

[michaeldevitt]

What is the round peg next to drain plug mine is just a hole and oil leaks out is it a breather thanks Mike

[wadebarnes]

On a 150cc what's the best gears to put in the transmission to keep from redlining all the time

[Maibu-OReiley]

i just had to replace my gearbox on my 150cc, basically the same, but larger, somehow with a good gasket, water got in and all the gear oil leaked out, as a result, all the gears were rusted out and caused my bearings to explode, glad i had an extra bad 150 motor with a excellent gear box laying about...

[davidkoontz]

I bought a bearing puller just for this job those bearing don’t budge!!!wtf? Any help? Or ideas? How about heat?

[KESEDTUBE]

Nice video, I will use these steps to swap transmission final output drive shaft.
The shaft with my engine is too long.

[pilyomotoride]

Hi would this be similar process for pcx 150

[sextonism]

Can you please tell me what that is please

[DaCptnBobHawaii]

Is there a 139qmb performance bearing kit?

[glzboy]

The odd size bearing I have found 6303x3-2 says it's a 2 sided sealed bearing with grease inside. Can I use this as it is or do I need to remove both seals to make it an open bearing. Thanks

[michaelreffett]

I use 80-90w gear oil with just a shot of lucas oil stabilizer, is this ok? I also use lucas oil stabilizer when I do an oil change 29% lucas and 80% senthetic 10w30, is ok?

[KXSWORKS]

Is the gearset cross compatible with the 125cc version?