Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit with Performance Big Valve Cylinder Head Assy for 139QMB 139QMA 147QMD Engine Scooter Moped ATV Go-Kart (69mm-18.5/20.5mm Larger Valves)
Condition: New
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30-day refund/replacement
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Availability:
In Stock.
Arrives
Thursday, Sep 4
Features
- Use Large Valve Heads to Get More Power for Your GY6 139QMB 139QMA 147QMD Scooter ATV Go Kart Engine!!
- This Big Bore Rebuild Kit Comes with 18.5/20.5mm Large Valve Cylinder Head Assy (Stock is 16/18.5mm).
- Compatible with 69mm Long Valve Style Heads. If your Original Head Has 64mm Valves, Please Must Change Your Rocker Arms with The Ones in Our Kit.
- Glixal Piston Rings: DLC Wear Resistant Coating. This Coating will Also Reduce the Friction Coefficient to Protect the Cylinder Sleeve.
- Please Note: The Engine Side Cover Gasket is for a Short Case Version (8 Bolt).
- Attention: AT marking face to the piston, the 6mm small hole goes up or away from the Motor !!!
Manufacturer: Glixal
Brand: Glixal
Item Weight: 8.34 pounds
Package Dimensions: 16.5 x 12.05 x 4.09 inches
Item model number: ATMT1-010ML69
Manufacturer Part Number: ATMT1-010ML69
Date First Available: July 1, 2023
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Sep 4
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
I'm editing my review, since I just had to teardown my engine today. The exhaust valve spring broke. So I am gonna replace the springs this weekend. Luckily nothing else was damaged. Other than that the kit has been good. The cdi box was junk (good luck finding a decent cdi box for a 50cc) and the exhaust studs are junk. So if I was doing this again, I would get better studs for the exhaust and try to get higher quality valve springs. This kit is such a great deal. Before this kit my scooter had a top speed of 38mph and going up hills it would drop down to 10mph sometimes. I put this kit on and the acceleration is awesome. I have no problem keeping up with with traffic now and even steep hills I can cruise over 30mph. I'm waiting to break in the motor before I really find my top speed, but I've had it up to 45mph, GPS verified so far. The new ignition system, variator weights, and clutch springs are a great bonus. Installation is easy enough. I left the engine on the bike. You'll need a socket set with 8-10mm shallow and deep sockets, feeler gauges, torque wrench something to clean any old gasket material and screwdrivers and wrenches. A hobby mechanic should be able to complete this install in under 5 hours. Other upgrades I have done so far are a new carb with 85 main jet, free flowing air filter new variator and weights and black performance exhaust. I got a new 2000rpm clutch but I haven't installed it yet. All ordered off Amazon! A final note. This kit will make your 49-50cc sooter 82cc not 100cc. But those 32cc will feel like 100 for sure.
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Reviewed in the United States on May 23, 2024 by Thomas DePaolo
Everything feels to be Good quality, and went together smoothly. My friends all have this kit and have put several 1000s of mile on thiers. Anyone saying that a rocker arm broke or something to that effect didn't install the arms in the kit... or the oil pump both come because they are nessasary and are slightly different for oem. Now I did decide to install a new 20mm carb from the same seller and landed on a 88 main jet for it (sold separately) I haven't installed the yellow tourqe springs yet (new clutch coming) but I've already installed the sliders in the varator right now I'm reaching just shy of 50 mph on gps with room for improvement. It's definitely got the extra power to go ahead with a gear up kit. now it will climb hills while accelerating no problem and maintains speed on giant hills. (It also pops wheelies) Now for the down side the red Cdi box was defective after some back and forth massaging the seller directly we decided on a 10$ refund. which is much better than the alternative of tearing it back down to do an exchange. That being said between my brothers and my buddies 15 people in all I'm the only one who's had any defective parts from this kit so it's safe to say it's a freak one off incident. Plus for the price of the kit 10$ is more than reasonable when you add up the value of Everything it also give me the excuse to go deeper down the rabbit hole of performance mods lol time for an adjustable CDI
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Reviewed in the United States on July 4, 2024 by Jake
I love the kit, but I received an A9 cam that was pressed on out of time causing my exhaust valve to hit my piston at 180° out. I lined it up with another cam that I got out of another kit and I can visibly see that it's off time. That particular kit also gave me a 69mm valve head and 64mm valve rocker arms.
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Reviewed in the United States on July 12, 2025 by Michael Lodes Michael Lodes
Everything worked but the cam it was knocking like it was the valves and it wasn't the valves it was the cam put my factory cam in the kit and no knocking
Reviewed in the United States on May 11, 2025 by Zachary Presley
Great kit. Made my 50cc scooter much more capable when it came to keeping up with traffic and climbing hills. Gives a very noticable boost in power, especially off-the-line torque. Everything is high quality and very well manufactured, but that doesn't mean anything if you don't do your research and take your time with the installation. When handling such small parts, it can be relatively easy to make a costly mistake. Everything bolts right on, and fits together as it should with no modification necessary. I've put over a thousand miles on mine and had no issues outside of those caused by my own inexperience and abuse hahaha. Couldn't be happier with my purchase!!!
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Reviewed in the United States on December 11, 2024 by Patrick B.
great kit. i have used this kit several times on several engines. parts are good quality, gaskets fit great. i really have no complaints with this kit at all.
Reviewed in the United States on April 14, 2025 by ashton
Worked for about 300 miles then would no longer start due to the intake valve having a flat spot & leaking fuel into the piston jug making the whole kit useless, wasted a lot of my time, & some of my money. Riding season is almost over & I have a scooter that is broken.
Reviewed in the United States on August 2, 2025 by Samantha Botz
Fantastic job glixal on this big bore kit ! 89 bucks is unbelievable for how well built this kit is . Great job ! Please keep making great and durable products
Reviewed in the United States on May 9, 2024 by Amazon Customer Amazon Customer