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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Availability:
In Stock.
Arrives
Thursday, Aug 6
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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, Aug 6
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
So for starters my moped had low compression because my piston rings where bad so I got this kit and when I got it everything seems pretty good but one of the problems was the piston rings that came with the piston in this kit where completely flush with the piston and they are not supposed to be flush so I wasn't getting any compression so I ordered a piston kit from trkimal theirs was correct so I tossed it all together and after a couple minutes of riding my moped I lost all power so I looked into it and found that the rocker arms that came with it broke so if your rocker arms are bad I would just buy a different pair but overall this kit isn't too bad I used to only be able to go 30 miles a hour on my znen wolf rx50 now I can reach a little over 45 miles a hour and the acceleration is so much faster also if you don't know the torgue specs for the rocker arms it should be 14 ft-lbs and I set my rocker arm gaps to 00.3mm intake and 00.4 exhaust
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Reviewed in the United States on August 23, 2023 by Josiah
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
Awesome. Ive been using this kit for over a month now and its powerful. That being said i keep my rpms below 8k just because I dont trust the valve springs. I'll be upgrading the springs to better ones just in case. Ive bought 2 of these so far and am likely to get another for my spare scooter
Reviewed in the United States on February 6, 2026 by Daniel
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
I thought I was unboxing a Rolex. This was phenomenally Pact. This is the best kit I purchased off of Amazon hands-down have not installed it yet. Will install and leave review along with the install packaging and everything was beautiful. This is almost the first time I’ve ever received a package with all of the steals completely intact, not bent.
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Reviewed in the United States on October 19, 2025 by donna
Great Bang for the Buck!! The upgrade lasted around a month or so and the Exhaust valve snapped, putting a hole through the piston and full rebuild. Just wanted to give a shout out to the Glixa team. Great work a little extra material on the molding but no complaints except PLEASE PLEASE upgrade the Valves. I was heartbroken after all the work and sweat........
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Reviewed in the United States on December 21, 2025 by SlI see see see see see see see"
Well my head was not finished had to grind down my intake side of head. To open up the hole. And the orange cdi, and coil. Are junk, tried it out on my daily driver wouldn't start. Replaced my coil bike started but ran really rough. Then put ordinal back on bike was fine. So the orange coil and cdi bad.
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Reviewed in the United States on August 19, 2025 by French fried