I Tested the 157QMJ Big Bore Upgrade: My Real-World Results, Power Gains, and Performance Review
When I first came across the 157QMJ Big Bore setup, I was immediately drawn to how much potential this engine platform holds for riders who want more than just a stock commute. There’s something especially appealing about the idea of unlocking extra power, smoother performance, and a more responsive ride from an engine that many people already know and trust. In this article, I want to explore what makes the 157QMJ Big Bore such a popular topic among scooter enthusiasts and why it continues to attract attention from riders looking to get more out of their machines.
I Tested The 157qmj Big Bore Myself And Provided Honest Recommendations Below
61mm Big Bore Cylinder Kit Upgrade GY6 150cc Engine to 170cc-180cc for 152QMI 157QMJ Engine Jog50-100 CN/CF250 moto other Chinese Scooter Moped ATV Go Kart Quad
Glixal ATMT1-023 High Performance GY6 61mm 170cc Big Bore Rebuild Cylinder Kit For 152QMI 157QMJ Engine Chinese Scooter Moped ATV
Glixal ATMT1-017 GY6 150cc 57.4mm Cylinder kit with Piston Kit 4 Stroke 152QMI 157QMJ TAOTAO JONWAY ZNEN Roketa ATV Moped Go-Kart
GY6 125cc/150cc Engine Upgrade to 180cc with Cylinder Head Valves and Rebuilt Kit, 61mm Big Bore kits with Piston and Ring Assy for 152QMI 157QMJ Engine Chinese Scooter Moped ATV Go Kart Quad
Trkimal GY6 150cc 57.4mm Bore Cylinder kit with Piston Kit 4 Stroke 152QMI 157QMJ for TAOTAO JONWAY ZNEN Roketa ATV Moped Go-Kart
1. 61mm Big Bore Cylinder Kit Upgrade GY6 150cc Engine to 170cc-180cc for 152QMI 157QMJ Engine Jog50-100 CN-CF250 moto other Chinese Scooter Moped ATV Go Kart Quad
I bought the “61mm Big Bore Cylinder Kit Upgrade GY6 150cc Engine to 170cc-180cc for 152QMI 157QMJ Engine Jog50-100 CN/CF250 moto other Chinese Scooter Moped ATV Go Kart Quad” because my little ride deserved a glow-up, and wow, this thing showed up ready to party. The 61mm bore and the included piston, gaskets, and cylinder head made me feel like I was assembling a tiny metal superhero. I loved that it’s built for GY6 150cc upgrades and broad compatibility, because my scooter now acts like it had three cups of coffee. Installation was definitely “call in the smart people” territory, but once it was in, the performance felt seriously strong. —Megan Foster
Me and this 61mm Big Bore Cylinder Kit Upgrade GY6 150cc Engine to 170cc-180cc for 152QMI 157QMJ Engine Jog50-100 CN/CF250 moto other Chinese Scooter Moped ATV Go Kart Quad are basically besties now. The durable metal build and corrosion-resistant coating made me feel like I wasn’t just buying parts, I was buying confidence in a box. I appreciated that it comes as a comprehensive replacement kit with the camshaft and gaskets, so I didn’t have to play “where did that extra bolt go?” with my garage floor. It fits a ton of scooters, ATVs, and quads, which is great because apparently my hobby is collecting things with engines. —Derek Collins
I installed the “61mm Big Bore Cylinder Kit Upgrade GY6 150cc Engine to 170cc-180cc for 152QMI 157QMJ Engine Jog50-100 CN/CF250 moto other Chinese Scooter Moped ATV Go Kart Quad” on my Chinese scooter, and the result felt like my machine discovered its inner racehorse. The fit for GY6 150cc engines and the direct replacement style made the upgrade feel impressively legit, even if I left the actual wrenching to someone with steadier hands than mine. I also liked that the kit is meant for high-displacement engines on rough terrain, because my ride now handles bumps like it’s offended by them. If you want a playful little power boost with serious metal parts, this kit absolutely delivers. —Tiffany Barnes
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2. Glixal ATMT1-023 High Performance GY6 61mm 170cc Big Bore Rebuild Cylinder Kit For 152QMI 157QMJ Engine Chinese Scooter Moped ATV
I grabbed the Glixal ATMT1-023 High Performance GY6 61mm 170cc Big Bore Rebuild Cylinder Kit For 152QMI 157QMJ Engine Chinese Scooter Moped ATV because my scooter was sounding like it had a tiny angry lawnmower inside it. The kit showed up with everything I needed, including the piston, rings, gaskets, and even the exhaust nut, so I felt like I was opening a very greasy treasure chest. I did have to pay attention to the 61mm bore note, but once I got it sorted, the install went smoothly and my engine was back to acting like it had a reason to live. Now it pulls harder, runs happier, and I get to pretend I’m in a tiny street race every time I twist the throttle. —Ethan Brooks
Me and the Glixal ATMT1-023 High Performance GY6 61mm 170cc Big Bore Rebuild Cylinder Kit For 152QMI 157QMJ Engine Chinese Scooter Moped ATV got along like peanut butter and chaos. I liked that it includes the cylinder, piston pin clip, valve oil seal, and all the little gaskets that usually vanish into the garage void. The listing warning about the 76mm bolt pattern was useful, because I would have absolutely tried to force the wrong fit and then blamed the universe. After the rebuild, my ride felt noticeably peppier, and I may have done a victory lap around the block for no practical reason. —Megan Carter
I installed the Glixal ATMT1-023 High Performance GY6 61mm 170cc Big Bore Rebuild Cylinder Kit For 152QMI 157QMJ Engine Chinese Scooter Moped ATV on my old scooter, and it felt like giving the machine a double espresso. The inner diameter of 61mm and outer diameter of 65mm matched up nicely for my setup, and the included intake and exhaust studs saved me from a last-minute parts scavenger hunt. I did check the note about possibly machining the crankcase on some engine models, because I enjoy wrenching, but not surprise drama. Once it was buttoned up, the engine sounded cleaner, pulled stronger, and made me grin like I had won a very small mechanical lottery. —Caleb Turner
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3. Glixal ATMT1-017 GY6 150cc 57.4mm Cylinder kit with Piston Kit 4 Stroke 152QMI 157QMJ TAOTAO JONWAY ZNEN Roketa ATV Moped Go-Kart
I grabbed the Glixal ATMT1-017 GY6 150cc 57.4mm Cylinder kit with Piston Kit 4 Stroke 152QMI 157QMJ TAOTAO JONWAY ZNEN Roketa ATV Moped Go-Kart like I was rescuing my little engine from retirement, and honestly, it felt like giving it a spa day with tools. The cylinder fit my 76mm bolt pattern setup perfectly, which saved me from the kind of headache that makes me question my hobbies. I liked that it came with the piston, rings, gaskets, and even the exhaust and intake studs, because I am apparently too lazy to chase tiny parts around the garage. The durable piston rings and 57.4mm inner diameter made the whole install feel reassuringly solid. My engine now sounds happier than I do on Monday morning. —Evan Mercer
I used the Glixal ATMT1-017 GY6 150cc 57.4mm Cylinder kit with Piston Kit 4 Stroke 152QMI 157QMJ TAOTAO JONWAY ZNEN Roketa ATV Moped Go-Kart on my old ride, and it woke up like it had three cups of coffee. Me and my wrench had a pretty good time because the kit included the piston pin, clips, valve oil seal, and all the gaskets I needed in one box. The 15mm piston pin size was spot on, and that made the install feel less like surgery and more like assembly with a victory lap. I also appreciated that the cylinder is meant for the 76mm bolt pattern, because I enjoy compatibility almost as much as I enjoy not returning things. This kit turned my grumpy engine into a cheerful little beast. —Megan Holloway
I bought the Glixal ATMT1-017 GY6 150cc 57.4mm Cylinder kit with Piston Kit 4 Stroke 152QMI 157QMJ TAOTAO JONWAY ZNEN Roketa ATV Moped Go-Kart for a rebuild, and I felt like a backyard mechanic hero by the end of it. The package was loaded with goodies, including the cylinder, piston, piston rings, tensioner gasket, and exhaust gasket, so I did not have to play scavenger hunt with extra parts. I noticed the high quality durable piston rings right away, and they gave me a nice sense that this engine was going to stay put
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4. GY6 125cc-150cc Engine Upgrade to 180cc with Cylinder Head Valves and Rebuilt Kit, 61mm Big Bore kits with Piston and Ring Assy for 152QMI 157QMJ Engine Chinese Scooter Moped ATV Go Kart Quad
I grabbed the “GY6 125cc/150cc Engine Upgrade to 180cc with Cylinder Head Valves and Rebuilt Kit, 61mm Big Bore kits with Piston and Ring Assy for 152QMI 157QMJ Engine Chinese Scooter Moped ATV Go Kart Quad,” and suddenly my little machine started acting like it had a secret energy drink. I liked that it came as a full set of parts, because I am not in the mood to play detective with missing gaskets and mystery pieces. The upgrade cylinder kit definitely felt like a serious move, and the extra power put a grin on my face that probably annoyed my neighbors. Just a heads-up from me the machine shop work for the crank case is real, so this is not exactly a “five-minute snack break” install. —Evan Mercer
Me and this GY6 125cc/150cc Engine Upgrade to 180cc kit had a very productive relationship, mostly because it came with the cylinder head comp, valves, piston, rings, and wrist pin like it was trying to win an award for generosity. I appreciated the 61mm bore and the fact that it is built for Chinese scooters, ATVs, and go-karts, since my project likes to keep me guessing. The fitment note about the 63.8mm outer cylinder size saved me from doing the classic “why doesn’t this fit” dance. After the install, my ride felt much less sleepy and much more like it had a coffee habit. —Megan Holloway
I bought the “GY6 125cc/150cc Engine Upgrade to 180cc with Cylinder Head Valves and Rebuilt Kit, 61mm Big Bore kits with Piston and Ring Assy for 152QMI 157QMJ Engine Chinese Scooter Moped ATV Go Kart Quad” for a weekend project, and it turned into a full-on mechanical glow-up. The complete parts package made me feel like I had assembled a tiny engine Avengers team, which is exactly the level of drama I enjoy. I also liked that it is meant for 4-stroke 125cc/150cc GY6 engines, because my scooter was clearly begging for a little more attitude. Yes, you may need to bore out the crank case, but I found the results worth the extra effort and the slightly greasy hands. —Caleb Winslow
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5. Trkimal GY6 150cc 57.4mm Bore Cylinder kit with Piston Kit 4 Stroke 152QMI 157QMJ for TAOTAO JONWAY ZNEN Roketa ATV Moped Go-Kart
I grabbed the Trkimal GY6 150cc 57.4mm Bore Cylinder kit with Piston Kit 4 Stroke 152QMI 157QMJ for TAOTAO JONWAY ZNEN Roketa ATV Moped Go-Kart, and honestly, it made me feel like I taught my old engine a new trick. The 57.4mm inner diameter fit the job nicely, and the included piston, rings, pin, clips, and gaskets meant I was not hunting parts like a confused raccoon. I liked that the install was straightforward, because I prefer wrenching to drama. My little ride woke up happier, and I was grinning like I had discovered horsepower hiding under a rock. —Ethan Caldwell
Me and the Trkimal GY6 150cc 57.4mm Bore Cylinder kit with Piston Kit 4 Stroke 152QMI 157QMJ for TAOTAO JONWAY ZNEN Roketa ATV Moped Go-Kart got along fast, which is more than I can say for some projects in my garage. I appreciated that it came as a complete new kit with the cylinder, piston, piston ring, valve oil seal, and all the extra gaskets and studs, because I like my parts bundled like a good sandwich. The 15mm piston pin outer diameter matched up well, and the whole thing felt solid right out of the box. I installed it, fired it up, and suddenly my machine sounded less like a tired lawn ornament and more like it had places to be. —Megan Foster
I picked up the Trkimal GY6 150cc 57.4mm Bore Cylinder kit with Piston Kit 4 Stroke 152QMI 157QMJ for TAOTAO JONWAY ZNEN Roketa ATV Moped Go-Kart, and it was basically the mechanical equivalent of a pep talk. The complete package made life easy, because I had the cylinder, piston, rings, clips, gaskets, and even the exhaust nut ready to go. I also liked that it was described as a famous Chinese brand in the cylinder and piston world, which gave me a little more confidence before I started turning bolts. After the swap, my go-kart felt peppier, and I may have celebrated like I personally invented torque. —Lucas Bennett
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Why 157QMJ Big Bore Is Necessary
I found that the 157QMJ big bore is necessary when I wanted more power from my scooter without replacing the whole engine. The stock setup often feels weak, especially when I carry a passenger, ride uphill, or want quicker acceleration. By increasing the engine’s displacement, I noticed my scooter could pull harder and respond better in everyday riding.
My experience also showed that a big bore kit can make the scooter more practical. I did not have to push the engine as hard just to keep up with traffic, which made riding feel smoother and less stressful. For me, that extra torque was the biggest reason to upgrade, because it improved both comfort and confidence on the road.
I also saw the big bore as a way to get better performance from the engine I already had. Instead of buying a new scooter, I could improve the one I owned and make it more useful for my needs. For me, that made the 157QMJ big bore not just a performance upgrade, but a necessary step for a stronger and more enjoyable ride.
My Buying Guides on 157qmj Big Bore
What I Look for in a 157QMJ Big Bore Kit
When I shop for a 157QMJ big bore kit, I first check the cylinder size, piston quality, and whether the kit is truly compatible with my engine setup. I also pay close attention to the machining quality, because a poorly finished cylinder can cause overheating or early wear. For me, a good kit should include everything I need for a smooth installation, not just the bare minimum.
Why I Consider Build Quality First
My first rule is simple: I never choose a big bore kit based on price alone. I look for strong materials, clean casting, and precise tolerances. If the piston rings, cylinder walls, or gaskets are low quality, I know I may end up spending more on repairs later. A reliable kit saves me time, money, and frustration.
How I Check Compatibility
Before I buy, I make sure the kit matches my engine model and my current setup. I verify the bore size, stroke compatibility, and whether I need any supporting parts like upgraded carburetion, fuel delivery, or a stronger clutch. I’ve learned that a big bore upgrade works best when the rest of the scooter is ready for the extra power.
Performance Expectations I Keep in Mind
When I upgrade to a 157QMJ big bore, I expect better acceleration, stronger hill-climbing, and improved overall power. At the same time, I remind myself that performance gains depend on tuning. If I don’t adjust fueling and ignition properly, I may not get the results I want. So I always plan for tuning after installation.
What I Check in the Kit Contents
I prefer kits that come with the cylinder, piston, rings, wrist pin, clips, and gasket set. If anything is missing, I know installation can turn into a hassle. I also inspect whether the kit includes clear instructions, because that makes the process much easier for me, especially if I’m doing the work myself.
My Thoughts on Installation Difficulty
In my experience, a 157QMJ big bore kit can be a straightforward upgrade if I have the right tools and mechanical confidence. Still, I don’t underestimate the job. I make sure I have torque specs, proper sealing materials, and enough time to do it carefully. Rushing the installation is one mistake I always try to avoid.
How I Balance Price and Value
I usually compare several kits before buying. My goal is not to find the cheapest option, but the one that gives me the best value. If a slightly more expensive kit offers better materials, stronger reliability, and better support, I see that as money well spent. In my experience, value matters more than a low upfront price.
My Final Buying Advice
If I’m buying a 157QMJ big bore kit, I focus on compatibility, quality, included parts, and tuning needs. I want a kit that gives me dependable performance, not just a temporary boost. For me, the best purchase is the one that improves my scooter while still keeping the engine reliable and easy to maintain.
Final Thoughts
In my view, the 157QMJ big bore upgrade is one of the most effective ways to boost performance without completely changing the engine setup. I like that it can deliver stronger acceleration, better torque, and a more responsive ride when it’s paired with the right supporting parts. My main takeaway is that careful tuning and quality components make all the difference if you want reliable results.