139QMB 50cc Performance
QMB139 50cc 4T OEM 139QMB -50cc Stock Parts 4T Also known as the GY6 50cc. It also goes by several other names such as 50QTB. This Chinese 49/50cc engine is used on many of the 4-stroke imported scooters including the new KYMCO 4 stroke units. Some common brands and names being imported are: Shanghai Shenke, EVO 50cc, Zongshen Metro 50cc, Baja Powersports (PEP BOYS made by Zongshen) Baja SC50, Strada RX 50 (4 stroke) Powersports Factory, Jalon JL50QT-21, Falcon and JL50QT-15, JL50QT-16 , Pantera Freedom, Fusion and Retro, Verucci VC50TS-3M, Sunl SL50QT-16, SL50QT-16, SL50QT-18, SL50QT-2, SL50QT-3, Roketa Bahama, Maui, Sicily, Tank, Baotian 50QT-9, Baotian, 50QT-11, Dotera 50QT-11, Jalon JL50QT-18, Sinski XSJ50QT-6, Sinski XSJ50QT-B, Taishan Commuter, Baja motorsports SC-50 sun city, primo, Taishan Sport Zhong Hu 50cc 4t This kit will fit most 4 stoke 50cc horizontal style (139QMB) Scooter, Moped, ATV 4-stroke air-cooled engines / motors that are being made and imported from Asia, China, Taiwan, Japan, Korea, etc. like kymco agility , baotian This kit will fit : BAOTIAN BT49QT-2 BAOTIAN BT49QT-7 BAOTIAN BT49QT-9 BAOTIAN BT50QT-9 BAOTIAN BT50QT-11 BAOTIAN Ecobike BENZHOU YY50QT BENZHOU City Star 50 BUFFALO Wind ERING Sprint 50 JIN LUN JL50QT KARCHER KM 50 Kreidler Flory 50 Kymco Agility 50 Kymco Agility MMC 50 Kymco Filly 50 Kymco Vitality 50 KYMCO Filly KYMCO Nexxon 50 KYMCO People KYMCO Super 8 KYMCO Vivality KYMCO NEW DINK 50 KYMCO Yager KYMCO Yager GT MSK Ecobike 50 PEUGEOT V-CLick REX Capriolo 50 REX Flory REX RS 450 REX RS 500 REX Off Limit 45 RIEJU Paseo 50 RIEJU Toreo 50 Sachs 49er 50 Sachs Bee SANILI TS50QT-4 QUINGQI QM50QT-6A XINLING ZHONG YU 50 QT-5 ZHONG YU 50 QT-7 ZHONG YU ZY 50QT ZHONGSHEN Wind 25/50 ZHONGSHEN ZS50QT-4 50, Fly Scooters, VIP, Peace, Roketa, United Motors, TGB, TNG, Benelli, PGO, Tomos Nitro, Kymco, and many more..... this list is continually growing.
| Performance Big Valve cylinder head assembly |
 Unbelievable performance gain not found anywhere. Don't be fooled by other so called "performance" heads. These are the real deal, fully modified in the USA by our professional technicians in house! Original valves in standard heads are only 15mm exhaust, and 18mm intake. These now have 17mm exhausts, and 22mm intakes, matched and hand ported with 3 angle valve seats. We have two options available: Complete assembled heads as shown in the picture here. Option two is with a matched big throat manifold and whopping 24mm carburetor, all matched and ready for 50-60mph scooter fun! We'd recommend using our 47mm big bore kit for a nice match and full potential. Also, be sure and measure the valve to piston clearance as these valves are much larger than original, if you don't, you could bend the valve. $124.95 and $149.95. Can't get even a port job done for that little! |
| Performance roller polygon sliders 16x13 |
These are probably the best bang for the buck if your still using those old round rollers in your variator. These will spread the load pressure to help broaden the range of variations as sticking is greatly reduced. So in the end, you will get the performance of a lighter and heavier weight roller, in one package, and last longer to boot. Just as good as Dr. Pulley, but much better price. $19.95 These come in 4g, 5g, and 6g now. Lighter weight give you more engine revs.
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| Performance variator roller set 16x13 |
Here you go, it's time to get those old rollers replaced, or you've done some modifications and want to get your scoot in tune. Rollers are the way you set the engine speed. Lighter weight raise engine speed, heavier weights lower engine speed. Be careful, higher is not always better as you can rev right past your torque curve and just spin out without any thrust. Too heavy a weight and you will be below your torque curve. These are quality copper fine finish rollers that are far superior to original. These come in 4g-7g. Quality at wholesale pricing. Only $9.95
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| High performance variator |
 Best variator on the market right now for your 50cc fourstroke chinese 139qmb and Honda DIO. This has a larger 79mm drive face (larger than stock), steeper roller ramps, extended glide rails for more travel, and slider rollers already installed, along with performance glide bushings and coated ramp plate. Need we say anymore? $69.95 These come in 4, 5, and 6g sliders. Lighter weight gives you more engine revs. |
| Bando Performance drive belt |
This is the nearly indestructable Bando brand 669-18-30 for all you guys who keep on breaking belts. These are Aramid cord (like kevlar) for high mileage and reliable use. $29.95
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| 729 Bando Performance belt |
 Aramid corded performance belt for the long case 139qmb engines that have the 12" and larger wheels. These are guaranteed not to break, and give better performance. $34.95 |
| Performance exhaust system |
Here is a quality affordable performance exhaust system for your 50cc and larger 139qmb scooter moped. This will give you some more bite and flash that is badly needed. Golden alloy anodized finish on the muffler, and chrome finish on the head pipe. Lowest anywhere at only $114.95 back in stock!
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| GY6-50 Stainless performance exhaust system. |
 Looking for a nice exhaust system that performs well too? Glass pack stainless system gives you the top end power and custom sound you want. Comes complete with headpipe and mounting hardware. Fits Chinese four stroke 139qmb 1P39qmb scooters and mopeds. $119.95 |
| 44mm top end kit |
Wonders of all wonders. ScrappyDogs now has a complete top end rebuild kit for those VIP, Peace, and other brands that use the 44mm piston instead of the normal 39mm. This can also be used as an affordable 60cc big bore kit (one size down from the 47mm, 72cc kit) affordable, good quality, and in stock! $59.95. Kit includes cylinder, piston, rings, circlips, gaskets, wrist pin as shown.
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| 80CC BIG BORE KIT |
This kit includes everything you need to upgrade your 50cc 4stroke to 72cc. Many places commonly call this an 80cc kit. Bore diameter is 47mm. This is over a 60% increase in engine size. Expect overall engine performance to improve almost as much. Great deal. Fits most GY6 scooter ATV 139qmb ( QMB139 ) engines. Check your engine number on your case. Works great with your stock head, and bolts right up with no modifications. Super deal, no one is lower than this! $69.95
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| 20mm Big Bore performance carburetor |
 Just put in a big bore, cam, exhaust, or just want a little more performance out of your scoot? This 20mm quality CVK will give you the top end power and speed you need at a price less than the other guy's cheapo standard carb. Save money and get more performance, what more could you ask for? $59.95 |
| 100cc Big Bore kit |
 Everything you need to bump your 139qmb engine up to a whopping 83cc. Many places commonly call this a 100cc kit. The bore diameter is a full 50mm, the largest you can go! Get the advantage on everyone else and surpirse the 150's when you keep up with them now. Warning: you may have to register this as a motorcycle now. Comes complete with cylinder, piston, rings, wrist pin, circlips, and gaskets. These are priced lower than anyone elses 80cc kits, and some 60cc kits as well. $89.95 |
| 23mm CVK Big Bore performance carburetor |
 High quality CVK performance carburetor that is not only better, but bigger! The venturi on this thing is a whopping 23mm! 5-7mm larger than your stock 139qmb engine. This will still fit into your stock manifold. Got a big bore? Performance cam? Take full advantage of it by putting this CVK pumper carb on it. Comes complete with accelerator pump and dependable electric choke. This is priced about the same as the other guy's standard cheapo carbs! $79.95 |
| Big bore head |
These are big bore heads for any 47 and 50mm big bore cylinder kits. Good quality casting is machined to fit the larger combustion chambers. $54.95
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| 52MM Big bore kit |
Biggest of the big! 52mm big bore kit will give you an actual 85++cc's of torque and power. Guaranteed to make a substantial difference. If you were impressed with our 47mm and 50mm kits, you will be amazed by our 52mm Taiwanese made kits here. These are NOT mundane mainland chinese built. Built to last, and packaged well. Kit comes with cylinder, piston, rings, wrist pin, gaskets and clips. No case modification is necessary for standard cases. This is not for the amateur installer. Compression should not exceed 220psi after break in. This is for the serious avid scooter/atv engine enthusiast only. How do we sell at these ridiculously low prices!? $99.95
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PERFORMANCE CDI
Scrap that limited stock CDI and drop in this unlimited performance CDI with no governer, and an advanced spark timing. This will increase acceleration and top speed by 5-10%, if all else is well. No guarantees on performance parts as this will not improve power if your engine is not running well to begin with. This is plug and play for GY6 scooter atv 50, 125, 150 engines in 152QMI, 152QMJ, 157QMI, 157QMJ, 139QMB 4strokes. If you have this connector and have an AC fired system, it work. See Tech Talk with MO! if your not sure. This is by far the lowest price unit on the market. $19.95
| GY6 Racing CDI |
 Here it is for those of you that must have the best. Racing CDI for GY6 based engines in 139qmb and 157qmj and also the 125cc version also. Works with any AC ignition systems with this type plug on it. This is similar to our orange performance CDI, but a more agressive ignition advance curve. Recommended for the serious build. $24.95 |
| DC FIRED PERFORMANCE CDI |
This is the hard to find performance CDI for your DC fired system. These are found on the Kymco Agility 50, Diamo Velocity, Vento Triton, SYM VS 125, VMOTO 125cc Monaco, Schwinn, Tomos Nitro 50, Eton sport 50, SYM sport 50, Baja SC50 Sun City, and other Chinese, Korean, and Taiwanese scooters. These also include engine type 139QMA. You will have a 3 phase type generator and regulator/rectifier. Feel free to contact us to ensure proper fit, because we're sure the price fits at just $29.95
Gave my Tomos nitro 50cc 13mph extra, very happy AAAA++++ These may not work properly with Eton Beamer or Sym Jet Euro 50 |
| PERFORMANCE IGNITION COIL |
High energy ignition coil boosts that weak spark into a real shocker. This will improve starting, acceleration, and fuel mileage. This is plug and play for GY6 scooter atv 50, 125, 150 engines in 152QMI, 152QMJ, 157QMI, 157QMJ, 139QMB, 172MM, CF250, and all other 4strokes. As on all performance parts, no guarantee, as these parts will not fix a problem you may have elsewhere. Fits all Chinese 4stroke engines as well as your budget. $19.95
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| Red hot high energy GY6 ignition coil |
This GY6 performance ignition coil is similar to our orange coil, but hotter! These fit all the fourstroke scooter/atv engines like the 139qmb, 152qmi, 157qmj, 172mm, 50cc, 125cc, 150cc, 250cc. Simple one bolt installation. Tank, Jonway, Honda Helix, NST, JMstar, etc. $24.95
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| CR7 Iridium Spark Plugs |
Longer life, more stable spark energy are just some of the benefits of our Iridium spark plugs. Get them here cheaper than anywhere else as always. $9.95
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| High performance air filters |
High flow performance air filter, clamps right onto your carburetor. Small profile to ensure tight clearance fits. Some 150's have a suspension cross member that interferes with filter installation. Not this one. Fits Tank, Sunl, Roketa, TNG, TGB, JMstar, Jonway. Just about any scooter, atv, buggy, dirt bike, etc. In our efforts to make ordering easier, and cheaper for our customers, we now have this available as a kit combined with a main jet in various sizes. 38mm for the 50cc carb. $9.95
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| 139QMB 50cc carburetor main jet |
Main carburetor jet for the high speed circuit. Get it replaced here cheap. These come in three different sizes: standard, #75, #80, #85, the popular #88, and the gas guzzling #95 75 and 80 are good for exhaust upgrades, etc, but still stock air box. 85 and 88 are for air filter upgrades. 95 for major stuff. Cheap at only $3.95
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| Performance Pre-filter |
 Want to preserve your new performance air filter and engine? This slip on pre-filter fits over our sock filters and prevents the larger particles and other debris from ever getting to your main filter, allowing it to last longer and filter more efficiently. Super cheap! $2.95 (may come in black or orange) |
| Positive Crankcase Ventilator |
 Have, or are you removing your airbox?Is your scoot blowing oil? Have you run dry and don't know why? The reason may be that excessive pressure is being built up in your crankcase, which blows seals and/or pumps all your oil out the vent. This nifty device actually creates a vacuum within your engine by only allowing air out, and not back in. Made in the USA all steel construcion easily attaches to your vent line, which should be place above your engine as far as possible, and installed on the barbed nipple end. Threaded end is left open, or attached to a filter if you wish. This is a must if your running your scoot full throttle alot. New improved model. Cheapest performance fix anywhere at only $9.95 |
| Crankcase vent/oil catch can |
Crankcase vent and oil catch can solves all your venting problems. Oftentimes, scooters and ATV's are run full throttle for extended periods under heavy load. This causes alot of pressure to be built up in the crankcase, which results in a heavy oil vapor escaping out the vent, or anywhere else it can find, like through your seals. This can blow enough oil out that you could run out of oil before you think to check the level. Adds another vent outlet by replacing your oil dipstick. Attaches to your existing line also. We highly recommend adding the PCV to the outlet of this unit also. One line attaches to the existing vent, the other to the new dipstick, the other to atmosphere via PCV valve. Easy installation with all hardware included. Works with any engine. Color may vary. $29.95
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| Performance Torque Spring |
Scooter bogging down going uphill? Why put up with it? This spring will get you moving up those hills again $14.95. Color may come in black or uncolored.
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| Performance Clutch Springs |
Get that little 50cc fourstroke ahead of the traffic at the stoplight with these cool clutch springs at only $9.95 Color may come in black or uncolored.
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| High performance clutch |
 Now that you've got the power, you better make sure you can get it to the ground now. Super sticky high temp clutch pads and rigid actuation arms make this the right part for the job. $39.95 |
| Performance clutch bell |
 Performance ventilated clutch bell. Perfect match for our performance clutch. This thing just looks cool, as well as being cooler. $29.95 |
| Performance torque sheave |
 This is an aggressively angled cam torque sliding sheave for you real performance nuts out there that must get every edge possible. $39.95 Popular item back in stock while supplies last. |
| Performance A9 Camshaft |
A9 is the sport high end camshaft for your 139qmb 49cc fourstroke scooter/atv. This will also improve your big bore performance. This will give you the top end speed potential that you need. Same Taiwanese quality parts as all our performance parts here. Tomax Racing Taiwan. $39.95
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139QMB GY6 50cc scooter moped big bore kit rings 47mm and 50mm
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This is a brand new quality Taiwanese ring set for our 47mm and 50mm big bore kit in your 50cc scooter/atv/buggy chinese engine found in many brands like Tank, Roketa, JMstar, Jonway, Vento, TNG, VIP etc |
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139QMB GY6 50cc scooter moped big bore kit gasket set
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This is a brand new quality gasket set for our 47 and 50mm big bore kit in your 50cc scooter/atv/buggy chinese engine found in many brands like Tank, Roketa, JMstar, Jonway, Vento, TNG, VIP etc |
| GY6 service and repair manual |
 Here is a CD with tens of megabytes of useful service information for your GY6, 139QMB 139QMA Chinese scooter/atv engine and chassis. This includes some wiring diagrams, the scooter book, some chassis technical info, SYM and Kymco books. Comes on a CD-R ready for you to view or print. $14.95 |
| Big bore top end assembly |
Complete top end assembly in two sizes available, both 47mm and 50mm. This includes big bore cylinder, piston, rings, wrist pin, circlips, gaskets, and a fully assembled head. Combined shipping saves you big. $119.95
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| Pre-jetted carb/performance air filter |
Don't have time or the skill to jet your carb? We now have a pre-jetted carb for your 50cc scooter. Comes complete with 18mm CVK standard carb, 38mm performance high flow air filter, and the most common #88 main jet already installed for you. This jet setting has proven to work best with these filters, in conjuction with other small performance upgrades like CDI's and coils. $59.95
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| Stage III Performance package kit |
Don't want to have to spend alot of time figuring out what you need? Get this pre-designed package for your 50cc scoot/ATV. Comes with everything you need for a nice big boost in power. Big bore cylinder, piston, rings, gaskets, clips, wrist pin, performance air filter, 7g copper core rollers, iridium plug, fuel filter, and #85 jet. Save big on package pricing and combined shipping. Ships by priority mail. Delivery within 2-3 days in the US!
Comes in 80 and 100cc based kits As low as $99.95 |
| Stage IV performance package kit |
Just gotta have the best? This is a complete engine performance package designed to boost total power up considerably. Kit includes 47mm big bore setup, performance stainless exhaust system, iridium plug, big valve racing head, 125cc intake boot, 24mm RunTong carburetor. Package price and combined shipping save you even more. Delivered to your door in 2-3 days. $329.95 to get some burnouts! Here is a posted testimonial:
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| Carburetor pilot idle jets (upgraded and standard) |
This is that little jet that causes so much trouble. If your bike is stumbling off idle, won't run when warmed up, or has been sitting for a long time and won't stay running, replace this jet and cure the problem. We also have these in upgraded sizes, like #38 and #40 (stock is #35). The larger size makes starting easier, and off idle power increased. Easy swap and cheap fix. #40 is for the real hard starters. $4.95
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| Performance transmission gear set |
Scoot revving to the max, and just not going any faster? Seem like your engine is just running too high? Need that extra top speed boost? Performance gear set gets your going. Gear ratio is a 49/17T, which is 2.88. Potential of up to 10mph top speed increase! Taiwanese quality, at a Chinese price. $39.95
Back in stock! But for how long? |
| Big bore performance gasket kit |
Compete gasket kit for your big bore 80 and 100cc scoots. Has everything you need in one nifty kit. $19.95
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| GY6-80 engine assembly |
Complete big bore engine assembly for your short case 139qmb gy6 based scoot! Bolt right into your existing mounting of your 50cc fourstroke scooter. Forget all the hassle and expense of installing a big bore kit, just get it done right and easy here. All internal electrical and CVT transmission parts installed. These have the long dual shock shaft installed. We also sell the short shaft if you need it, or re-use your original one. Easy, quick upgrade swap. $374.95
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| GY6 performance rear shock |
Gas charged, remote reservoir racing rear shock. Fully anodized aluminum with heavy duty springs greatly improves road handling and bottoming out. Works and lasts longer than original by light years! Sold as singles for rock bottom price at this quality level. $99.95
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