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Description: Standard Cylinder Stud 168mm 176mm 2-Valve Set for 139QMB 49cc-88cc. Includes two short studs at M7x168mm and two longer studs at M7x176mm. Set of 4 studs.NOTE: Long thread screw into the crankcase, the shorter thread is nutted. Recommended apply blue Loctite and torque no more than 6..

Description: Cylinder Stud M7x168mm 2-Valve for 139QMB 49/50cc 4-stroke engines.NOTE: Long thread screw into the crankcase, the shorter thread is nutted. Recommended apply blue Loctite and torque no more than 6 ft-lbs max. on these 7mm studs. For assurance please consult your manufa..

Description: Cylinder Stud 176mm 2-Valve for 139QMB 49/50cc 4-stroke engines.NOTE: Long thread screw into the crankcase, the shorter thread is nutted. Recommended apply blue Loctite and torque no more than 6 ft-lbs max. on these 7mm studs. For assurance please consult your manufacturer's..

Description: Cylinder Stud M8x187.5mm 2V Set for GY6 125/150cc 4-stroke engine. Includes 2 short studs at 187.5mm.NOTE: The long thread screw into the crankcase, the shorter thread is nutted. Recommended apply blue Loctite and torque no more than 7 ft-lbs max. on these 8mm studs...

Description: Cylinder Studs M8x195.5mm 2V Set for GY6 125/150cc 4-stroke engine. Includes 2 longer studs at 195.5mm.NOTE: The long thread screw into the crankcase, the shorter thread is nutted. Recommended apply blue Loctite and torque no more than 7 ft-lbs max. on these 8mm stud..

Description: Cylinder Studs M8x208mm 2V Set for GY6 150cc 4-stroke ZNEN engines commonly found in Lance Phoenix, Flyscooters Cadenza, ZNEN ZN150T-18, Xingyue ITA-150, Motorino Cassini, CMS Prodigy, BMS Pathfinder, and many more.NOTE: The long thread screw into the crankcase, the ..

Description: EGR Block-off Plate used for removing PCV system on GY6 engines. This plate can be used to block off the hole in your cylinder head if your emissions system is leaking or for performance applications. You will need to reroute vacuum lines on your carburetor or switch to a single vacuum ..

Description: Valve Spring Tool makes changing valves spring safer, faster, and easier than the compress clamp down old method for 139QMB 49/50cc and GY6 125/150cc cylinder head.Specifications: Includes the following Mat, and Compression rods.•    1x Rubber Base Mat•  &n..

Description: Malossi Cylinder 52mm 88cc Big Bore Kit w/Cast Piston in aluminum with hard chromed liner for 139QMB 49/50cc 4-stroke Chinese Scooter. The bore = 87.9cc capacity. The original head may be retained according to the manufacturer, but only super unleaded should be used due to the..

Description: Naraku Cylinder Head Wear-Resisting 2 valves with a larger 27.5 intake / 23 exhaust ports will allow your GY6 cylinder to breathe better! Works great with Naraku Cylinder 63mm 180cc Big Bore Kit w/Forged Piston. When changing a cylinder kit or an exhaust, it's a clever idea to pick..

Description: NCY 47mm 72cc Cast-Iron Cylinder Kit with a Cast Aluminum Piston for 139QMB. It’s recommended to get the complete 47mm big bore kit (Part# 1100-1439) in order to take full advantage of the bigger piston valve notch. However, you can use the original stock cylinder head without any ..

Description: NCY Cylinder 50mm 81cc Big Bore Kit with Cast Aluminum Piston for 139QMB. NCY GY6 50, 139QMB 50mm bore Cast Iron Cylinder Kit without a head. The perfect upgrade for most QMB139/GY6 50 scooters, this bolt-on 81cc kit will really give your scooter some go. It is recommended to get part n..

Description: NCY 58.5mm 161cc Cast-Iron Cylinder Kit with a Cast Aluminum Piston. Give your Buddy 125 based scooter some serious power with this bolt-on 161cc kit for most Buddy 125 engines. As far as we know, this is the only 58.5mm cylinder kit for the Buddy 125 engine that exists in the US. With ..

Description: NCY 61mm 171cc Cast-Iron Cylinder Kit with a Cast Aluminum Piston. Give your GY6 based scooter some serious power with this bolt-on 171.3cc kit for most GY6 125/150cc engines. As far as we know, this is the only 61mm cylinder kit for the GY6 engine that exists in the US. With most 61mm ..

Description: NCY Cylinder Head 50mm 81cc 2V for 139QMB 49/50cc 4-stroke engines. Great quality alloy cylinder head designed to work seamlessly with NCY Cylinder 52mm 88cc (Part# 1100-1248) big bore kit. Give your 139QMB the power to handle today's city traffic.NOTE: Most stock 139QMB ..

Description: NCY Cylinder Head 58.5mm Wear-Resisting 2 valves with larger intake/exhaust ports will allow your GY6 125/150cc+ 2-Valve Cylinder to breathe better! Also, works for Buddy 125cc when used in conjunction with NCY Cylinder 58.5mm 161cc Big Bore Kit (Part# 1100-1287).NCY Cylinder Head 10mm ..

Description: NCY 61mm Cylinder Head Wear-Resisting 2 valves with a larger 27.5 intake / 23.5 exhaust ports will allow your GY6 cylinder to breathe better! Works great with NCY Cylinder 61mm 171cc Big Bore Kit w/Cast Piston. A 10mm diameter head allows for extra clearance between your wrench and the ..

Description: PCV block off plate used for removing PCV system on GY6 engines. Most GY6 scooters have sub-par PCV systems often causing massive vacuum leaks that lead to poor performance. When installing this block off plate, it is highly recommended you purchase one of our case vent tubes. You will ..

Description: NCY Piston Rings made by Prima for your Genuine Buddy 50cc,  Genuine RoughHouse 50cc, and Minarelli scooter. Will fit NCY Prima Cylinder Kit: 47mm 72cc, 10mm wrist pin.Specifications:Includes the following Piston rings.•    2x Piston Rings: 47mm•    Made in..

Description: NCY Piston Rings 50mm Set for Honda Dio (AF16-AF18E) engines. The piston ring set is for 50mm Piston Cylinder. Piston and cylinder sold separately.NOTE: Properly break in your big bore kit and add about an ounce of 2 stroke oil to your gas tanks. 50cc oil injectors are not mea..