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Description: Crankcase 63mm Bore A-Block 54mm GY6 longcase. The crankcase bore is a 63mm opening and can fit 54mm A-Block 61mm cylinder and 61mm cylinder head.NOTE: This is NOT a complete engine. Need to reuse donor parts from A-Block (54mm) or B-Block (57mm) ..

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 52mm 88cc Cast-Iron Cylinder Kit with a Cast Aluminum Piston for 139QMB. Want a real screamer? Then this 88cc big bore kit for you! NCY Cylinder 52mm 88cc Cylinder skirt diameter 54.5mm may not be it’s a bolt-on for some 139QMB 49/50cc scooters.It’s also recommended to get a 52mm bi..

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 52mm 88cc Aluminum Performance Cylinder Head with 2-Valves' 21.5mm intake / 19mm exhaust. Great quality alloy cylinder head designed to work seamlessly with 1100-1248 88cc cylinder kit. Give your 139QMB the power to actually get some respect.NOTE: Most stock 139QMB cylinder hea..

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: 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..

Description: SSP-G Crankcase 180cc Big Bore Power Kit for upgrade GY6 125/150cc 4-stroke longcase engines. This complete Power Pack comes with a 63mm bore cylinder and matching Machined out Crankcase (57mm B-Block) with all the oil seals installed and a performance camshaft for low-end power/to..

Description: SSP-G Crankcase 65mm Bore Right-Side with Oil Cooler Kit for upgrading to 180cc Power Kit with oil cooler or any GY6 57mm cylinder stud spacing such as Taida B-Block cases. This SSP-G Crankcase 65mm Bore Right-side with Oil Cooler Kit comes with a 65mm bored opening with a 57mm stu..

Description: SSP-G Cast-Iron Cylinder 63mm 180cc with Cast Aluminum Piston for upgrade 125/150cc 4-stroke. The cylinder piston is 63mm. Require GY6 57mm Stud Spacing Crankcase B-Block. Also, a good replacement cylinder kit for the Polaris RZR 170.NOTE: Please, measure with a caliper GY6 cr..

Description: SSP-G Cylinder Head Wear-Resisting 2 valves with a larger 27.75 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, t's a clever idea to pick ..

Description: Taida Crankcase 65mm Bore Right-side with Oil Cooler Ports for upgrading to a 180cc with optional oil cooler kit (see Part# GY6-050-NOKS oil cooler kit sold separately) or any GY6 54mm cylinder stud spacing such as Taida A-Block cases. Taida Crankcase right-side with oil coole..

Description: High-Quality Taida Improved Crankcase 67mm B-Block 57mm GY6 longcase. The crankcase bore is a 70mm opening and can fit 57mm B-Block 67mm cylinder and 67mm cylinder head 4V with added Taida Crankshaft 66mm (8200) 4V = beast power 232cc!! No Boring Required! Just bolt-on!NOTE: Also, avail..