GY6-B / RZR-170 / 161QMK

GY6-B engine case, also known as the ScrappyDogScooters GY6-200 and 161QMK is unique in that it has 57mm cylinder stud spacing instead of the normal 54mm stud spacing. This allows for a larger bore without case reaming, typically up to 61mm whereas the standard GY6 can only go up to a 59mm / 58.5mm. The Polaris RZR-170 typically can go up to a 63mm without reaming. The Taida B case can go up to 67mm, but the two outer cam chain well bolts are slightly off, but can be modified. There are also some scooters with the engine code XJ157QMJ in Xinjue Scooters that have this type engine.

Note: Standard GY6 components such as the camshaft, variator, clutch, etc are completely compatible with the GY6-B

Showing 1–24 of 54 results



Customize your brake master cylinders with these new Anodized NCY Master Cylinder Caps.  Works great on most Honda Scooter master cylinders, as well as many various Chinese bikes.  In addition, you can add these master cylinders caps to your NCY Ruckus …

NCY EGR Block off plates for GY6 Scooter Engines


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 …

Taida GY6-150 232cc Long Crankcase Set (57mm Stud Spacing) GY6-B Case


Taida GY6 150 Long Crankcase casting quality is one of the best you can get for the GY6 engine. Taida GY6 Crankcase has been pre-machine to 70mm bore which will accommodate a big bore cylinder kits up to 67mm and …

OKO High Torque GY6 Starter Motor


OKO High Torque Starter motor for 150cc and 125cc GY6 4-stroke QMJ152/157 QMI152/157 engines. This Starter Motor is recommended for any GY6 with a Big Bore Kit or Stroker Big Bore Kit. Bolt Hole Spacing: 78mm Shaft Length: 18mm Shaft …

RnDmoto M6x60mm 304 Stainless Steel Intake Studs for GY6 139QMB


Stronger and longer lasting than original, these pure 304 stainless steel intake studs for GY6 139qmb are the hot ticket if you want reliability and performance. NOT available anywhere else! Be sure and use some anti-seize on the threads of …

RDR Chrome Silicon Steel Alloy Valve Springs for GY6 QMI/QMJ 152/157 GY6B


Light Weight RDR Chrome Silicon Steel Alloy Valve Springs for 50cc, 125cc, and 150cc GY6 and GY6B 4-stroke engines. Rated for 12,000 RPM. The extra strength and lighter valve springs are a must for high lift cams and high revving …

Universal Parts Clutch Output Shaft GY6B


Rear Clutch Output Shaft for 150cc GY6B 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 Overall Length: 7.3 inches Thread Size: M12x1.25 Bearing End Diameter: …

Ban-Jing Titanium Oxide Clutch Bell For GY6


Great performance clutch bell for the GY6 150cc engine made by Ban Jing in Taiwan. – Very high quality Clutch Bell with a Titanium Oxide Rainbow finish. – Perfect for those running open CVT Covers to show it off. Lightweight, …

RnD Moto GY6-B / GY6-200 Complete Big Bore Engine Assembly w/ Shifter for ATV / buggy / 4wheeler


OOF! Big bore 200cc engine assembly for your ATV/buggy/4wheeler finally! This is a complete engine that will fit in your buggy 125 or 150cc application with little or no modifications. Comes with forward,neutral, and reverse gear shifting transmission short case. Will attach to …

SSP-G 63mm Big Bore Head for GY6-B Scooter engines and RZR-170 ATV’s


Performance Big Bore Head for the 161QMK GY6-B and RZR-170 ATV’s engines! Exhaust Valve Diameter: 22.8mm Exhaust Port Diameter: 22mm Exhaust Port Bolt Hole Spacing: 50mm Intake Valve Diameter: 27.75mm Intake Port Diameter: 23mm Intake Port Bolt Hole Spacing: 45mm

SSP-G 63mm BBK Cylinder Set for GY6-B case scooter engine and Polaris RZR-170 ATV’s


Taiwanese made BBK for your 57mm wide stud spacing GY6 based engines! Cylinder Bore: 63mm Overall Height (cylinder): 93mm Fits the Polaris RZR 170. Polaris Ranger RZR 170, Various unlisted makes/models  

Motoforce Racing Spark Plug Cap – Plastic 90 degree angled


Spark Plug Cap 90 degree plastic High-quality spark plug connectors and cables. Both connectors have a 90° angle and are made of plastic You’ll always get excellent value for money with MotoForce, one of the reasons for the success of …

Straightline Performance Fuel Injected and Carbureted Scooter and Small Motorcycle Nitrous Kit


Fuel Injected and Carbureted Scooter and small single cylinder motorcycle Nitrous Kit (6 or 9 HP) Nitrous Kit. Straightline Performance is now proud to be the exclusive distributor of the Holtzman Engineering Nitrous Technologies. This includes the patented nitrous injector …

Motoforce Racing Spark Plug Rubber Anti Vibration Connector Cap – 90 degree angled


Spark Plug Cap 90 degree rubber High-quality spark plug connectors and cables. Both connectors have a 90° angle and are made of rubber. Vibration dampening, ideal for use in racing situations. You’ll always get excellent value for money with MotoForce, …

Prodigy BR3 Performance Clutch and Bell for GY6, Kymco, SYM 125/150cc


Product BR3 Racing clutch No. 12131200 Model GY6 125 Description The clutch provides good performance of clamp load, friction and durability. Materials is composite fiber. The bell friction surface 100% circle cutting of clutch bell which helps reduce slippage and …