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Samurai 58.5mm 155cc Big Bore Cylinder Kit for Yamaha Zuma 125

$185.99

Samurai 58.5mm Big Bore Cylinder Kit for the Yamaha Zuma 125. Upgrades your engine to 155cc! Bore: 58.5mm Overall Height (cylinder): 93mm *Professional installation is recommended. Some modification may be required.

Athena Cylinder Kit With Head – 80 Cc – ø 47,6 Long Stroke

$259.99

In this kit the stroke is increased to 43 mm. You need to order the relative crankshaft. ATTENTION! To assemble this crankshaft it is necessary to bore out the housing diameter. All ATHENA products, which are manufactured with higher displacement …

Top Performance 70cc Cylinder Kit Top Performances Trophy 70cc for Minarelli LC

$249.99

Minarelli Race 70cc Cylinder Kit Top Performances Trophy 70cc for Minarelli LC by Top Performance Scooter Parts One of our best Streetrace cylinder from Top Performances. The power output is much like that of the Stage6 Streetrace cylinder, Stage6 Sportpro …

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

$109.99

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

RnDmoto 50mm Big Bore / Big Valve Performance Head for GY6-50 139QMB

$109.99

Big bore head for 50mm big bore kits. Made in Taiwan and NOT cheap china, these feature 21mm intake and 19mm exhaust valves with high flow ports, quality valve springs and top notch casting and machining. Like no other at …

Taida Big Valve Performance Cylinder Head for Yamaha S-MAX 155 23/21

$499.99

Big Valve head made by famed Taiwanese manufacture Taida Motor. 4 valve head with roller rocker arms for your Yamaha S-Max ! These are intended to be used with our Taida big bore kit in 63.5mm With bigger valves ( …

Alchemy / RnD Moto Roller Rocker conversion kit for GY6 !!!

$174.99

Complete kit to convert your GY6 based scooter or ATV engine to a much more efficient and performance oriented valve actuation system. Roller rockers reduce friction, last longer, and allow a faster, steeper, and higher valve lift without causing excessive …

Stage6 R/T Cylinder Kit “MKI “70cc Piaggio NRG / Runner BBK

$399.99

Stage6 R/T 70cc Cylinder Kit MKI Piaggio NRG / Runner, a top-of-the-range “Hyper Racing” kit with a 47.6mm diameter (70cc) developed by Stage6’s R/T department (“Racing/Team”) for Piaggio / Gilera LC. The kit includes: Nikasil-plated Aluminium Cylinder with 6 transfer …

Stage6 R/T Big Bore Cylinder Kit “MKI” 70cc Minarelli / JOG / Yamaha Aerox / MBK Nitro BBK

$379.99

Stage6 R/T 70cc Cylinder Kit MKI MBK Nitro / Aerox,  a top-of-the-range “Hyper Racing” kit with a 47.6mm diameter (70cc) developed by Stage6’s R/T department (“Racing/Team”) for Minarelli horizontal. Nikasil-plated Aluminium Cylinder with 6 transfer ports and a bridged exhaust port HQ Piston, …

SSP-G 61mm Cylinder Head for 150cc and 125cc GY6 4-stroke GY6 QMI/QMJ 152/157

$109.99

SSP-G GY6 61mm Complete Cylinder Head for 150cc and 125cc GY6 4-stroke engines and engine based vehicles. Exhaust Valve Diameter: 23mm Intake Valve Diameter: 27.75mm Exhaust Port Diameter: 26.5mm Intake Port Diameter: 27.5mm

SSP-G Zuma 50F Big Bore Cylinder & Head Kit – 47mm BBK

$449.99

SSP-G 47mm Big Bore Cylinder and Head Kit for the Yamaha Zuma 50F 4 Stroke Liquid Cooled Scooter and many other makes and models including the Vino Classic 50cc (4 stroke model). Upgrades to 75.6cc displacement! Includes cylinder, 3-Valve cylinder …

Taida Motor 4 Valve Springs For GY6

$32.95

Lightweight performance valve springs mean less float and more go! We’ve got em in stock for the 4 valve heads and 2 valve are available. $32.95   GY6-4V SP GY6 Valve Springs 4V(upgraded) 4/set

Taida Performance Motor Valve Set 2v 30.5/26.5 for GY6 125/150cc

$69.99

Performance Taida Valve Set 2V larger 30.5/26.5 intake / exhaust valves. This Taida Valve Set 2V 30.5/26.5 fits Taida Cylinder Head [63mm-67mm] 2V for GY6 180cc-232cc engines (scooters, quads, and buggies). To increase performance, we suggest a performance camshaft. Specifications: …

SSP-G Piston Kit for 4-Valve Head 63mm For GY6

$39.99

SSP-G GY6 Piston Kit for 4-Valve Head. Choose from 63mm   Fits: Avanti, Baja, Baotian, Baron, Bashan, BKM Sauron, Boreem (BMS), Boss, Bravo, CFMoto, Diamo, Dotera, Eton, GY6 QMI/QMJ 152/157, Honda, JM Star Tomahawk II, Kazuma, Kymco, Lifan, Qingqi, Redcat, …