Naraku Racing Variator Kit for 50cc 4-Stroke 139QMB Chinese Honda Cloned Scooters, Kymco, SYM INCLUDES: Variator Variator Back Plate Variator Pin Roller Weights (2 sets) Torque Spring COMPATIBILITY: Amigo – 50cc 4-Stroke Scooters Apollo – 50cc 4-Stroke Scooters Baotian – 50cc 4-Stroke Scooters Baron – 50cc 4-Stroke Scooters Bintelli – 50cc 4-Stroke Scooters BMS – 50cc 4-Stroke Scooters Coolster – 50cc 4-Stroke Scooters CSC – 50cc 4-Stroke Scooters Diamo – 50cc 4-Stroke Scooters Flyscooter – 50cc 4-Stroke Scooters Ice Bear – 50cc 4-Stroke Scooters Italica – 50cc 4-Stroke Scooters JCL – 50cc 4-Stroke Scooters Jonway – 50cc 4-Stroke Scooters Kandi – 50cc 4-Stroke Scooters Kinroad – 50cc 4-Stroke Scooters KMD – 50cc 4-Stroke Scooters Kymco – 50cc 4-Stroke Scooters Lance – 50cc 4-Stroke Scooters Leike – 50cc 4-Stroke Scooters Linhai – 50cc 4-Stroke Scooters Longbo – 50cc 4-Stroke Scooters Motobravo – 50cc 4-Stroke Scooters Motofino – 50cc 4-Stroke Scooters Motorino – 50cc 4-Stroke Scooters NST – 50cc 4-Stroke Scooters Peace – 50cc 4-Stroke Scooters Puma Cycles – 50cc 4-Stroke Scooters Redstreak – 50cc 4-Stroke Scooters Roketa – 50cc 4-Stroke Scooters Scootstar – 50cc 4-Stroke Scooters Schwinn – 50cc 4-Stroke Scooters SSR – 50cc 4-Stroke Scooters SUNL – 50cc 4-Stroke Scooters Supermach – 50cc 4-Stroke Scooters SYM – 50cc 4-Stroke Scooters Tank Sports – 50cc 4-Stroke Scooters TaoTao – 50cc 4-Stroke Scooters Trailmaster – 50cc 4-Stroke Scooters Veloz – 50cc 4-Stroke Scooters Verucci – 50cc 4-Stroke Scooters Vitacci – 50cc 4-Stroke Scooters Viva – 50cc 4-Stroke Scooters Wolf – 50cc 4-Stroke Scooters Xingyue – 50cc 4-Stroke Scooters ZNEN – 50cc 4-Stroke Scooters NARAKU COMPLETE 139QMB AND KYMCO RACE VARIATOR KIT. The Naraku HS-High Speed vario is an evolution of one of the most successful variators for 4-stroke vehicles. The roller ramp design results in a maximum of torque and top speed. The key to a good variator is its ability to keep the engine at constantly high rpm over a wide range of vehicle speeds, which makes the HS variator one of the best ones for 4-stroke engines. Even other renowned manufacturers find this a hard nut to crack. Another advantage for tuners without much experience is the fact that the Naraku HS variators come already pre-adjusted. This version comes ready to install for all standard 50cc engines without modifications. Using a stronger torque spring is not recommendable for 50cc engines without further tuning. However, if other tuning parts are used, a new setup may be required. Included in the delivery are the complete variator, open variator bushing with speed control washer as well as a set of variator rollers (16 x 13mm) suitable for 50cc original cylinders. Note: Please make sure this scooter engine part fits your particular scooter model. Many scooters have the same name but use different engine parts depending on the year of manufacture. SKU NK900.21 Old SKU NK600.07 RP-NK900.21 variator – vario kit Naraku high speed racing – Kymco 4-stroke, 139QMB QMA GY6 50cc QMB139. The NARAKU HS High Speed Variator is one of the most successful development of a variable speed for 4-stroke vehicles. The design of the roller tracks results in a maximum of torque and top speed. The secret lies in the variator of a good fortune during the translation process, the performance speed to continuously maintain the highest possible level. In this context, the HS-variator one of the best variable speed for 4-stroke engines. Even other renowned manufacturers bite here from the teeth. Another benefit for all is not as ambitious tuner that will NARAKU HS variators already voted delivered. This version is ready for installation for all 47mm and 51mm cylinder kit NARAKU using the included back-pressure spring. Sentences should be 47mm with the 5.8 g and 51 mm down to 6.3 grams. However, should additional other tuning parts have been installed, the vote may differ and must be redefined. Item Nr.: NK900.21 EAN/UPC: 4250362411259. RACING PARTS FOR 139QMB. PARTS FOR SCOOTERS QMB 50cc GY6. **