These are pretty easy to replace and a must if you want to upgrade your engine's performance with performance parts or upgrades. 8, length 8mm) for the GY6 125cc and 150cc 152qmi and 157qmj engines. If you don't your engine can sieze on you. If it is 50 degrees colder you would increase your jet size at least one step up. When the air is colder it requires bigger jets because cold air is more dense. You will want to go down one (1) jet size for every 1750' to 2000' you go up in elevation. At 4000' feet you will have lost about 12% of your power output. You will loose about 3% in power for every 1000' in elevation. When you are dealing with elevation you will want to rejet to prevent your engine from siezing and requiring a rebuild.
This jet requires at least a Performance Air Filter.Īltitude can play an issue in scooter performance. You will want to go down one (1) jet size for every 1750' to 2000' you go up in elevation.
If you upgrade beyond small adjustments you will want to install a Performance Exhaust to handle the increased combustion and minimize back flow issues.Īltitude can play an issue in scooter performance. For smaller upgrades replace the stock air filter with a Performance Air Filter for this engine. Mechanics Note: If you increase the size of your stock carb jet you will want to improve your air flow both in and out of the engine. (Click on the parts for additional pictures)
Here are just a few of the many brands and models this very common engine is found on:Īvanti Beta 150, Avanti Epsilon 150cc, Baja, Bemine 150 Touring, Diamo 150, Diamo, Velux 150, Genuine Blur 150, Genuine G-Max, Howhit 150, JMstar, Jonway, Jonway YY150T- 2, Kinroad XT150T-8, Kymco, Lifan 125/150, Lifan L150T-7, Loncin 150, Longbo 150, Longbo LB150T-12, Mod Cycle 150, NST, Peace Sports 150, Primo "Strada" Streaker 150, Primo Terminator 150cc, Racer 150, RAD-10 150cc, Retro 150, Roketa, Roketa Fiji MC-04, Roketa Tahiti MC-03, Schwinn, Spigaly 150, Strada 150CE, Strada Chrome Edition RX150, Strada RX150TE, Strada RX200HP, Sunl, SYM, Tank, Tank 150cc (various models), Tank Racer 150, TNG, Tomos, Velux 150, Vento Phantom GT5 150cc, Vento Phantom R4I 150cc, Verucci Permier 150GTX SE, Verucci Viper 150GTX, VIP, Wangye 150, Wussi 150, Znen and many others. This engine is used on many scooters, dirt bikes, quads, ATVs, go karts, and buggies.
This type-A Honda clone engine has a automatic CTV transmission.
This has a displacement of 149.6cc (157QMJ) has a bore size of 57.4mm and a stroke of 57.8mm. The 152QMI (GY6-125) & 157QMJ (GY6-150) (QMI152 QMJ157) is a horizontal, single-cylinder, four stroke, forced air cooled engine. GY6 125cc 150cc (152QMI 157QMJ) Performance Parts