What size main jet should I use?
A larger jet number means a bigger hole and more fuel. A smaller jet number has smaller holes and should be used if your engine needs to run more lean. Whether your machine is running too lean or too rich is a good starting point for choosing your jets, but using a jet calculator minimizes trial and error later.
How much horsepower does a GY6 150cc have?
The engine is capable of producing 12,000 rpm and power upwards of 14 horsepower (10 kW) with modifications according to end-users. The GY6 engine has a built in swing arm with automatic CVT transmission that is belt driven.
What happens if main jet is too big?
Typical Lean Conditions: (A too-large main jet also mimics this symptom.) – The engine runs hot, knocks, pings and overheats. – The engine surges or hunts when cruising at part-throttle. – Popping or spitting through the carb occurs when the throttle is opened.
What does pilot screw do on Carb?
The pilot air screw and pilot jet. The air screw can be located either near the back side of the carburetor or near the front of the carburetor. If the screw is located near the back, it regulates how much air enters the circuit. If the screw is turned in, it reduces the amount of air and richens the mixture.
How fast is a 150cc GY6?
For example, a 150cc scooter has a top speed of 60 mph and gets up to 70 mpg, while a 250cc scooter can reach 75 mph but will get fewer than 60 mpg. However, you may not be able to use a scooter on the freeway; check local engine size or horsepower minimums.
What does a slow jet do in a carb?
Slow (Pilot) Jet – idle to off idle. Needle Clip Position – ¼ to ¾ throttle. Needle Type – ¼ to ¾ throttle. Main Jet – ¾ to wide open throttle.
Does Kymco use GY6?
Current brands of import bicycle lines that use the Honda GY6 cloned engine advancement include: Kymco, PGO (imported by Genuine Scooter Company in the USA), Ricardo Motors, Roketa, Strada, SUNL, Tank, Vento, Yamati, and various others.
What does GY6 stand for?
Gy6 is a designation used for an engine design installed on motor scooters produced in some Asian countries. The component, however, is also used for motorcycles and three- or four-wheelers known as all-terrain vehicles (ATVs).
How do I know if my main jet is too rich?
If the pilot circuit is rich, the engine will have a rough idle or may not return to idle without “blipping” the throttle. You may also notice a distinct smell of raw fuel and some eye irritation from the exhaust.