![]() ![]() ![]() The Stock Engine ExampleLet’s apply this formula to an example: On a stock scooter you often have a 12mm carburetor installed, along with a restricted stock exhaust and a bulky stock airbox. A perfect engine is determined by perfectly matching components and ideal condition (sea level, perfect weather, etc.) When using a racing exhaust and an open air filter (along with a good reed valve, etc.) you will notice that this formula will give you pretty much perfect results for any carburetor based engine (both 2-stroke and 4-stroke). Optional gear up kits available, they can lift the maximum speed up to 130 km/h. ![]() Carburetor Diameter in MM x 5The idea behind this formula is to give you the ideal main jet size for a theoretical perfect engine. Aprilia SR Manufacturer Aprilia Parent company Piaggio Production 1992 - 2020 Class Scooter Engine 49.38 cc (several different engines used) Top speed 45-50 km/h restricted, up to 85-90 km/h derestricted. Sure, the carburetor ships with a main jet, but does this match your engine at all? I found that the following formula gives you a near perfect result for tuned engines and is a perfect starting point to determine the correct main jet size!Let’s jump right into the formula as it really is a piece of cake. Especially if you don’t know where to start. ![]()
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