When an oil is engineered for any application, it all starts with a base oil. The base oil is then blended with additives for a specific use and the formulated oil is packaged and distributed for sale to consumers.
Troubleshooting a gravity and vacuum fuel delivery system always starts with the same two basic items. Is fuel in the tank, and is the fuel filter in good condition?
Check out this video from the experts at Cyclepedia as they disassemble a Honda TRX90 engine and discuss some ways to deal with stuck nuts and studs on motorcycle and ATV engines.
Carburetors control the amount of air and fuel entering the engine to provide the correct mixture for combustion. To do this over a wide operating range, multiple fuel circuits are employed.