sounds like a bad head gasket possibly
If your 2 stroke dirt bike starts to smoke really bad that means you have to much oil in the fuel or the wrong kind of oil. Or the pistons, oil rings or cylinders are badly worn.
40:1 is the mixture of gas to 2 stroke motor oil (only)
What's does the fuel valve do on a 49cc dirt bike
It's how the engines work. for the same amount of power, a 2-stroke will be lighter, smaller and rev higher. It'll also use more fuel and pollute more. A 4-stroke will run cleaner and more efficiently. It'll make more torque but won't rev as high.
A 2-stroke dirtbike will be powered by a 2-stroke engine and a 4-stroke dirtbike will be powered by a 4-stroke engine. For the same power, the 2-stroke will be a lighter bike. For the same weight, the 4-stroke will be a weaker/slower bike. The 2-stroke is likely to use more fuel and make more noise. The 4-stroke will run cleaner and quieter.
i use a 5 gallon jug and do a ratio of 40 to 1 its a little rich but will run good
Its like having no oil in a nornal engine... No lubrication, it will stop dead an be pretty much unfixable
yes all Yamaha dirt bikes are fuel injected
no
You need to run one gallon of gas with 4 ounces of two stroke oil.That is a ratio of 32:1.
make sure fuel is getting to the carb, clean your carb and jets (in carb) check spark plug, kick harder, give it some gas if a 2 stroke
Bad fuel, dirt in the fuel filter, dirty air filter.