Yes
No if it says 4 stroke or 4 cycle you can not put it in a 2 stroke or 2cycle engine.
Engine rebuild is the answer. Oil is on the plugs because either the valve seals are worn, or the piston rings are, and if you are going to do one you should probably do both. Backfiring could be ignition of the fuel in the exhaust due to the fouled plugs but is usually a timing issue. This is true if the engine is a 4 stroke, if it is a 2 stroke the oil induction may be malfunctioning or your mix ratio is wrong.
swap engines. they work completely differently and cannot be changed.
a four stroke has a timing chain and a cam and a two stroke doesnt a two stroke has reed valves
2 stroke, 4 stroke, and rotary (although this one hasn't been made for a while).
i don't think it has 4 gears it has five according to mine You put fuel in the tank and put oil in the crank case on a 4 stroke motor cycle.
I think 60mph to 65mph approx. is the top speed for this bike.motorcyclesdir.com/
Any motorcycle oil with the weight 20W50. I use Valvoline 4 stroke motorcycle oil 20W50 and it works fine!
not completely sure what the question is asking butr i believe it is asking why is the 4-stroke engine taking over the makrket.I believe it is because of the even power they make as trhe 2-stroke has a strong powerband which can make the bike more difficult to ride/race.the 4-stroke is unfair in its way b/c the 250cc 4-stroke races with the 125cc 2 stroke.
Usually the average is about 4 ounces of oil per gallon of gas
Any 4-stroke 10W-30 motorcycle oil can be used in clutch case.