Your timing is off in most cases, or your carburetor needs adjusting.
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.
It is generally accepted that a 2-stroke is more powerfull than a 4-stroke - for each full cycle (induction, compresion, ignition, exhaust) a 2-stroke engines crank rotates twice and a 4-strokes engine rotates 4 times. Therefore, for each 4-stroke Bang you get Bang, Bang from a 2-stroke! 4-stroke engines are far more efficient though and 2-stroke engines are getting close to being legislated out of existence (we have just lost 250cc Motorcycle GP racing in preferance for 600cc 4-strokes).
Any 4-stroke 10W-30 motorcycle oil can be used in clutch case.