Re: is a 2 stroke motorcycle engine have an alternetor?
Yes all motorcycles have an alt. its on the left side case its in the engine and what you have to do is remove the cover which may have around 6 - 8 bolts on it. cdi is not an alternator it stands for capacitor discharge ignition and it is an ignition unit . BTW which make amd model is ur motorcycle. the locations may change on some models.
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On these engines, the two cycle oil is for lubrication of the crankshaft, rod bearings and piston wrist pin during operation. The transmission is separate from the moving engine components and requires oil for lubrication of the bearings, shafts and gears. There should be an oil port on the top of the transmission case for filling. Some have a dip stick on them and some have a site glass in the side of the transmission housing to visually see the level of the oil.
There is no place to add additional "oil to the engine" as you ask, but as the engine and transmission cases are attached at the base of the cylinder, its easy to see how someone can assume the transmission oil may be engine oil. Its not. The transmission oil also serves duty as lubricant for many motorcycle and 4 wheelers 'wet clutch' assembly as well. Low oil in the transmission could be detrimental to the clutch discs.
Your standard lawn mower engine of 200cc produces about 2.5 hp.
Some production high-performance cars produce one horsepower for every cubic inch of displacement, a 200cc engine is 12 cubic inches, so if your little 200cc motor is engineered as well as these cars, it could produce 12 horsepower.
The above pertains specifically to four stroke engines. If your 200cc motor is a two-stroke, you can easily double those numbers because a two-stroke hits every time the piston travels up.
You may also note that some 200cc motorcycles can produce as much as 50hp
If this is a 2 stroke engine it does not require an oil change. If this is a 4 stroke engine most motorcycle manufacturers recommend 10W40 oil and an engine that size should require approximately 3 QTS of oil. However, personally I have always used 20W50 in all of my 4 strke motorcycle engines. You also mentioned a problem what is the problem with the KX 125?
2001 Yamaha YZ80 Specifications
Bore x Stroke
47 mm x 47 mm
6 - speed
Fuel Tank Capacity
Wheels and Tires
Cost when new
It depends if you still have a pre mix tank already fitted. Mine came with the pre mix tank taken off. It is a white coloured container in a fairly flat shape on the 98 model which should be underneath the seat when you lift it. Not sure about newer models. It should have 2 stroke oil in (quite often pink). If not I have been advised to mix the 2 stroke with the petrol at about 50:1 ratio, however I would check with your local motorcycle shop or Aprilia dealer. Alternatively get a workshop manual for the correct year of bike and it will give you all the information you need in there. Also if the tank runs to empty it has to be bled otherwise if air is in the pre mix tank it can cause damage to the engine.
a biger 4 stroke engine will out live a smaller 2 stroke engine many times over,,, but it all depends on how well its serviced and how its driven,,,belting the guts out of it all day and its not going to live very long