Oil change on a 1993 yz 250

I use semi-synthetic 20W50 and change the oil every 3500-4000 km.
I do the filter at the same time.

This engine holds one quart of standard Yamaha YZ 250 engine oil. The oil filter is located on the rear of the crankcase behind the suspension spring. The oil filter looks like a small metal can that is screwed into the top rear of the crankcase. On the bottom of the crankcase is the plug that will need to be removed to drain the oil from the crankcase. Anyone who owns this model dirt bike can complete this job in about 10 minutes.
Read more: How to Change Oil and Filter on a Yahama 250F ' eHow.com http://www.ehow.com/how_6574975_change-oil-filter-yahama-250f.html#ixzz1hECQRtAn

Tri-Z 250 ?

Yz 250 :

http://www.bikebandit.com/houseofmotorcycles/1986-yamaha-motorcycle-yz250s/o/m8883#sch222048

YTZ 250 :

http://www.bikebandit.com/houseofmotorcycles/1986-yamaha-motorcycle-ytz250s/o/m8800

no filter required if one of these.

buddy its simple run the bike for 10 mins to warm oil then drop the plug out underneith the engine and let it drain the once done put the plug back in and unscrew filler cap and fill the engine with 1100mls of oil then replace plug and your done also i reccomend changing the oil filter aswell

the oil in the frame is pumped into the crankcase, i had the same problem so i asked at the yamaha dealers. the dipstick on the frame is for checking the oil and the plug on the crankcase is for filling it with oil. I believe it takes about 1liter of oil from other posts but i could be mistaken

how do i check my oil level on my yz 250

Use 10w40 in the gearbox. Get the oil from your Yamaha dealer along with any filter your bike may need. Some bikes use an oil change as the "filter". To drain oil, get the engine warmed up and turn it off. Put a pan under the gearbox and remove the oil drain plug. Replace the oil plug when the flow becomes a slow drip. Change oil in late spring, the middle of summer and in early fall. Remember to lube the chain and adjust it when needed. Lubricate the cables with liquid graphite. Lastly, install a stock spark plug. Now go for a ride.

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hi mate change the oil filter also check the oil pump is working

just check the crankcase filter to make sure it isn't stopped up if it is that will make the crankcase build up pressure and blow the oil out