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1985 YZ250N, With the Fork off, Cap off, Spring out, take a clear school plastic ruler pore in 5W synthetic fork oil till it's 135mm from the top with the fork tube all the way down, till it just touches the ruler and the 135mm mark. Reinstall the spring, pacer, washer, Damping rod to cap, and install back in the clamps. I raced this bike for 18months in 1985/1986. Change the seals when they leak and toss the 38Kg Fork springs for 41Kg + springs to your riding weight. Over all was a good fork for it's time and Race tech can rebuild the fork and shock to your riding style and you're riding weight. I Miss the Fork flex on hard landings to my other New bikes. I still ride and Race the 85,YZ490 with the same fork.
Should be 3.5 Liters / quarts with the filter change. Put in 3 liters then top up as needed to get the level to the top of the viewing window.
To check your oil, bike should be level, on it's center stand, engine should NOT be running!
Any oil viscosity between 10w30 and 20w50 will work just fine. Smaller numbers if the weather's cooler and/or you only do short rides. Bigger numbers for hot weather and longer rides.
Put your bike on the high stand and thn check the oil level at the right handside cover just above the brake pedal. It should be fully covered with oil.
The standard capacity of oil for is around 2.5litres without the oil cooler and if with oil cooler (the one tht frm XJ650) the oil capacity is thn 3.8 litres.
For more info plz visit www.xjbikes.com
Should be drain screws at the bottom, close to the axel shaft, and one giant bolt on the top of the fork where it comes out of the triple clamp. Remove the lower to drain, replace it. Refill by removing the upper. If I recall correctly, it wants 250ml of fork oil (typically a special 5w oil you need to buy at a motorcycle shop DO NOT USE ENGINE OIL!)
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