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When adjusting the fork oil level, compress the outer tube fully
without the fork spring.
? 09943-74111: Front fork oil level gauge
? Fork oil level (Standard): 124 mm (4.88 in)
? 99000-99001-SS5:SUZUKI FORK OIL SS-05
? Standard fork oil capacity (each leg): 351 ml
or an equivalent fork oil
(11.86/12.36 US/lmp oz
just measure your fork leg diameters and compare them to the yz ! you could also see if the yz fork clamp headstock bearings and steering tube will fit your bike !
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.
If you have the stock valving, I would run 2.5w Motorex in the damper
to compensate for the stiff feel stock, and thicker oil in the spring
chamber such as Mobil1 5w20 to allow the oil lock ring to do its job on bottom-outs. I'm at 375ml in the spring chamber and I weight 155lb.
110mm oil height in each fork tube. Remember to bleed it first to ensure all air is out the inner chamber and then measure 110mm from the top of the tube, fully compressed with no spring or damping rod inside. USe a 5W fork oil. You can also look at WWW.RACETECH.com under search, and then valving search, enter all your relevant details and bike model and it calculates it for you.
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