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The HAYNES Honda CX500 V-Twin Owners Workshop Manual 1978 onwards (published in 1979 - ISBN 085696 442 5) states on page 90:

Fork capacity (per leg): 135 - 140 cc (4.5/3.8 - 4.7/3.9 US/Imp fl oz). Damping fluid type: Automatic Transmission Fluid (ATF).

Front Forks: Type - Telescopic, oil-damped.

Spring free length:-

Upper spring ... 98.2mm (3.87in) Service limit ... 90.1mm (3.55in)

Lower spring ... 461.7mm (18.18in) Service limit ... 449.5mm (17.70in)

Stanchion bend (max) ... 0.2mm (0.008in)

Note however page 94 states 135 - 145 cc (4.5/3.8 - 4.7/3.9 US/Imp fl oz) of ATF fluid.


Don't use ATF, it's rubbish, despite what the Haynes book of lies tells you.  ATF fluid foams and looses all damping capability when under load.  Use a minimum fork oil weight of 5 and a maximum of 15 if you ride a CX500 z/A/B model (78-83).  


You can go to a heavier weight oil if you have a Silverwing Interstate (500 or 650) but only 20 weight max, any more than this and you run the real risk of blowing the fork seals - from trial and error the members of the CX-GL MCC UK have found that its better to put a loading slug in the top of the fork on all models,  than it is to try and increase damping effect with a heavier fork oil.


Reproductions of Genuine Honda workshop manuals are available (in most cases free) from the MCC shop!  


WARNING - There are at least two know errors in the Haynes workshop manuals which, despite being pointed out to them, they persist in publishing year after year!

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Q: What is the fork oil level 1978 Honda cx500?
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