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what oil weight is best ?? for the forks
 

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Depends on weather conditions and use.
In very warm weather, a heavier fork oil may be needed, just as with engine oil.
In cold weather, a lighter fork oil may be needed, again just like the engine.
Plus track/racing use may require different oil than street riding.

It also depends of they type of valving installed in the forks.
On average, it can vary from 10, 7, to 5 weight oil for cartridge forks (which your bike has).
Most forks come with 10 wt oil from the factory.

Although the correct measurement is in centistokes (cSt) which is a measurement of viscosity as viscosity can very between oils of the same weight.
 

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03 rc51 forks , stock valving . Sacramento summers 85-100+ degrees . Some track days 20% 80% street twisties turns , so not knowing much about the oil weight what would be good for me. ??
 

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The OEM oil used in the forks is Pro Honda Suspension SS-8.
This fork oil is 10wt with a viscosity rating of 39.7 cSt at 40 Deg C. and 7.6 cSt at 100 Deg C.

Most OEM cartridge forks come with 10wt fork oil.
If your forks are working fine for you, you can replace the oil with Pro Honda mentioned above or other fork oils that are equivalent.

The OEM fork oil amount for SP2 forks is 498cc +/- 2cc, and a fork oil height of 135mm to the top of the outer fork tube, with spring out, fork fully compressed, and cartridge bled of any air.
 
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