How much fork oil? - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 9 (permalink) Old 03-03-2010, 09:21 PM Thread Starter
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Thumbs up How much fork oil?

Hi guys new to the forum and I just got my self an 02 and I just did the revalve and resprong but when I check the service manual it does not explain what height on the forks? . It said is 135mm of fork oil but dont explain if this mesarument is for the sp1 or sp-2.....if anybody could give me some pointers....thanks ind advance
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post #2 of 9 (permalink) Old 03-03-2010, 10:52 PM
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For the SP2, the service manual asks for 498 +/- 2.5 cc of fork oil.
For SP1 forks, it asks for 513 +/- 2.5 cc of oil.

Now what that equates to in oil level I'm not sure.
However, I've bought the Traxxion Dynamics fork cartridge kit and they recommend 120mm of oil level if that is any help.

Just in case you didn't know, the oil level only affects the air spring effect towards the end of fork travel. You adjust the oil level to prevent the forks from bottoming out at full compression.
The air spring acts as a safety cushion. Otherwise it has no overall effect on damping.
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post #3 of 9 (permalink) Old 03-06-2010, 08:12 PM Thread Starter
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thanks, I have read other treads and I think I will ad a bit more that the stock level wich is 135mm I think I will do 130 to 120 like you have it in yours... in my other bikes I have them stock and they feel great but I have read that b/c the RC is a bit heavy I should have a bit more oil specially since I have softer springs than the stocks.....
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post #4 of 9 (permalink) Old 03-08-2010, 01:10 PM
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I was actually wondering this too. I am putting new fork seals in my SP-2 in a couple weeks and have no idea how much to put in. Any input would be greatly appreciated.

BTW i bought 5W oil
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post #5 of 9 (permalink) Old 03-09-2010, 12:29 PM
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If you did a re-valve & new springs that will change the oil height level. The spring and/or valve company should have listed the type/amount of oil needed. I know usually you go with a lower oil height with a stiffer spring.
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post #6 of 9 (permalink) Old 03-10-2010, 07:41 PM Thread Starter
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I think `ll go with 130 to 125mm just b/c I do more track days than street riding and I have read in some of the track & racing forums that adding more oil is good for suspention settings....will see how it feels

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post #7 of 9 (permalink) Old 03-10-2010, 10:49 PM
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If you add too much oil, the air spring effect may cause the forks to be harsh towards full compression.
It's the viscosity of the oil and valving that effect overall damping properties.
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post #8 of 9 (permalink) Old 03-12-2010, 08:03 PM Thread Starter
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well I just finish the rebild of the forks and I stayed 135mm stock and I left it 3 clicks off hard of comprecion damping and it seems ok with my starting suspention set up just have to take it to the street and track and see how it goes.....thanks for all the replys!

Love my Honda`s
2000 CBR929RR(my baby) Gone
2003 CBR600RR (track bike) Gone
2002 RC51(track, sometimes street) ... Gone

Current:
2007 CBR 600RR
2013 Aprilia RSV4 R
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post #9 of 9 (permalink) Old 01-18-2012, 09:59 PM Thread Starter
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for the next season for track I will have to add about 10mm of oil b/c I am bottoming out the forks, but other than that is all good

Love my Honda`s
2000 CBR929RR(my baby) Gone
2003 CBR600RR (track bike) Gone
2002 RC51(track, sometimes street) ... Gone

Current:
2007 CBR 600RR
2013 Aprilia RSV4 R
#70 "I" group NESBA
Blue group TPM
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