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Old 04-14-2008, 10:37 AM   #1
andrave
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fork oil weight and quantity recommendation for GSXR 750?

04 GSXR 750, fork seals are leaking, dealer wants a ton for the weird suzuki fluid and OEM fork seals but said if I bring in my own parts (parts unlimited seals/wipers and silkolene oil is what I'm thinking) he'll do it just for the labor he quoted me.
Mostly street bike occasional track use, adjusters normally turned towards full stiff with stock fork fluid.
I was thinking the 5w silkolene, not sure much it takes. Anyone?
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Old 04-14-2008, 10:38 AM   #2
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Old 04-14-2008, 10:40 AM   #3
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Quote:
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are you back in houston?

if so, take it to Motorcycles Unlimited.
no dealer will ever works on my bike.
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Old 04-14-2008, 10:42 AM   #4
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no.

does anyone have any suggestions for fluid or quantity?
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Last edited by andrave; 04-14-2008 at 10:45 AM.
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Old 04-14-2008, 10:43 AM   #5
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Your in Virginia?
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Old 04-14-2008, 10:55 AM   #6
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west
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Old 04-14-2008, 10:58 AM   #7
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I've got clients up there that ride. Let me email them and see if they can recommend someone.
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Old 04-14-2008, 11:02 AM   #8
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Old 04-14-2008, 11:04 AM   #9
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Quote:
Originally Posted by andrave View Post
no.

does anyone have any suggestions for fluid or quantity?
Quote:
Originally Posted by TWISTED METAL View Post
I used the 5wt oil that i got from race tech....can't remember how much though....

Wow so just 1 answer everyone just wants to hand out recommendations
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Old 04-14-2008, 11:04 AM   #10
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DON'T use the Parts Unlimited seals, most of the time they'll leak.
If the OEMs are too expensive, go with either the Race Tech seals or any other seal that is manufactured by NOK, which is the supplier for the OEM seals.

Your bike takes 5 weight and I run the oil level at 110mm.
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Old 04-14-2008, 12:39 PM   #11
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Patrick, I don't think that he will be able to tell the amount of oil he will need from your 110mm level. Unless of course he calculates the volume of the fork tubes and subtracts out the volume of the 110mm. Lol.

I think 2 bottles of fork oil will do you fine. Unless the mechanic is very sloppy. If I remember correctly, GSXRs use just over a bottle of RaceTech. Correct me if I am wrong Patrick. It has been awhile since I had to change out fork seals and oil.
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Old 04-14-2008, 12:58 PM   #12
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I heard good things about the PU "leak proof" seals, thats the first I've heard of anyone saying they have any problems. The oem's are $77 for seals/wipers through the dealer, though of course I might be able to find them less somewhere else.

just to be clear patrick you mean these:

http://www.denniskirk.com/jsp/produc...d=41606&mmyId=

would suck?
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Old 04-14-2008, 02:26 PM   #13
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oh and the oil comes in pints, liters and 1/2 liters so I dont know how much a "bottle" is...
tricky . I have the fsm at home I'll just check it tonight I guess.

dealer is really my only option, I dont know any shops around here and the only one's I've seen look like they would tell me it'd be a week and $300 paid up front and I'd never see my money or bike again.
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Old 04-14-2008, 05:27 PM   #14
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its 479 mL per fork btw.
so 1 liter should do em both as long as you don't spill more than 40 mL.
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Old 04-14-2008, 05:31 PM   #15
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I prefer the BelRay fluids, or the Ohlins fork oil.

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Old 04-14-2008, 05:34 PM   #16
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I have a 04 750 and I used the PU leak proof seals.




They sucked. Leaked like a sieve, I swear. I double checked the P/N with the people I bought them from. They were correct.

I called Patrick he recommended NOK. I drove 44 miles to Motorcycles Unlimited then drove 44 miles back home.
Rebuilt the forks again, What do you suppose happened?


They haven't leaked a drop in a full season of trackdays.

Patrick is the man.
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Old 04-15-2008, 08:46 AM   #17
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I've got the seals in stock, they're $26.95 for both, the wipers are the saem price.
Give me a shout and I'll ship them to you.

As far as the oil, although that's the quantity you need, it's not the proper way of filling the forks.
You really need to measure the distance between the top of the tube, forks fully compressed and bled, and the oil level, with the spring removed.
If you have the manual it'll explain the procedure.
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Old 04-15-2008, 10:38 AM   #18
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I do, it does, though it also has the fill quantity too. I actually ordered the other seals already before everyone started telling me that they suck... so I may put them on and if they suck order the other ones from you. I got em from DK and they have excellent customer service so maybe if they leak right away I can return em! lol.
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Old 05-31-2008, 04:19 PM   #19
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Speaking of oil weights, all 5 wt is not the same... not sure what the MFG uses to come up with those numbers, but here is a very good comparison chart for thinner and thicker fork and shock oil.

A thinner oil "should" allow the low speed damping to react quicker, but won't affect the high speed damping as much

PVD ISO Viscosity Data

By the way, the page that chart is on has a good discussion of damping.
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