Fork Fluid

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Fork Fluid

Post  Chris_w_65 on Wed Jul 29, 2015 9:42 pm

What the fork is the weight of the "fork fluid" they refer to in the factory Honda XR650R workshop manual? They suggest this for front and rear although shock fluid is probably better for the rear.
In the book it says 637CC for the front forks - Is that the total for the 2 forks?
I have a 1 liter bottle of 3wt shock oil and a 1 liter bottle of 5wt fork oil - Is that about right?
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Re: Fork Fluid

Post  Mauser on Wed Jul 29, 2015 9:54 pm

Hi Chris I did this a few years back might help....
http://www.xr650r.co.uk/service/forks/forks.shtml

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Re: Fork Fluid

Post  Chris_w_65 on Wed Jul 29, 2015 10:04 pm

Mauser wrote:Hi Chris I did this a few years back might help....
http://www.xr650r.co.uk/service/forks/forks.shtml

Just like milking a cow Very Happy

Thanks, I will grab another liter of Motul 5wt to match the one I have so I will have enough.
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Re: Fork Fluid

Post  BuRP on Thu Jul 30, 2015 8:55 am

Fork oils may be mixed to get a 'halfway-house' weight, however I'd only use the same brands then.
Say you want a 4 - mix equal parts of 3 & 5 weights, and Bob's your uncle. You are building a SM hence you'll have precious little info to go by, so you'll have to experiment somewhat I guess.
Further, a given volume of oil is a bit clumsy to work with, however reaching/changing a level is way more easier - suck excess out as per Maus' link.
However, if you change the oil then make sure all the old stuff - and I mean ALL - is out, so you'll either have to dismantle the lot or flush is a few times very well.
Last but certainly not least, if it's the original fluid you replace (ie the very first time) then I'd dismantle and clean to perfection first.... as the OEM-filling is referred to as WhaleSnot, it simply is rubbish. And, when you've all taken apart anyway I'd modify the shimstack and maybe drill some bores as per your requirements... which you probably better leave to an expert, no offense pls.
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Re: Fork Fluid

Post  Chris_w_65 on Thu Jul 30, 2015 9:01 am

BuRP wrote:Fork oils may be mixed to get a 'halfway-house' weight, however I'd only use the same brands then.
Say you want a 4 - mix equal parts of 3 & 5 weights, and Bob's your uncle. You are building a SM hence you'll have precious little info to go by, so you'll have to experiment somewhat I guess.
Further, a given volume of oil is a bit clumsy to work with, however reaching/changing a level is way more easier - suck excess out as per Maus' link.
However, if you change the oil then make sure all the old stuff - and I mean ALL - is out, so you'll either have to dismantle the lot or flush is a few times very well.
Last but certainly not least, if it's the original fluid you replace (ie the very first time) then I'd dismantle and clean to perfection first.... as the OEM-filling is referred to as WhaleSnot, it simply is rubbish. And, when you've all taken apart anyway I'd modify the shimstack and maybe drill some bores as per your requirements... which you probably better leave to an expert, no offense pls.

Already nice and clean with 15wt but the forks are too slow so I can just drain and fill and refill - I have access to the syringe tool to do the level and a nice fork stripping bench - Actually, I have 0.5l 15wt and 1lt 5wt (both Motul) - This will give me 8.3wt to try
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Re: Fork Fluid

Post  Chris_w_65 on Thu Jul 30, 2015 7:48 pm

Done, refilled with 5wt and suspension is much better
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Re: Fork Fluid

Post  BuRP on Fri Jul 31, 2015 12:37 pm

Fork fluid?
Fork yourself man!
BRP smile Bump

Gotta love raping idiom razz
So, the fluid's in ----- how's the effect?
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Re: Fork Fluid

Post  Chris_w_65 on Mon Aug 03, 2015 8:43 pm

BuRP wrote:Fork fluid?
Fork yourself man!
BRP smile Bump

Gotta love raping idiom razz
So, the fluid's in ----- how's the effect?

Much better but much more dive now.

I must get directions and come drop off your tools before you do fork me
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Re: Fork Fluid

Post  BuRP on Tue Aug 11, 2015 3:32 pm

Better come for a braai or better still, invite me for one?
Can see the bike then too BRP smile
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