How much firk oil?

[WINJA]

eh? what are you on? it makes a hell of a difference. think of it like an extra spring if ya reduce the air gap you need more force to compress the less volume of air. its simple physics.

"this has been typed in caps in protest to winja having been castrated. poor bastard"

im glad someone else understands this

[GSVR]

im glad someone else understands this

Only issue is if you don't have enough gap then you hydraulic the seals.

Boyles law states that if you half the volume of a gas the pressure is doubled. So if you have 1 bar pressure in your forks if there was No Air Gap fully compressed the pressure at half travel would be 2 bar. And at 3/4 travel 4 bar.

Now considering the air gap is over 100mm. You do the math.

[GSVR]

Heres a graph from Ohlins for upside down forks which are far more sensitive than conventional forks to oil levels.

[WINJA]

only issue is if you don't have enough gap then you hydraulic the seals.

boyles law states that if you half the volume of a gas the pressure is doubled. so if you have 1 bar pressure in your forks if there was no air gap fully compressed the pressure at half travel would be 2 bar. and at 3/4 travel 4 bar.

now considering the air gap is over 100mm. you do the math.

hydraulicing the seals is not the only issue , that air gap effects performance including midcorner grip on the road

[WINJA]

heres a graph from ohlins for upside down forks which are far more sensitive than conventional forks to oil levels.

that graph says air spring , is it for calculating the effect of the air gap + the spring?

[GSVR]

Lets get back to the original question

"Can anyone tell me, how much fork oil per leg, in an 1987 FZR750."

And I stand by my original reply the the fork oil level will not make a huge difference as long as both legs are the same level and theres a reasonable air gap. On an older bike I'd be going for less oil rather than more.

That graph is refering to the spring effect in the air being compressed and I only posted it to show it has FA effect until your forks bottom out and then on bikes like mine and this old FXR probably almost none at all.

Page 59 of January Kiwirider 2005 explains just how complicated things can be to get your front wheel to comply with every ripple and bump in the road and most of it is concerned with shalf velocities and digressive rather than progressive compression curves but that is what modern cartridge shocks are all about right?.

[riffer]

My source is the Haynes FZR 600, 750, 1000 manual.

And I've tried a few different settings in the old bike (FZR750) and found most didn't work.

This setting does. I had the preload set reasonably high but I weigh more than Drew.

[Drew]

Is this because frosty had a bitch at you on the track day? Screw it man you dont need oil!

Sort of, I went for one of our thursday rides last week, and deano and myself couldn't get past Mikey! On the way home I began to wonder if I had my front end set up corectly? Answer, NO!!! There was fuck all fluid in either side, I must have under filled it last time I did the seals, cos there aint no leaks.
I went and got some more, and now I'm trying to get it right.

[VasalineWarrior]

Probably more to do with Mikey being a bloody lunatic rather than an affront to your overtaking abilities bro