fork oil

putting some k tech front internal springs in for minitwin racing along with 15 weight fork oil what i would like to know is how much oil to put in in ml cheers

pick up the manual for the bike...should have the level of oil you need in the forks!

I used to run with 15w oil but although it helps prevent fork-dive it also masks the SV's basic suspension traits (which is why some peeps prefer it) and didn't offer the same level of precise (for an SV) rebound and damping that going back to 10w did.


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[Sid Squid]

Depends on which model of SV you have.

But you didn't say, so we don't know.

its va k4 model also would anyone knoe how much pull thru in mm at the top of the yoke we be a good start off

[northwind]

I don't know what the manual says... But I would say it's not a magic number. You can vary the oil level in the same way that you can vary oil viscosity, preload and springs to get different effects.

Not that I did

Ring K-Tech; to be honest you should probably be running 5w oil in there. Race damping is normally set up around 5w oil. The rationale being that 5w oil will thin less than 10w (or 15w) oil when hot, therefore you can keep more consistent damping properties over a bigger temp range.

As for level, book says:-

X, Y & K1 489cc (European models)
K2 478cc.

But the more accurate way is to measure the LEVEL

These are :-

X, Y & K1 104mm (European models)
K2 115mm

I don’t have the data for later models.

Again K-Tech should have all this info and might suggest their own levels (i.e. non stock levels to reduce/increase ‘air gap’ depended on their recommended base setup).

Originally Posted by Blue_SV650S

Ring K-Tech; to be honest you should probably be running 5w oil in there. Race damping is normally set up around 5w oil. The rationale being that 5w oil will thin less than 10w (or 15w) oil when hot, therefore you can keep more consistent damping properties over a bigger temp range.

As for level, book says:-

X, Y & K1 489cc (European models)
K2 478cc.

But the more accurate way is to measure the LEVEL

These are :-

X, Y & K1 104mm (European models)
K2 115mm

Again K-Tech should have all this info and might suggest their own levels (i.e. non stock levels to reduce/increase ‘air gap’ depended on their recommended base setup).

When the valving in the forks is efficient then 5w (or lower) is a good idea, but with something as crude as SV damper rods there would be next to no damping with 5W.

15W oil
130mm Air gap, forks fully compressed no springs
You can do it in the bike on paddock stand (but better with forks out),
Measure the airgap front and back of the fork leg (as oil level is at an angle) and 1/2 way between the difference between the two is your level

Originally Posted by Robw#70

When the valving in the forks is efficient then 5w (or lower) is a good idea, but with something as crude as SV damper rods there would be next to no damping with 5W.

15W oil
130mm Air gap, forks fully compressed no springs
You can do it in the bike on paddock stand (but better with forks out),
Measure the airgap front and back of the fork leg (as oil level is at an angle) and 1/2 way between the difference between the two is your level

Perhaps I misunderstood, but I thought he meant he was getting some K-Tech ‘cartridge’ internals … which basically replaces all stock internals. These I assume would be set up around 5w OIL, hence my post and reccomendation to ring K-Tech. If that is not what he meant, then that is ‘my bad’!!

Originally Posted by Blue_SV650S

Perhaps I misunderstood, but I thought he meant he was getting some K-Tech ‘cartridge’ internals … which basically replaces all stock internals. These I assume would be set up around 5w OIL, hence my post and reccomendation to ring K-Tech. If that is not what he meant, then that is ‘my bad’!!

Fitting of emulators requires heavier oil, not lighter