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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).
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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