im only 5'5" with short legs. i can bounce my back left to right and right to left with nothing more than my toes on the ground. onc eyou find your balance it is cake. i typically have my right foot on the peg and brake, while my left foot sits flat footed as i lean the bike over. depends on if im on a hill, crap road, or whatever.

 

Can you raise the rear by adjusting the spring with the preload adjustment tool?

 

no.

the rear suspension is fixed. that means it is bolted at 2 points and that distance when the shock is unloaded will always remain the same unless the shock is compressed.

the adjustment of the spring is only related to making the suspension loose or stiff. there is no height adjustment relative to this change. height adjustment can only be made through overall length of the shock or changing certain rear suspension items such as the dogbone or relocating the top shock mount.

87-90 cbr's do not have a clevis mount. so overall height adjustment cannot be made using shims or washers. another way would be to get an aftermarket shock with height adjustment. most aftermarket dogbones i've seen usually lower the rear, not raise it.

i have an idea of how i could make the rear height adjustable but i still need to test out this theory. this is more or less an outstanding issue i've been trying to resolve for the last several months for the use of a f3 swingarm conversion.