F#$k oil

**scracha** · 10th July 2006, 10:22

Took bike to matey to get progressive springs and new fork oil. What a difference. Old oil wasn't so much water as brown sludge....probably hadn't been done for 20 years. The old viffer isn't pogoing so bad now. Just need to get its ar$e end sorted and it'll keep up with the latest stuff...NOT.

Can't believe how much better the braking is too.

**jtzzr** · 11th July 2006, 19:07

the vfr`s deserve to be looked after ,had 1 up until a year ago , the cams went it is still sadly missed. Enjoy your new oil!

**cowpoos** · 11th July 2006, 19:16

would be even better if you put lineir springs in as apposed to progresive...the people that keep recommending progresive setup don't know what the fuck they talking about....

**Motig** · 11th July 2006, 19:36

What are lineir springs ? as opposed to progressive.

**Swoop** · 11th July 2006, 21:54

Originally Posted by scracha

The old viffer isn't pogoing so bad now. Just need to get its ar$e end sorted and it'll keep up with the latest stuff...NOT.

I know where you are coming from...

Gotta love a VFR though!!!

**Fooman** · 12th July 2006, 09:37

Originally Posted by Motig

What are lineir springs ? as opposed to progressive.

Simply, a spring* follows what is known as Hooke's Law:

F = kx

where F is the force needed to displace a spring with a spring constant of "k" a distance "x"

For truely linear springs, the spring constant remains the same no matter what displacement "x" is. Progressive springs have "k" as a function of "x".

For example, a linear spring with a constant of 1000 N/m will need a force of 1000N to displace it 1 m, 2000N to displace it 2 m and so on.

A progressive spring with a spring constant of 1000x N/m will need a force of 1000 N to displace it 1 m, but a force of 4000 N to displace it 2 m.

In summary, a progressive spring changes stiffness as it stretches or compresses.

FM

* A spring, of course, being anything solid that has a force applied to it, and is not undergoing plastic deformation.

**Motig** · 12th July 2006, 11:32

Um OK

**Ixion** · 12th July 2006, 11:58

Linear springs are the same springiness all the way along the spring. progessive springs get springier at one end (you make that end the top one, so the spring rate gets harder as the forks compress)