The new springs should have come with a piece of PVC for making new spacers, and a piece of paper telling you how long to make them for your year and model.
For my 07 Speedy, it said to use the stock spacers.
Even though the springs are the same length, the PS springs will displace more oil due to the tight wind at one end. With that said, the instructions imply you keep the same oil level specified by your service manual unless it's less than some number, in which case it tells you what to do.
If the oil's clean you should be ok just swapping the springs. In which case you don't have to take the springs off the bike. You'll just need to remove the handle bars and be sure to lift the front wheel off the ground before unscrewing the cap. You'll loose a little oil on the old springs you pull, but it should be insignificant.
A lot of folks on here (myself included) went with a 10W/15W mix. Folks say 10W is too spongey, especially if you're a heavier rider.
Last edited by jackshakes; 06/08/2014 8:31 PM.
