Early this year my left fork seal started weeping oil after a ride so I took it in to have boths seals replaced and got new tires put on at the same time. When I got the bike back I noticed a bit of front end shimmey at high speed. I called the shop and they said to take the bike back and they will adjust the pinch bolts. It felt a little better after but there were still some shimmey around 90kph. After 1 1/2 month later (around 1200km on the odo) both of the seals started weeping oil. I called and had the bike back at the shop. They put in another set of seals and mentioned that the front tire presure was very low and thus caused the speed shimmey. The bike stop the shimmey but the new seals lasted only 2 weeks. Now both seals are puking oil; more so on the left side.
Now, here are the details. The bike now got 27,000 kms on it. The mechanic said the on the second replacement he could not find anything wrong with the previous set or the forks. He also mentioned that the chrome fork tube has some surface scratches and if the seals start leaking again the forks have will have to be replaced. I inspected the chrome tubes and can see some fine hairline scratches but nothing deep that could have caused premature seal failure. The scratches actually caused by the dirt which stuck to the oil leaking from the seals.
I commute daily to Vancouver with my ZX-7 and definitely do not do anything crazy. Forget about wheelies because I can't get the front end up. I am not sure if I should replace the seals myself or to shop for another set of forks.