610 Husky. I think my problem was that I must not have been at TDC. Also, the specs are a little iffy on them. The manual says to set them at 0.002, no +/-. But others say they aren't sure, cause the manual also says something about valve play to .012. The only explanation I've gotten from others is that something is being lost in the translation from Italian to English (the manual is in Italian as well). Then to top it off, getting to the valves is a PITA. Even once you have the tank, radiators, overflow tank, and carb off, it's still tough to get the feeler gauge in to the valves.What bike are you trying to adjust the valves one?
I also had my bike on a car hydraulic floor jack so I could spin the rear wheel to try and find TDC. Needless to say, it wasn't very stable and kept about tipping over, so when I though I was close, I just went for it. I should have been more patient, gotten one of my brothers over there to help, and double check to make sure I was at TDC.