It isn't normal, but it happens. I had one that leaked, replaced it with a bolt, and that leaked. I finally broke down and spent fifteen bucks on a new decompression button and solved the problem. Now I have one on a different saw that pops up too soon. I'll start fooling with it after this long, wood cutting weekend. If it is leaking around the threads, your best bet is to replace it. I think. Wiser men than me might know better.