Originally Posted by paulpalmer
Thanks
I'm sure it's working but I'm wondering if someone has been messing with the sleeves in the past. I'll take a look.
a mate of mine had a similar problem and it turned out that someone had removed the 2 plastic sleeves from inside the amal valve! i would say that if yours has been stage 3 or something before and then it was put back to standard before it was sold it could be a similar problem.