A friend of mine has just bought a second hand FTP 900. When we were trying it we noticed a strong blast of air from underneath the action in the general area of the power adjuster and firing valve. Since there is a foam block covering where the air comes out that looks original, I'm guessing it is not a fault, but I know very little about this model. We can't get in touch with the original owner at the moment, and can't find any reference to this on the Web: can anyone explain what causes it please? Or is it a fault....? Thanks Alan
It's perfectly normal. It's a vent hole for the hammer, obvoisly if it didn't have a vent hole the hammer would build up pressure. Tony
Alan The firing valve runs in a small plastic bush when this is worn air can get by and out of the hole where the foam is when fired . A small amount of air coming out is Normal as some of this is from the hammer coming forward. The bush is only a couple of quid but check the valve stem is nice and smooth if not fit a new one at the same time. Russ
There will always be some air escapage down past the valve stem of a HP poppet valve. Walthers do it and it vents out of the saftey button . Steyrs do it and it fills the hammer and trigger chamber . This is highly probably where the black gunge comes from that gets on your hammers ( atomised lubricant ) some regs actually use it as part of their design ( walther , anschutz ,isp ) This was one of the first things i asked about on here when i got my walther . After a chat with the lovely Pete Dutton , i was satisfied that it was just how it is . I see some gun makers have tried to address the problem by fitting a seal to the stem ,but it seems counter intuitive to introduce drag into the system. I recall one rifle that was totally mucked up by having that seal on the stem
yep its not a fault all ftp900,s do this buddy so dont worry its fine, the foam block is there for this reason
