Reply With QuoteHow tight is the piston seal in the cylinder? It could bed in and become more efficient. Otherwise, maybe a power washer behind the spring?Originally Posted by Geetee
Registered User
Hi all,I have a tx200, I replaced piston seal, breech seals. I took 1 coil off new spring and compressed 1 coil.Am only getting 9.5ftlb,would like around 11.5 ftlb any ideas guys
Boingerati
How tight is the piston seal in the cylinder? It could bed in and become more efficient. Otherwise, maybe a power washer behind the spring?
Registered User
I tried 2 washers on spring guide,gun wouldn't cock or engage trigger so removed them.piston seal is quite loose
Boingerati
If the seals a bit loose, you could lose power there. For interest; why remove a coil and collapse a coil before getting to 9.5ft/lb? It sounds like the spring in its' original guise would have met your requirements.
Registered User
Hi,ì used an airarms Pro tuning kit,Does seem constant over chrono.
Cooee! Chase me you naughty boys!
Did you not try everything before you took the coil off ?
Master Debater
Registered User
Thanks for replying guys,have ordered replacement spring
Zebedee
Which version of the TX is it?
Did you measure the output before fitting the spring?
As the chaps have said, it may have been wise to try the rifle before reducing the spring down. But that's history now. If you have to wait a while for the new spring it might be worth adding some preload at the front end so as not to promote sear latching issues.
As CapitalBee has said, depending on how loose the piston seal fit is, this might be causing issues? If it is slightly loose at room temp and you are then shooting outdoors in these temps, the seal fit will be even looser as the seal contracts, reducing compression. If this was the case, you could try and re-chrono in a warm(er) setting.
What calibre and what pellets are you using?
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