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Old 2nd October 2016, 07:20 PM
Bellerophon Bellerophon is offline
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Originally Posted by Nick G View Post
Put your finger over the trans port and pull the piston rearwards to its full travel release and it should travel back to its forward position, or do it the other way round , ie finger on trans port push piston forward and immerse in water , look for air escaping.

Just done the non water immersed test and the piston returns to its original position every time.
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Old 3rd October 2016, 11:05 AM
hmangphilly hmangphilly is offline
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Originally Posted by kieran turner View Post
Thanks that makes for a good read with some interesting points.

I've been shooting mine today and it doesn't seem to be particularly hold sensitive, no POI movement between stances and it can shot off of the floor (HFT prone position). I have only been shooting at 27y but thus far it shoots ok. However in my opinion I could do with an additional 20-25fps.

I'm going to put some more pellets through it to about the 750 pellet mark and then re-chrono. I have emailed Steve Pope with my findings. In theory it would add up that the piston seal is too tight within the compression chamber as the washers make no difference to the muzzle velocity.

Just out of curiosity what lubricant are you using around the piston seal, I've only dabbed the tiniest amount of Molly grease around the outside edge of the seal.
LUBE .......?........blimey , whole subject all on it's own .

Everybody has a favourite, ranging from nothing at all , to copperslip ,to some very exotic products and home made concoctions ......

it's very subjective , and easy to get side tracked ,dazzled and seduced .

I would suggest in your case , ask steve pope's advice as to what he knows to work , how much and where with his seals ........
feel free to let us know ......

after that ,........
bearing in mind that i may well know booger all about nothing ............

...i've been using the stoopidly expensive krytox or sometimes dry moly
...i know that nick g supplies a lube with his kits so, worth a look / ask
....walther supply lubes with their piston kits a teeny bit of that if you fancy a smidge

and then this is a good read from a man who knows stuff......yeah its blagged from another forum .....

this subject could easily develop into a dedicated thread ......
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Old 3rd October 2016, 07:42 PM
Bellerophon Bellerophon is offline
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Default Update

I spoke with Steve Pope earlier today and all I can say is what a tremendously helpful guy and I couldn't recommend him enough.

Anyway we had a chat and fired some ideas about and after running through a few things it was highly likely that the rifle was over sprung. So basically there must be an additional washer/top hat still in the piston from a previous owners mods. After Steve gave me the internal measurements from an in tact Mk1 piston I got home and measured the piston from my rifle, 4mm difference.

Long story short after some persuasion I managed to release an additional nylon washer approx 3.8mm in width from inside the piston. I reassembled the rifle without any washers in front of the top hat and fired through the chrono. 762fps with 8.44's. Over the 20 shot string I put through the chrono this evening I had a low reading of 759fps and a high reading of 771fps which I don't think is too shabby seen as I'm assuming there will another running in period.

So as it stands the issue looks resolved however another spanner may well appear because well, it's an airgun!

Thanks for all the input gents and fingers crossed other commitments don't stop me from being able to shoot the damn thing.



Last edited by Bellerophon; 3rd October 2016 at 07:51 PM.
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Old 3rd October 2016, 07:45 PM
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RobF RobF is offline
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Nice work. Steve Pope is every so knowledgable and helpful. Glad you got that sorted.
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