TX200 - Mk2 piston into a Mk3?

[prosport.177]

If no top hat in piston, the piston should weigh about 230,235 g as long as its not been lightened..
pistons will have about 107-110mm of spring room measured from rear piston skirt, the bearing end down inside of piston to back face of the front of piston..
I have put mk2 piston in mk3 comp tube running mk2 spring with no problems..
Hope this helps

[imorik]

Joust a thought, compare end of latch rods to see if any difference. Also check if latch rod runs true, some can be off by quite a bit. Both will make it difficult cocking trigger without a good tug.

[Weasle]

Many thanks to you all.

I will check out the latch rod profile....

I will also source a Mk 2 spring from elsewhere and start again - I already have a Mk2 top hat and spring guide soused from the nice Mr Bum.

I've built the Mk2 piston using one of Mr Popes seals...which have worked for me on all of my other AA Tx/ProSport derivatives.

Cheers

Steve

[NickG]

Many thanks to you all.

I will check out the latch rod profile....

I will also source a Mk 2 spring from elsewhere and start again - I already have a Mk2 top hat and spring guide soused from the nice Mr Bum.

I've built the Mk2 piston using one of Mr Popes seals...which have worked for me on all of my other AA Tx/ProSport derivatives.

Cheers

Steve

If you have after market guides put the top hat and guide on the piston rod without the spring then push it into your trigger block to make sure it latches , chances are your guide is too long.

[Weasle]

If you have after market guides put the top hat and guide on the piston rod without the spring then push it into your trigger block to make sure it latches , chances are your guide is too long.

Many thanks.

I have unfortunately already tried.......

Cheers

Steve

[NickG]

Many thanks.

I have unfortunately already tried.......

Cheers

Steve

does the trigger latch outside of the gun when tried as i suggested ?

[Weasle]

does the trigger latch outside of the gun when tried as i suggested ?

Many thanks - Ill give that a try.

Cheers

Steve

[Shed tuner]

if it's not the length of the guides it may well be the centralisation of the rod in the piston - is it centred correctly ? Also is the rear guide "brim" OD the full size of the main tube of the gun, thereby preventing it from moving off centre ? Also look at the trigger block - does the lead into the hole in the trigger block through which the piston rod passes show any signs of being hit / metal contact ?

[NickG]

if it's not the length of the guides it may well be the centralisation of the rod in the piston - is it centred correctly ? Also is the rear guide "brim" OD the full size of the main tube of the gun, thereby preventing it from moving off centre ? Also look at the trigger block - does the lead into the hole in the trigger block through which the piston rod passes show any signs of being hit / metal contact ?

Would have to be a mile out to prevent cocking

also check any "power washers"on the rear guide are of the correct diameter to go inside the bore of the piston .

[Weasle]

if it's not the length of the guides it may well be the centralisation of the rod in the piston - is it centred correctly ? Also is the rear guide "brim" OD the full size of the main tube of the gun, thereby preventing it from moving off centre ? Also look at the trigger block - does the lead into the hole in the trigger block through which the piston rod passes show any signs of being hit / metal contact ?

The Brim OD of the guide is a V snug fit in the main tube - in fact it was oversized as supplied, and I reduced the Dia to give me a snug fit - thinking I didn't want any lateral movement.

I haven't noticed any witness marks on the trigger block - however I will re-strip and investigate.

Many thanks

Steve

[Weasle]

If no top hat in piston, the piston should weigh about 230,235 g as long as its not been lightened..
pistons will have about 107-110mm of spring room measured from rear piston skirt, the bearing end down inside of piston to back face of the front of piston..
I have put mk2 piston in mk3 comp tube running mk2 spring with no problems..
Hope this helps

Many Thanks