Wasabi Posted July 10, 2016 Report Share Posted July 10, 2016 Many years ago I started shooting with a .22 BSA Supersport which was traded against my first 12 bore about 17 years ago. Anyway I had a fit of nostalgia recently and found a rather dirty but identical gun with the same scope I had for a not bad price. Over the gunshop chrono it did 10.1 ft lbs over 5 shots with AA field pellets. I have totally stripped, cleaned and re greased the gun apart from the spring and piston. The barrel was full of crud and now shines inside beautifully! Today I took it to the range and was getting some decent groups at 25 yards when I did my bit. The gun does seem a bit harsh on the firing cycle. What can I do to tune it up? I'm thinking new spring, polish the piston etc, new seals and then re grease etc. What rlse could be done to smooth things out? The gun looks like it has a spring guide inside the mainspring. Are these a standard item on a 1990's Birmingham Supersport or does this suggest it's already been tinkered with? Quote Link to comment Share on other sites More sharing options...
Daveo26 Posted July 10, 2016 Report Share Posted July 10, 2016 The best thing for a gun if this type is a well fitted delin Spring guide and possibly a top hat and a sensible relube. A gun that's had plenty of use is unlikly to change much from polishing, The bits that rub a probably already smooth. I order delin bar from eBay and get my mate to turn up a guide on his lathe. It made a massive difference to an old Wembley Vulcan I did and it cost a few quid vs a proper tuning kit which are about £50+ Worst thing about bsas is that trigge, Iv never got on with them. Good luck with it mate Quote Link to comment Share on other sites More sharing options...
Wasabi Posted July 10, 2016 Author Report Share Posted July 10, 2016 Thanks! Can you do anything with the trigger? Quote Link to comment Share on other sites More sharing options...
Daveo26 Posted July 10, 2016 Report Share Posted July 10, 2016 (edited) You could probably polish the Sears but it's the nature of the trigger being an old school single stage jobby. No doubt someone will be along to say the supersport trigger is the best unit ever fitted to a gun. I'm just not a fan. If you are getting good groups with it concentrate on Improving the firing cycle. I like black Molly grease but sparingly Does the gun have normal piston seal or is it the oring setup? Go with what you said, Spring and seals. I would try and get a Spring guide made to fit the Spring, that will make the single biggest diffence Imo Edited July 10, 2016 by Daveo26 Quote Link to comment Share on other sites More sharing options...
oldypigeonpopper Posted July 10, 2016 Report Share Posted July 10, 2016 hello, if you go on uk airgun forum send a PM to tinbum he makes spring guides and top hats for most spring airguns, not expensive. cheers Quote Link to comment Share on other sites More sharing options...
Wasabi Posted July 10, 2016 Author Report Share Posted July 10, 2016 Think I'll leave the trigger alone. No idea about the piston as I've not had the spring out. It already has a metal guide up the inside of the mainspring, you can see it through the coking slot. Is this standard? Quote Link to comment Share on other sites More sharing options...
Daveo26 Posted July 10, 2016 Report Share Posted July 10, 2016 http://www.airrifleshop.co.uk/AirgunSpares/AS_SSTK_BSA.htm Quote Link to comment Share on other sites More sharing options...
Wasabi Posted July 10, 2016 Author Report Share Posted July 10, 2016 Thanks! What's a top hat? Quote Link to comment Share on other sites More sharing options...
Daveo26 Posted July 10, 2016 Report Share Posted July 10, 2016 (edited) Yes it's probably standard. They serve a purpose but can be improved upon The top hat... It goes on the opposite end of the Spring to the guide fits inside the piston It allows the Spring to rotate more freely and does away with the metal to metal contact of the Spring and piston. Making things nicer... Edited July 10, 2016 by Daveo26 Quote Link to comment Share on other sites More sharing options...
oldypigeonpopper Posted July 10, 2016 Report Share Posted July 10, 2016 hello, if you go on uk airgun forum send a PM to tinbum he makes spring guides and top hats for most spring airguns, not expensive. cheers should get with fitting instructions Quote Link to comment Share on other sites More sharing options...
s4s Posted July 17, 2016 Report Share Posted July 17, 2016 Best tune I've done on bsa supersport is as follows. Rear steel standard guide polished in and out. Cocking slot de bured polished. In piston and cylinder. Piston weight added chambers sell these or you could use a pound coin faces smoothed and polished.titan no 1 spring or o m spring polished ends. Supersport should already have spring sleeve fitted. Use hw 35/80 transfer seal for better seal. Redbeck shooting supplies were cheapest for seals springs last I looked. Best pellets I found were rws hobbies in .22accurate as he'll up to 100ft. Rws superdomes great too.hobbies really sing. As for trigger spray it out with brake cleaner and either use a oil or 're grease with Molly grease on cotton ear budds. Both my supersport are stunningly accurate and have silky action I actually love the supersport very underrated. Best spring is a v mach spring as are v Mach main seal however o m black seals are very robust If you do nothing else try rws hobbies Quote Link to comment Share on other sites More sharing options...
Bully100 Posted July 24, 2016 Report Share Posted July 24, 2016 Morning Gents Ive recently bought myself a Bsa Supersport. I decided to uprate my main spring to a square section as the old standard one was at three different angles ie ### .On reassembly I found the rifle would not cock fully ie sear pin would not engage into piston .Thought at first it might be the trigger not being assembled correctly.But after studying explosive diagrams and rebuilding trigger several time I am now confident it is rebuilt correctly. Does the trigger sensitivity screw need adjusting to counter the extra holding tension of the new spring ? Or is the extra length of the new spring restricting piston movement and not letting sear engage ? Any advice would be greatly appreciated apart from should of taken it to a gun smith Quote Link to comment Share on other sites More sharing options...
Stonepark Posted July 24, 2016 Report Share Posted July 24, 2016 Morning Gents Ive recently bought myself a Bsa Supersport. I decided to uprate my main spring to a square section as the old standard one was at three different angles ie ### .On reassembly I found the rifle would not cock fully ie sear pin would not engage into piston .Thought at first it might be the trigger not being assembled correctly.But after studying explosive diagrams and rebuilding trigger several time I am now confident it is rebuilt correctly. Does the trigger sensitivity screw need adjusting to counter the extra holding tension of the new spring ? Or is the extra length of the new spring restricting piston movement and not letting sear engage ? Any advice would be greatly appreciated apart from should of taken it to a gun smith Sounds like your spring is too long and upon compression is 'binding' (coils completely touching) before it can engage the sear. Take back apart and check with old spring, if it cocks, then cut new spring and face to match the length (uncompressed) of the old spring. Quote Link to comment Share on other sites More sharing options...
Bully100 Posted July 24, 2016 Report Share Posted July 24, 2016 Just managed to get hold of Alllen keys small enough to adjust trigger if no joy I will trim coils off new spring to match standard Spring length as you suggested .Il let you know how I get on . I really appreciate the advice cheers . The people who make these square section springs don't have any technical department or website for information . Quote Link to comment Share on other sites More sharing options...
Bully100 Posted July 24, 2016 Report Share Posted July 24, 2016 Sounds like your spring is too long and upon compression is 'binding' (coils completely touching) before it can engage the sear. Take back apart and check with old spring, if it cocks, then cut new spring and face to match the length (uncompressed) of the old spring. I tried trigger tensioning no joy . So I replaced standard spring and rifle will still not cock. could it be gun grease on sear and piston ? I have tension on the trigger but I'm worried I might not have got the sear spring located correctly. Should there be tension on the sear from the spring before cocking ? Quote Link to comment Share on other sites More sharing options...
Stonepark Posted July 24, 2016 Report Share Posted July 24, 2016 When you took the trigger apart, did it go back in the right order, if you have the y spring in the wrong place it will not allow the gun to cock. http://i1188.photobucket.com/albums/z406/st0nepark/Airgun/XLTriggerRotated.jpg http://i1188.photobucket.com/albums/z406/st0nepark/Airgun/images.jpg Quote Link to comment Share on other sites More sharing options...
Bully100 Posted July 27, 2016 Report Share Posted July 27, 2016 Hi bud I've got both springs and sear sear sat on the right trigger pins . But I can't work out if the sear y Spring sits on top or under the sear on the sear pin . Plus should the top of the y Spring sit over or under the trigger tensioning Spring ? I took it apart after watching a video on the meteor strip down didn't realise that the meteor only had two trigger pins and is very basic . I've even put the standard Spring back in but rifle still won't cock . Quote Link to comment Share on other sites More sharing options...
Paul G Posted July 23, 2018 Report Share Posted July 23, 2018 Hi I recently stripped the trigger of my Supersport. I didn't intend to, but in the process of lubing the spring etc I ended up with the piston in the rear position and needed to strip the trigger to release it (although reading the comments above I see that there's a screwdriver trick I could have used). Anyway, yes the Supersport trigger is more complex than a Meteor trigger (and it operates all the better for it). There is a key stage in the reassembly where the clothes-peg style spring #41 on the exploded diagram below needs to be compressed so that its short end can be tucked under a pin. The pin also holds, through a pair of eyes, the v-shaped spring that's next in the re-assembly (part #43). Getting this pin into place was a real swine and I gave up a couple of times, Eventually I succeeded, holding the gun upside down in a workmate squeezed as tightly as I dared, compressing the short end of the clothes-peg spring with a small screwdriver and eventually getting the pin into place. After that, the L-shaped piece (#42) needs to be put in place. Although it looks like it will fit into place without removing the pin above it (this is the fattest pin, possibly part #40 and shown in situ in my second image) I found that not to be the case, and once that was removed it all went back together successfully. The finished job looks quite sloppy - there are parts that seem to have little lateral stability - but go with it and it'll be fine when it's all back under tension. I have not described this very well - but hopefully the photos will help. Unlike the Meteor, for instance, I found very little on the web in terms of maintenance guides for the Supersport. The good news for me is that following the strip and the mainspring clean and re-grease, the rifle has lost the twang it had acquired and is now super smooth using just the standard (polished) spring and guides. Paul Quote Link to comment Share on other sites More sharing options...
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