rschris Posted July 1, 2012 Share Posted July 1, 2012 Hoping someone can offer guidance but when my aeg has sat dormant for a few mins my first shot always drops short and lacks power to the point of a trickle. Anyone offer guidance? Link to comment Share on other sites More sharing options...
Saltyyy Posted July 1, 2012 Share Posted July 1, 2012 Maybe you're having air seal issues? Or do you have to give the magazine a bit of a pat to get it to work? Sounds like they're not feeding right or there's something wrong with the seal. Link to comment Share on other sites More sharing options...
rschris Posted July 1, 2012 Author Share Posted July 1, 2012 Maybe you're having air seal issues? Or do you have to give the magazine a bit of a pat to get it to work? Sounds like they're not feeding right or there's something wrong with the seal. They seem to load up fine, it's just that 1st shot. I'll have another look for air seal problems. Thanks mate Link to comment Share on other sites More sharing options...
Supporters Ian_Gere Posted July 2, 2012 Supporters Share Posted July 2, 2012 Yeah, I'd guess the seal between nozzle and hop bucking, or perhaps the buckig being too stiff and poking into the barrel obtrusively. It could also be the piston O-ring only working after it's been reseated by the piston being pulled back. Someone told me a good trick is to heat the O-ring and strretch it over the cylinder to make it fit more tightly inside. I haven't tried it yet so I can't add my yay or nay right now. You could try more grease or oil on the piston head though, which I can recommend, to make the O-ring more slippery so it doesn't get pulled tight towards either the front or rear of the cylinder. Link to comment Share on other sites More sharing options...
Supporters Airsoft-Ed Posted July 5, 2012 Supporters Share Posted July 5, 2012 It sounds like a hop issue to me. First shot is getting blocked by the hop but bashing it out of the way, following shots are ok because the hop was shifted by the first. If you leave it a while then the hop will drop back into the barrel and block it again, it's happened to me before with my L85. If it were something to do with the air seal it would drop short with every shot. Get the hop unit out and dismantle it, the spring that pushes the bucking down might be sitting wrong in the unit or something. Get the hop and barrel out and look down it, check for protrusions. Just because the hop wheel says hop is off, doesn't mean it is. Link to comment Share on other sites More sharing options...
rschris Posted July 5, 2012 Author Share Posted July 5, 2012 Hi Ed, Its an SRC mate, hope is a 1 unit solid piece including the rotating of hop and an off. The hop piece is built on to the wheel. Link to comment Share on other sites More sharing options...
Supporters Airsoft-Ed Posted July 5, 2012 Supporters Share Posted July 5, 2012 Hi Ed, Its an SRC mate, hope is a 1 unit solid piece including the rotating of hop and an off. The hop piece is built on to the wheel. I don't know enough about the intricacies of the SRC hop units to understand how that would deem me wrong, from my experience it sounded like a hop issue. Link to comment Share on other sites More sharing options...
Saltyyy Posted July 5, 2012 Share Posted July 5, 2012 Maybe the screw that's holding the hop wheel on is too loose which is causing it to drop slightly? Try tightening it up a little and see if that fixes it. If not try the spring etc. Link to comment Share on other sites More sharing options...
Hudson Posted July 5, 2012 Share Posted July 5, 2012 Possibly a Tappet/Gear issue? It's not cycling properly, so only getting half a cylinder's worth; hence the low range/power? Had similar issues with a couple of my guns; which I solved by either replacing the tappet plate or putting a delayer chip on the sector gear. Although with mine it was normally something like every fifth or sixth shot, not the first one. Link to comment Share on other sites More sharing options...
Supporters Ian_Gere Posted July 5, 2012 Supporters Share Posted July 5, 2012 When you say "drops short", Chris, how short are we talking about? Link to comment Share on other sites More sharing options...
Supporters Airsoft-Ed Posted July 6, 2012 Supporters Share Posted July 6, 2012 I think I'm now having the same issue with my L85, except the frequency of it isn't restricted to the first shot only, it happens on and off, a lot. For me it looks as though the hop is suddenly being turned completely off. It goes from flying straight for about 60m, to dropping short and landing at about 15m. In fact it's kind of like the hop swivels 180 degrees. I've no idea what it could be either, 'cos it certainly isn't the hop unit. I'm getting absolutely perfect compression in the cylinder, so it's not that either. My only thought is that maybe the gears are slipping occasionally at only half cycle... I've no idea why they would do that, but that seems to be what the effects show. The sound it makes suggests something similar as well, when it's shooting properly, it sounds normal. But on a shot when the range drops it sounds like the motor is tightened too far into the gearbox, it makes a slightly more whirry sound than normal. Having said that though, there's only minor wear on the piston and the gears all look new, looking into the magazine well also shows that the tappet plate is functioning perfectly, meaning the gears must be cycling properly, so I've literally no idea what the hell is wrong with it... But god I'd like to... It's truly typical of my luck for my gun to start behaving like this just as soon as I've got it finished externally Link to comment Share on other sites More sharing options...
Hudson Posted July 6, 2012 Share Posted July 6, 2012 That's exactly what happened with my 2 guns in my previous post. A new Tappet plate should fix it. Link to comment Share on other sites More sharing options...
Supporters Airsoft-Ed Posted July 6, 2012 Supporters Share Posted July 6, 2012 But the tappet plate isn't at fault, the gun is feeding perfectly, there's also no cracks or wear visible on it either. I'm adamant the tappet plate has nothing to do with it. Link to comment Share on other sites More sharing options...
Hudson Posted July 6, 2012 Share Posted July 6, 2012 Well Like I said; the symptoms are exactly the same as what happened with mine. I couldn't see any wear or damage to the tappet plate either; and it still fed 100% of the time, yet changing just the tappet plate fixed it... Link to comment Share on other sites More sharing options...
Supporters Airsoft-Ed Posted July 6, 2012 Supporters Share Posted July 6, 2012 I guess there can be times where airsoft related issues simply defy physics, I've had my fair share of those experiences... I'll have to look into getting a new tappet plate then. I'm selling my M16 to get cash to go to town on the internals of my L85, so I might as well spend some of the dosh on replacing the tappet plate. Think I might get a new piston as well whilst I'm at it. Might as well lol. I didn't mean to come across as snide or rude before, I meant no offence. The tappet plate just really didn't seem to be the culprit. Link to comment Share on other sites More sharing options...
Hudson Posted July 6, 2012 Share Posted July 6, 2012 It didn't with mine, either! It had me absolutely stumped for ages; On my Beta Spetsnaz I changed the barrel, the bucking (several times), the nub, the unit, the nozzle, the gears and none worked! Had the tappet plate suggested to me, and it worked straight off after that and never did it again... (Touchwood) Then when the same problem happened to my SR25 (Due to not able to get my hands on a tappet plate easily) I used one of the Sector gear delayers and that sorted it too! It may very well turn out to be something different but if the hop's not at fault, then it's definitely worth looking at; from my experience! Link to comment Share on other sites More sharing options...
Supporters Airsoft-Ed Posted July 9, 2012 Supporters Share Posted July 9, 2012 Managed to sort this out the other day - no new parts required. My piston head wasn't working right, my AOE was off slightly. My piston head has a little protrusion in the centre that enters the nozzle, which creates an air cushion at the from of the cylinder. So even though it's an aluminium piston head, it's perfectly cushioned and actually quite quiet. But the protrusion was hitting the edge of the nozzle instead of going into it, then the gears were grabbing the piston half way along, instead of at the end. The result was a horrible noise and a massive drop in compression. Altering the AOE slightly and set the gears up right and now it's fine. Link to comment Share on other sites More sharing options...
Supporters Ian_Gere Posted July 9, 2012 Supporters Share Posted July 9, 2012 Quick n00b question: what does AOE stand for? Link to comment Share on other sites More sharing options...
AF-UK Founding Member Deva Posted July 9, 2012 AF-UK Founding Member Share Posted July 9, 2012 Angle of Engagement. The gears have to be aligned correctly for the gearbox to function correctly. Link to comment Share on other sites More sharing options...
Supporters Airsoft-Ed Posted July 9, 2012 Supporters Share Posted July 9, 2012 Angle of engagement. It's to do with how the sector gear and the piston engage. The angle part is down to how far along it's rotation the sector gear meets the piston. My sector gear's first tooth is at about the 11 o'clock position of it's turn when it meets the first (or last, depends on how you think about it) tooth on my piston. You adjust the AOE by padding the front of the cylinder so that the piston sits further back, or by adding washers/spacers between the piston head and piston... Tbh I find that the AOE tends to just make itself work, I don't think it's all that important. But this piston head I've bought needs it to be spot on, otherwise it causes the piston head to hit the cylinder head wrong... ...I'll have to show you some time haha. Link to comment Share on other sites More sharing options...
Supporters Ian_Gere Posted July 9, 2012 Supporters Share Posted July 9, 2012 Aha! Well, it turns out that I have altered my AK's AOE without really considering the effect upon the sector gear engagement other than to just check that it did still work by hand before putting it all together. I just haven't got round to that part of my AK Saga on Skirmish's forum yet... I think you've hit on Chris' problem. In some form anyway... Link to comment Share on other sites More sharing options...
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