G36 gear timing...Piston stops half way...

[cjfield1129]

I've noticed that while shooting in semi, the piston will stop just about half way mid cycle. For example, I pull the trigger, BB exits barrel, cycle stops...yet when I removed the spring and spring guide (I have the Star G36 which has the quick spring change feature), the piston is always in mid cycle -meaning about half way back. I can actually see that the piston is engaged with the sector gear. This means that every time I pull the trigger again, the piston has extra load/stress from the spring. In addition, removing the spring after play is a must or the spring would otherwise compress and lower FPS. I am running CA Super torque up gears but the cut off lever post match up exactly as standard gears. I'm stuck. Does anyone have any thoughts on this issue? Has anyone experienced this issue?

[CDN_Stalker]

From what I know in semi the piston stops at various positions (unless i'm thinking full auto, been well over a year since I noticed in my MP5). Is your gun shooting fine otherwise?

[mcguyver]

How many anti-reversal stops are on the new CA bevel gear vs. the stock gear? This may have some part to play in where the piston stops, especially if you've altered the reduction ratio so that fewer turns of the bevel gear per cycle are occuring now.

[cjfield1129]

I have been experiencing FPS loss but that is not related to the gears -aside from that the gun shoots fine. The CA super torque up bevel has 4 stops. You make a good point about the ratio though. However, the same thing happened when I had standard ratio gears in. If the piston had just started to be pulled back, I could see that, but in my case, the piston is just about mid cycle. Weird huh?

[Mantelope]

It's just the momentum of the gears pulling the piston. In my experience I'd say it's entirely normal. Just so you know, there's no such thing as gear timing really... as long as your sector gear isn't engaging the piston when you reassemble, you really can't go wrong.

Some people prefer to set the bevel gear so it's engaging the anti-reversal latch when the sector gear's in a specific position, but it's really all a bit of hocus pocus; what works on one gun won't necessarily work on another.

[cjfield1129]

I understand the gear timing myth. It is equally difficult to believe though that the momentum of the gears is strong enough to pull a SP120 spring half way through the cycle. If it weren't for the spring change feature, I don't know what I would do. I wish more manufactures made some sort of anti reversal latch release to release spring/gear tension.

[Mantelope]

Could be something to do with the trigger, continuing to supply power for a split second after the trigger disconnect should be activated.

[cjfield1129]

Split second would be right. I have no clue how to fix this split of a split of a split second.

[The Saint]

What battery are you using? I recalling reading either here or on Arnie about rare incidences in which when certain AEG use a very powerful battery, a shot on semi will actually produce a two-round burst. Yours could be trying to produce a 1.5 round burst?

[Mantelope]

I heard Carl's P90 with 11.1V lithium batteries fires two BBs and almost a third on semi.

[cjfield1129]

I'm using a 9.6v 2000mah Nimh battery. I may try a lower voltage but I'm running super torque up gearset and don't want to lower the ROF if I don't have too. I don't even have a high speed setup. Very interesting indeed!