Brand new KWA SR12 not a week old.
What the hell could have caused that...?
Any suggestions for a new piston to replace it?
superchrisguy wrote:How many times have you fired it? What strength spring?
logical wrote:Harsh pick up tooth force, terribly shimmed gears, bad AoE. Sadly KWA's have odd gearbox specs so you are going to need either a KWA piston or a Prometheus piston. To further prevent this problem, adjust your AoE, lighten the piston assembly and replace the aluminum piston head with a ported one. Make sure your gears are spinning smoothly without any gear whine.
Let's think about it, if you have gears that are improperly meshing, the sector gear can contact the piston off the center of the teeth, and with improper engagement (side to side, not AoE) the tooth will break off easily. With that said, YES gears can be the cause of piston stripping.Rhino wrote:logical wrote:Harsh pick up tooth force, terribly shimmed gears, bad AoE. Sadly KWA's have odd gearbox specs so you are going to need either a KWA piston or a Prometheus piston. To further prevent this problem, adjust your AoE, lighten the piston assembly and replace the aluminum piston head with a ported one. Make sure your gears are spinning smoothly without any gear whine.
OMG! KWA uses shimless gears and poorly shimmed gears has nothing to do with a piston breaking! No shims are needed in a KWA! I also havent seen any problems with other name brand pistons in a KWA, so your wrong there. Ive used.... Deepfire, SHS, AIM, modify quantum, element, modify ultra, etc. My guess is a lemon... KWA would have warrantied it also. I ran my stock piston with a M170, magnum motor and 50c 5000 mah 11.1 lipo (23+ RPS and 550+ fps) shooting semi AND full auto and it lasted about 25k rounds which isn't bad for the amount of stress I put it through.
You're 100% right but KWA's have always come like that and lasted for thousands of rounds on other peoples guns. I'm thinking it's just a faulty piston.-a|ex wrote:i've seen a number of AOE cracks. that's one of them. you can tell by how the chunk cracked off. it was an upward force.