micromag retro "sweetspot" problem
A friend of mine just picked up a used retro valve. It came out of a micromag, I'm guessing, since is says micromag retro valve on the side.
We are running this valve with a LX kit in a classic PF/HR body with the standard carbon fiber grip frame. Air is supplied by a 68/3000 flatline set at 800 psi. LX kit looks to be using 1 shim with the #1 carrier, running either (tried both) the short or middle spring. I can get the thing to fire reliably, although I don't have a chrono, so I don't know the velocity. My point is, from my experience, the LX looks to be tuned properly.
Everything I've read about retro valves seem to indicate that a micromag uses a .765 on/off pin and, indeed, without measurement, the pin he received in his valve is longer than my confirmed stock .750 on/off pin. Knowing that .750 was the stock length for retros that are used in classic bodies, I put my .750 in and tried it out.
Here's my problem...With the .750 pin in and 800 psi input pressure, the thing sweetspots like mad! I have trouble getting single shots out of it. I find this to be odd. I tried the .765 pin and it doesn't sweetspot at all (good!), but just before it fires, theres a small leak from the bolt. If I have pressure on the trigger, the leak seems to happen just before the sear drops all the way. I haven't tried re-tunig the LX kit yet as I'm not completely sure that's where the problem lies. I'm thinking the .765 pin is a tad too long but I don't have access to anything that's slightly smaller. I've taken the body off the rail and cleaned everything. I thought there may be some dirt in there that was preventing a flush fit, causing tolerance issues. Still have the same problem tho.
Anybody else experience this type of problem? Anyone have any ideas on what I should look at to try and fix this thing?
Your help is greatly appreciated!
We are running this valve with a LX kit in a classic PF/HR body with the standard carbon fiber grip frame. Air is supplied by a 68/3000 flatline set at 800 psi. LX kit looks to be using 1 shim with the #1 carrier, running either (tried both) the short or middle spring. I can get the thing to fire reliably, although I don't have a chrono, so I don't know the velocity. My point is, from my experience, the LX looks to be tuned properly.
Everything I've read about retro valves seem to indicate that a micromag uses a .765 on/off pin and, indeed, without measurement, the pin he received in his valve is longer than my confirmed stock .750 on/off pin. Knowing that .750 was the stock length for retros that are used in classic bodies, I put my .750 in and tried it out.
Here's my problem...With the .750 pin in and 800 psi input pressure, the thing sweetspots like mad! I have trouble getting single shots out of it. I find this to be odd. I tried the .765 pin and it doesn't sweetspot at all (good!), but just before it fires, theres a small leak from the bolt. If I have pressure on the trigger, the leak seems to happen just before the sear drops all the way. I haven't tried re-tunig the LX kit yet as I'm not completely sure that's where the problem lies. I'm thinking the .765 pin is a tad too long but I don't have access to anything that's slightly smaller. I've taken the body off the rail and cleaned everything. I thought there may be some dirt in there that was preventing a flush fit, causing tolerance issues. Still have the same problem tho.
Anybody else experience this type of problem? Anyone have any ideas on what I should look at to try and fix this thing?
Your help is greatly appreciated!
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