help - 1st shot too fast

[peeeto]

fairly new tac-one, x-valve, L10 tuned:

when i first gas it up & take a shot over the chrono, it's over 300 fps (even seen it up to 320 fps). the next shots ~280 or less (~280 holding trigger then quick shot, ~270 otherwise...)

also happens after letting marker rest while gassed up in-between games.

this symptom just started happening about 2 weeks ago. i haven't changed anything about the setup, and it wasn't doing this before...

i don't recall seeing any info. regarding this type of behavior on the forum - anyone have some thoughts as to what's going on?

p.s. tank reg. is PureEnergy 'Reactor' shimmed to output ~1150 psi.

[athomas]

You have a bad or leaking regulator seat oring. It is letting high pressure air to seep past the regulator and into the front chamber.

[questionful]

http://www.airgun.com/debug.shtml#e2

[peeeto]

the valve (bought with the marker) is less than a year old - is this the type of thing covered by warranty?

[edit] i read the warranty: "Warranties do not cover wear items like bolts, sears, springs, spring packs, reg pistons, magnets, screws..." so i assume Reg. Seat wouldn't be covered either?


so, i hate to have to ask, but the Airgun Store is not very clear:

1) in the X-Valve Exploded (http://www.automags.org/forums/showthread.php?t=194223) thread, the part i probably need to replace is labeled #31 , right?

2) i know that 3 Reg. Seat O-rings come in the X-Valve O-Ring Replacement Kit (http://store.airgun.com/index.cfm?fuseaction=catalog.prodInfo&productID=458&categoryID=23), but which one of these parts kits is the proper one (in case someone wanted to order them separately)?:

AGD Part#000779 (http://store.airgun.com/index.cfm?fuseaction=catalog.prodInfo&productID=125&categoryID=23); or
AGD Part#000844 (http://store.airgun.com/index.cfm?fuseaction=catalog.prodInfo&productID=116&categoryID=23)

[peeeto]

another question:

when replacing, just use the oil to lube, or is this a location for grease?

even if grease is not to be used here, what type of grease is recommended for the reg. springs?

thanks again for all your help

[athomas]

For lube, use a good quality synthetic air tool oil.

For grease, it isn't as important as it is only used to coat the spring to prevent rusting.

I wouldn't worry about warrantee just yet. If you have a leak, just replace the bad oring. Its cheaper than sending the valve back for warrantee. You should have a spare oring kit at all times anyway.

You should have this kit; http://store.airgun.com/index.cfm?fuseaction=catalog.prodInfo&productID=458&categoryID=23

[peeeto]

cool - thanks for confirming. i did order an o-ring kit on the 22nd (should have bought one with the marker but didn't think about it...)

thanks again for your help...

[angrysasquatch]

I have the opposite problem- my velocity is too low for the first shot. Not like 30 fps slower (as is normal for an X-valve), really slow. It goes about 5 feet. The next few shots are just fine, and will be fine until I don't shoot for ~5 minutes. My gun is a X-valved RT pro (LX, ULT) if that helps. Thanks a lot.

[athomas]

I have the opposite problem- my velocity is too low for the first shot. Not like 30 fps slower (as is normal for an X-valve), really slow. It goes about 5 feet. The next few shots are just fine, and will be fine until I don't shoot for ~5 minutes. My gun is a X-valved RT pro (LX, ULT) if that helps. Thanks a lot.Sounds like a bolt stick issue. Remove the level 10 shims and use the largest carrier that doesn't leak. If that doesn't work, give the valve a good cleaning.

[peeeto]

Sounds like a bolt stick issue. Remove the level 10 shims and use the largest carrier that doesn't leak. If that doesn't work, give the valve a good cleaning.

yes, sounds like it to me too - i had the same symptoms when i first got my marker. i "cured" mine by loosening the field strip bolt until it was just finger tight then ~1/4 more turn (i had it on WAY too tight at first).

[angrysasquatch]

Alright, thanks guys I'll try that next time I can get my hands on some air. :cheers: