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Low BB Shot Velosity

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typhoon93rm View Drop Down
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Joined: May-28-2019
Location: Rochester Hills
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    Posted: June-13-2019 at 7:36pm
I'd like to thank everyone who had input for helping me find the correct trigger for my model 90.  It turns out that this was a trigger used in several Daisy models.  I did get one from eBay with the spring and successfully installed it in my gun.  After adding some oil to the barrel (the gun has not been fired in 52 years) I went outside to fire the gun. The BB could barely travel ten feet! Do I need to buy a new spring & seals?  If so, is there a kit assembly that's sold? Sorry, but I am new at this and still learning about the mechanics of a BB gun.
Rick
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BSAGuy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BSAGuy Quote  Post ReplyReply Direct Link To This Post Posted: June-13-2019 at 10:06pm
Hi Rick,

Congrats on the trigger install.  I'd bet that your plunger seal is stuck fast to your barrel seal.  This happens when guns are stored for many years or decades.  When you cock your gun, both seals retract because they are stuck together.

When this happens, the only power for the BB is the striking of the air tube which gives it a "pool cue" hit only.  There is no compressed air to add to the BB velocity.

I restored my childhood Model 99 (Christmas, 1962) back in February.  I had the same issue.  The gun cocked and sounded OK, but had zero power.  It had sat in my father's closet for probably 49-50 years like yours.

Read the explanation at the following link and my comments will make sense: https://www.pyramydair.com/article/A_look_inside_the_BB_gun_powerplant_August_2009/64

The fix is complete disassembly, a good cleaning, and installation of new seals.  If you are the least little bit handy, this is easy to do (well at least not super hard) and it is very rewarding to get a childhood companion back in fine fettle.

I have some seal kits for sale.  Email me at cmiller5atcarolinadotrrdotcom and we can get together.  


The 99 trigger is different from yours, but that is the only part.  You can use the Model 99 disassembly instructions to disassemble your Model 90.

Shoot me an email! 
Be Prepared
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cobalt327 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cobalt327 Quote  Post ReplyReply Direct Link To This Post Posted: June-14-2019 at 6:54am
Might want to take a close look at your spring while you're in there replacing the barrel seal and piston, too. They can get distorted. Photos of a bad spring and info on getting a new spring from Daisy is HERE.

ETA- BSAguy, I don't see the manual link in your post? 

The manual is HERE. It's for the 99 but is basically the same except the model 99 shot tube that's shown in the manual is the spring fed type like used in the No. 25 and others, so is different than the gravity feed type shot tube used in the model 90. And the 99 uses a trigger 'module' instead of the simpler stamped trigger in the 90. Neither of these differences will have any bearing on the disassembly you will be doing to reseal your gun. Next post down from the 99 manual is another more generic Daisy manual that shows the gravity feed type shot tube as well as the simple stamped steel trigger like used in the 90 and many other Daisys.
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jackdog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jackdog Quote  Post ReplyReply Direct Link To This Post Posted: June-14-2019 at 10:55pm
I agree with BSAGUY as to probable cause for the low velocity.. In many of the 1894's this is very likely the cause for low power... The other cause for this is the tube on the end of the plunger head is rusted off.  But I would bet the abuttment seal and plunger head seals are stuck together as BSAGUY explained... If there is an "oil here" hole in the barrel you can sometimes see this as you cock the gun and if lucky break them apart with a sharp implement through the hole,,,   Oil then shoot many times
(with no ammo) to seal it up again... 
Worth looking at. 
Aim Straight
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typhoon93rm View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote typhoon93rm Quote  Post ReplyReply Direct Link To This Post Posted: June-21-2019 at 9:38am
Thanks guys, for all your input!  I have ventured forward and removed the powerplant from my model 90.  You guys were right - the abutment seal and the plunger head seal were stuck together!!!  The seals and felt wiping pad all practically look like new, but I suppose it may be a good idea to install new ones at this point.

To BSA Guy - I tried to email you back regarding you new seal kits but have been unsuccessful at cmiller5atcarolinadotrrdotcom. Is this address correct?

Also, I can see where it will definitely be a challenge to push the spring back to reinstall the spring anchor without the Daisy Plunger Fork Tool.   Ermm 
Rick
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BSAGuy View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BSAGuy Quote  Post ReplyReply Direct Link To This Post Posted: June-21-2019 at 11:14am
Hi Rick,

Glad you got your gun apart.  Yes, the email I listed is correct, but you have to substitute @ for "at" and periods (or dots) for "dot".  I list it all in words to avoid spammers.

You can also click on my user name, view my profile, and get my work email for a contact point.

If you contact me, I can send you several ideas for a homemade, field expedient plunger tool that I have collected from this site and other places on the internet.
Be Prepared
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