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High end needle O-ring bad after only one gallon.

High end needle O-ring bad after only one gallon.

Old 06-08-2014, 01:42 PM
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Default High end needle O-ring bad after only one gallon.

Or maybe I'm a little over a gallon, but somewhere around there.

I noticed Friday, the high end needle was really loose but only about 2 1/2 turns out and when I started it, a little bit of fuel covered the top and filled in the little slot for the screw driver, but just a little. The leaking stopped and the needle adj feels normal again but it collected a little bit of dirt all on top of it.

It's a Hyper 21 8 port.

No big deal I guess but does anybody else see these go bad that fast?

I'm ordering this Monday but thinking maybe I should stock up (I mean, like a lot) on these and for other engines.
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Old 06-08-2014, 01:55 PM
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When it happens to me I always slice a piece of a fueltube on the right size to use it as an O-ring.
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Old 06-22-2014, 04:12 PM
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Originally Posted by Roelof View Post
When it happens to me I always slice a piece of a fueltube on the right size to use it as an O-ring.
I've been thinking about this since I read your response last week. I'm looking for an unlimited supply of O-rings for all my engines.

When you do this, is it easy to get back in?

I would imagine fuel line probably lasts a little longer than the oem part. I just can't see how easy it would be to put it back in without it rolling off or being a b*tch to keep it in the right spot.

I guess I'll have to try this and see what happens.
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Old 06-23-2014, 02:05 AM
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a tiny drop of blue loctite generally works for me
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Old 06-23-2014, 02:18 AM
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Yes, fueltube will work. 5 and 5.5mm tube will work but be sure the slice is as width as the gap in the needel then it will fit perfect.

Locktide I would not do.
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Old 06-23-2014, 03:21 AM
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I had one that would turn on it's own in tell engine got warmed some. Atleast when it did always went rich
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Old 06-23-2014, 11:49 AM
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Originally Posted by pdmustgt View Post
I had one that would turn on it's own in tell engine got warmed some. Atleast when it did always went rich
Ya, mine was in there really loose until it got warm and then felt tighter/like new.

Maybe it was also adjusting itself until warm, I don't know.

I can understand why it would richen instead of leaning out. Vibration tends to make things loosen up and fall apart more than make things tighten up. There's also some internal pressure that might help that along as well.
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Old 06-23-2014, 03:31 PM
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Originally Posted by mercfocus View Post
Ya, mine was in there really loose until it got warm and then felt tighter/like new.

Maybe it was also adjusting itself until warm, I don't know.

I can understand why it would richen instead of leaning out. Vibration tends to make things loosen up and fall apart more than make things tighten up. There's also some internal pressure that might help that along as well.
Change the o-rings - its cheap... No Loctite on your engine needles.
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Old 06-23-2014, 04:12 PM
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Originally Posted by token View Post
Change the o-rings - its cheap... No Loctite on your engine needles.

I had absolutely no intention of using Loctite on my engine needles.

I've had to buy the whole needle to get the new O-rings. They're about $6 each so I really want a source for the O-rings by themselves.

I just got the low-end needle in the mail a few minutes ago. I'm putting it in right now and see how it goes.
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Old 08-13-2014, 07:49 PM
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I don't know if loctite is nitro resistant but most people believe loctite is only for holding screws tight. It's 2nd use is to prevent fretting and galling. And as a lubricant to achieve proper torque specs.

I use lucky 7 sealant on all my engine screws including the carb
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Old 08-20-2014, 12:38 AM
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Originally Posted by mtpocketsracing View Post
I don't know if loctite is nitro resistant but most people believe loctite is only for holding screws tight. It's 2nd use is to prevent fretting and galling. And as a lubricant to achieve proper torque specs.

I use lucky 7 sealant on all my engine screws including the carb
On the low and hi needles too?
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Old 08-20-2014, 04:30 AM
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I see ruined o-rings all the time...it happens when guys start counting their needle turns...bottoming out the needles then counting turns...The movement over the in internal threading are usually enough to tear the o-rings.....
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Old 08-20-2014, 05:15 PM
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Originally Posted by mercfocus View Post
On the low and hi needles too?
Yeah around the head. Not on the threads. The lucky 7 is applied to the outside of the engine parts.
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Old 08-20-2014, 05:17 PM
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i had exactly this problem a couple of weeks ago.

just use a little bit of electrical tape on the threads of the needle. worked for me
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