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.049 needle valve
Page 1 of 1
.049 needle valve
I want to clean the threads on a .049 engine's needle valve. What size are the threads, measures close to a # 2 screw thread. Thanks for any assistance.
johnv58- Moderate Poster
- Posts : 24
Join date : 2011-11-17
Age : 65
Location : Rochester, NY
Re: .049 needle valve
What kind? Did it come off of an engine with a intergral tank? (this one will be black) Or one with just a backplate? (this one will be longer)
Last edited by microflitedude on Mon Jan 09, 2012 10:10 am; edited 1 time in total
Re: .049 needle valve
See if you can match it to any of these - http://coxengines.ca/search.php?mode=search&page=1
Re: .049 needle valve
take a Kleenex(R), put a few drops of fuel on it, carefully wrap it around the needle threads,johnv58 wrote:I want to clean the threads on a .049 engine's needle valve. What size are the threads, measures close to a # 2 screw thread. Thanks for any assistance.
and turn the needle around a few times. then you should see all the "schmutz" that was stuck in the threads
on the Kleenex
regards,
Beez
GermanBeez- Platinum Member
- Posts : 1167
Join date : 2011-06-15
Location : Bavaria, Germany
Re: .049 needle valve
The engine is from one of the cars...Baja Bug / Dune Buggy. It does have its own tank, backplate is diecast. I did get all the goop out of it, now it seems the threads are messed up. Not bad, just wanted to see I could save it by running a tap in it. If not I'll replace it.
johnv58- Moderate Poster
- Posts : 24
Join date : 2011-11-17
Age : 65
Location : Rochester, NY
Re: .049 needle valve
microflitedude wrote:See if you can match it to any of these - http://coxengines.ca/search.php?mode=search&page=1
Darn, I read all 25 pages of the catalog...now I'll have to go through it again to order all of those things that I didn't know I needed plus all of the ones I didn't know were available!
George
gcb- Platinum Member
- Posts : 908
Join date : 2011-08-11
Location : Port Ewen, NY
Re: .049 needle valve
As to a stuck needle, I'd suggest turning in small increments back and forth before trying a full rotation.
SuperDave- Rest In Peace
- Posts : 3552
Join date : 2011-08-13
Location : Washington (state)
Re: .049 needle valve
Sounds like you have a Babe Bee style engine with the attached 5cc aluminum fuel tank. In that case the needle thread is a 4-80.
Regards, Matt
Regards, Matt
Re: .049 needle valve
SuperDave wrote:As to a stuck needle, I'd suggest turning in small increments back and forth before trying a full rotation.
Yea bit of heat never goes a miss.
Re: .049 needle valve
OK I will attempt to locate a #4-80 tap and see where it goes, thanks.
johnv58- Moderate Poster
- Posts : 24
Join date : 2011-11-17
Age : 65
Location : Rochester, NY
Re: .049 needle valve
4-80 Tap
Before buying a tap, I would be inclined to try thoroughly cleaning the threads on the needle and valve body, then attempting to carefully re-thread the needle into the spraybar. Getting an extremely fine threaded tap restarted correctly can be difficult, especially if the entry threads have been cross-threaded.
Before buying a tap, I would be inclined to try thoroughly cleaning the threads on the needle and valve body, then attempting to carefully re-thread the needle into the spraybar. Getting an extremely fine threaded tap restarted correctly can be difficult, especially if the entry threads have been cross-threaded.
Re: .049 needle valve
johnv58 wrote:OK I will attempt to locate a #4-80 tap and see where it goes, thanks.
To be honest, if the spraybar that is pressed into the backplate is stripped, or no longer useable you are better off getting a new backplate with the spraybar installed. It will be much cheaper than a 4-80 tap/die set.
Regards, Matt
Re: .049 needle valve
Thought about that, but I did find a tap for $20 and would have it for future problems as well.
I better sleep on this.
I better sleep on this.
johnv58- Moderate Poster
- Posts : 24
Join date : 2011-11-17
Age : 65
Location : Rochester, NY
Re: .049 needle valve
If you are having trouble getting the tap started because the first turn on the threads are damaged then try taking a smaller tap (like a #2 or #3-80) and using it to cut the damaged first threads until you can get the original tap to start. It is like using an internal thread file.
Good luck,
Bob
Good luck,
Bob
fit90- Diamond Member
- Posts : 1336
Join date : 2011-08-11
Location : Naples, Florida
Re: .049 needle valve
Just wanted to end this topic with a note. I did purchase the #4-80 tap through a knife builders website. It did the job, I must have messed up a thread when cleaning the spraybar and now it is fine. Thanks all for your help.
johnv58- Moderate Poster
- Posts : 24
Join date : 2011-11-17
Age : 65
Location : Rochester, NY
Re: .049 needle valve
GermanBeez wrote:take a Kleenex(R), put a few drops of fuel on it, carefully wrap it around the needle threads,
and turn the needle around a few times. then you should see all the "schmutz" that was stuck in the threads
on the Kleenex
regards,
Beez
I'd like to throw in one last thought, if I may. I spent many years occasionally frustrated that some tanked engines wouldn't needle easily after a fresh rebuild. After reading an article about building a reliable unwavering Texaco endurance engine, I realized my problem may have been fibers from the paper towels I was using to clean the parts. After switching to only lint-free rags, including laying one down as my assembly surface, I have a lot less paper weights when I crank it the first time.
The spraybar and needle orifice is so tiny that an unbelievably small amount of paper fibers can tangle up foul it like hair in a drain. I use a magnifying glass to inspect the components one at a time as it goes back together. It's amazing how much stuff I still find. Anything in the tank area can end up inside the spraybar, so look in all the nooks and crannies. On the reed side and in the venturi it's not nearly as critical. It can usually belch out and burn bits like paper fibers and shredded grass with no problem.
At Lowes, in the paint section, you can buy bags of t-shirt material squares that claim to be lint-free. After a couple of washes WITHOUT a dryer sheet, they can be used as car rags or whatever suits your needs.
Just a suggestion.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: .049 needle valve
My problem is cat hair, my wifes two cats sleep by my little work bench. Cant touch or pick up anything that does not have hair, add a little castor its a problem.
I have to clean two or three times, drives me nuts.
I have to clean two or three times, drives me nuts.
crankbndr- Top Poster
- Posts : 3073
Join date : 2011-12-10
Location : Homestead FL
Re: .049 needle valve
I bought a pack of those. They stunk something awful but they were lint free.microflitedude wrote:Goodwill sells "goodwipes", which are torn up shirts like Rusty said.
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
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