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Extension on needle valve

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Old 11-20-2003, 01:27 AM
  #1
wagondriver
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Default Extension on needle valve

I have a OS 46 and the needle valve does not extend outside the cowl. Does anyone have any ideas on what can be done to extend something on the needle valve so the engine can be tuned.
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Old 11-20-2003, 05:23 AM
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Default RE: Extension on needle valve

On my OS .61 I used a piece of music wire poked into the center hole on the Needle valve,
and soldered it in. I then tightened the set screw to hold it there. The 1st one wasn't soldered and fell out. I then bent the protruding end like the end of a T pin. so It was easier to make fine adjustments with.
The worst thing about this set up is you have to unscrew and remove the needle valve before removing the cowl. I tried the same thing on a 4 stroke Saito .91, but it
Vibrated too much and wore an oblong hole in the cowling, before it too snapped off, I just use a long slender screwdriver in the hole now. I seldom have to adjust this needle anyway.

Smoky.
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Old 11-20-2003, 10:36 AM
  #3
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Default RE: Extension on needle valve

You can also use a small L-shaped hex key as a ready made extension. The kind that come with a package of wheel collars is good. Be sure to put thread locker on the set screw.
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Old 11-20-2003, 10:44 AM
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Default RE: Extension on needle valve

Central Hobbies has a needle valve extention for $11.00.
Check it out ... seems well thought out.
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Old 11-20-2003, 04:46 PM
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Default RE: Extension on needle valve

Most Needle Valves have a hole with a set screw so that you can simply place a piece of scrap rod (like push rod) into the hole, and hold it with the set screw. Then, as others have said, bend the end into an "L" shape to give you something to turn.
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Old 11-20-2003, 08:22 PM
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Default RE: Extension on needle valve

You can dress down a 2-56 Allyn head sheet metal screw (DuBro) so it will fit in the hole in the needle valve, and tighten the set screw on it. Then use the 2-56 size ball driver through a small hole in your cowl to adjust the engine. Neat and clean solution, nothing outside the cowl.

Clair
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Old 11-20-2003, 09:56 PM
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Default RE: Extension on needle valve

Use soft wire, accidents do happen.
Ed M.
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Old 11-21-2003, 12:08 AM
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Default RE: Extension on needle valve

If I can post pictures of my TT 120, you can see the head of the sheet metal screw at the end of the needle valve, ready for a ball driver for adjustment.

Clair
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Old 11-21-2003, 12:21 AM
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Default RE: Extension on needle valve

How about the needle valve on ST engines??? They have a piece of wire in the center that you cannot get out, nor can you add an extension. It has bugged me for a long time, this design.
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Old 11-21-2003, 10:54 AM
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Default RE: Extension on needle valve

Yea Art, I think Enya used to do that too. I just came across one of those in my shop this morning.
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Old 11-21-2003, 11:29 AM
  #11
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Default RE: Extension on needle valve

Art,
Can't you grind a slot in the end with a Dremel and use a screw driver?
Dennis-
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Old 11-21-2003, 02:45 PM
  #12
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Default RE: Extension on needle valve

Art, I know what you mean about the ST engines. Cut the wire off to about 1/4" in length, and then solder a piece of 3/32" brass tubing over the stub, and also with your wire extension in it. Or, solder the SM screw, as in my pictures, into the brass tube. Would be easier if they just followed the OS approach, wouldn't it!


Clair
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Old 11-26-2003, 05:24 PM
  #13
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Default RE: Extension on needle valve

DB-I grind a slot in the head for a screw driver, or , as an option, grind flats on opposite sides of the nob and cut a matching slot across the end of a dowel or brass tube tha engages it. Extending a wire through a hole in the cowl just makes the cowl hard to get off...JIM
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Old 02-05-2004, 06:11 PM
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Default RE: Extension on needle valve

I had the same problem with my Fox .60. not having enough room outside the cowl. I took an old needle and cut the needle off leaving the grip. I made a collar out of aluminum tubing and JB welded the two needle grips together using the collar to keep it all together. Works great and looks stock!
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