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Scorpion Power GLOBAL 3D
HelicopterEngines Plugs Mufflers Fuel › TT 50 Idle Needle Mod
02-02-2004 07:38 PM  13 years agoPost 1
G.Man

rrProfessor

Bristol

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Needle mod

As I get about 10 pm's/emails a week about how to mod the needle, I thought I would do a step by step... incase its worth a sticky

This is Not my method and all credit goes to Russ Deakin for modding a great many club members Idle Needles

1. Close the throttle fully and then wind the idle needle in as far as it will go...

2. Remove idle needle and it should have a feint ring on the needle where the seattouched it.. (about 1-2mm in from the tip if I remember right)

3. Chuck the idle needle up in a drill stand and mark the line more clearly for reference..

4. Taper the needle from the tip to the seat line evenly using a needle file so that it is just about 0.8mm at the tip and original width at the seat...

4a. Some do a concave taper a lot longer along the needle and have had good results p.m. Mr_Magoo if you want further info as I have not tried this.

5. Clean up the needle with some wet and dry and some wd40 for lube, this will give a nice finish, suggest 400 grit/fine paper

6. reinsert needle, close carb fully, screw in idle needle til it seats and back out 2.75 turns

7. Set main needle to about 2.75 turns out

8. Go fly and tune accordingly noticing you can now have a good non-slobbery-rich idle and no lean spot at mid-full throttle....

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02-03-2004 12:49 AM  13 years agoPost 2
Tom DeWinter

Veteran

Quad Cities, IL

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Wish I'd had this info before I did my own mod. Your method of marking the contact point makes a lot of sense. I did a taper on mine and improved it, but I had no point of reference. I may get a new needle to try. Currently, I've got my OS in the heli. Now, if only I can keep a set of bearings in it...

Quad Cities RC Whirlybirds -- FunFly July 12 & 13, 2008 Davenport IA
Plan Now to Attend!!!

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02-03-2004 07:21 AM  13 years agoPost 3
donlynn

Key Veteran

New Zealand

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Gidday

Thanks Galifrey

So do you still need to uniflow also and if so what do you use for the tank fitting?

Regards Don

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02-03-2004 08:50 AM  13 years agoPost 4
G.Man

rrProfessor

Bristol

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Haven't found the need to uniflow the TT50 at all it seems to stay consistent all the way down the tank

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02-11-2004 06:35 PM  13 years agoPost 5
G.Man

rrProfessor

Bristol

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bump

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10-13-2006 12:57 PM  10 years agoPost 6
StevieM

Heliman

Surrey UK

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Realise resurrecting an old thread here but, have a quick question relating to this mod.
-
Not run my new TT50 as yet but am just preparing myself in case of the expected lean mid-range issue.
-
My LS needle is 1.10mm at tip, and "seat point" approx 2mm from tip.
-
If, as per instructions, I close carb fully, gently drive LS needle screw home, then unscrew 2.75 turns, and open carb just enough to be able to see tip of needle/mouth of tube, then I observe that the tip of the needle is ALREADY clear of the tube, before even opening to 1/4 throttle.
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Qu.... can I therefore presume that the LS needle has an affect on mixture despite not even sitting partially in the tube??
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Happy to fiddle if need be... (successfully managed to rectify a rich mid pbm with aircraft Magnum 52 engine, by shallowing the taper of the LS needle, although could understand how this made difference, as the LS needle only cleared the tube at approx 1/2-2/3 throttle.)
-
Thanks, Steve

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10-14-2006 08:21 PM  10 years agoPost 7
RussD

Veteran

UK

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Hi Steve,

Sorry for the delay in getting to this one!

From memory, the newer type needle with the dual O-rings was better than the original but still required a little modification for high-speed operation and higher Nitro fuels. I also think you will find that you have to screw the needle in much further than advised in the instructions to obtain a tickover ;-) The ideal scenario is that the needle clears the tube at high throttle, thus adjustments to the low needle have minimal effect on the high-speed needle setting.

Hope this helps...

RussD.

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10-15-2006 09:55 AM  10 years agoPost 8
StevieM

Heliman

Surrey UK

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Thanks for that.
-
Will experiment ....Rgds, Steve

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12-15-2010 07:11 PM  6 years agoPost 9
myjane

Senior Heliman

new zealand

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thankyou you guys i have a asp 46 carb , new with a couple of tanks through it and it fits in the block and i wondered if it would work i will try the mods ,,,,,,,,,,

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HelicopterEngines Plugs Mufflers Fuel › TT 50 Idle Needle Mod
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