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Loose High Speed Needle...RCV 1.20sp

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Old 08-04-2010, 10:04 PM
  #1
Razmo
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Default Loose High Speed Needle...RCV 1.20sp

I have a new 1.20sp and noticed that the high speed needle has quite a bit of play when opened. When fully closed, it seats fine and feels solid. However, when I open the needle to the recommended 2 turns (less or more) open for break-in, it's very loose feeling. This doesn't seem normal, can anyone confirm?

My idea is to wrap the threads with some teflon tape to achieve a tight fit. Thoughts..?

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Old 08-05-2010, 06:23 AM
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Default RE: Loose High Speed Needle...RCV 1.20sp

Teflon tape only works when tightening a thread. As soon as you reverse the rotation you will loose the seal.

We use fuel tubing over the needle AND base to form a seal with good success. Can be a bit of job stretching it on, but when in place it will seal well for ages.

OR

Try finding a bigger 'O' ring for the needle, maybe an OS or similar.

The carby's on the RCV really do let them down (as does the exhaust).
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Old 08-05-2010, 10:47 AM
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Default RE: Loose High Speed Needle...RCV 1.20sp

Interesting, okay looks like the Teflon tape isn't the solution. Thanks.

Can you help me to understand your fuel tubing method? I don't understand where you are fitting the fuel tubing. Do you mean you slip a piece of fuel tubing slightly above the threads of the high speed needle, therefore the tubing acta as a bushing?

P.S. Can you suggest any protective measures I should take with the exhaust?

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Old 08-05-2010, 01:27 PM
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Default RE: Loose High Speed Needle...RCV 1.20sp

The fuel tubing just slips over the needle and the tube the needle screws into

A pic is easier than words

If the muffler is the standard one with the pressed in end, then it WILL blow the end out.
I found the only effective way of keeping it together was a bead of weld around the end plug seam.
Same as the OS mufflers, they have the end welded on.

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Old 08-05-2010, 01:32 PM
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Default RE: Loose High Speed Needle...RCV 1.20sp

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Razmo:>>

I have anRCV 90SP and also had trouble with the O ring in the needle. It didn’t resistthe methanol for long and the needle screwed in with vibration, leaning themixture until the engine stopped.>>

The new oneI bought from RCV is doing better (knock in the wood).>>

As per themuffler, there is no simple solution. >>

Some peoplehave good results replacing it with an OS muffler, that has a welded tip.>>

I tried theOS muffler but, in my case, the pressure nipple came off with the highertemperature of the engine. The result was a flame out in the air!>>

After thatI bought a custom muffler from Weston lace w:st="on">UKlace> but didn’t try it yet (no planefor this engine at the moment).>>

I knowKeleo Creations have a nice muffler for your engine. >>

Mysuggestion is: use the original muffler on the bench until the tip came off. Thenreplace it with one of these aftermarkets. Never fly with the original muffler.>>

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Old 08-05-2010, 01:38 PM
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Default RE: Loose High Speed Needle...RCV 1.20sp

I understand now, thanks so much for the picture. You mean to slip the fuel tubing over both ends. I was thinking of filling the gap around the needle instead.

I may try a wrapping the threads with some teflon tap, simply to thicken up the thread so it's a tighter fit. Have you tried this?

I'll be sure to take a look at the exhaust tonight...

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Old 08-05-2010, 01:46 PM
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Default RE: Loose High Speed Needle...RCV 1.20sp

Arruda,

Thanks for the reply. Yeah, my needle seems very loose. Enough to irritate the mixture setting it seems. It seems that a thicker 0 ring may do the trick aling with the fuel tubing solution that mboland mentioned.

RCV, are you going to chime in here? Would you mind sending me a set of O rings that would help tighten up my needle. That is of course, unless you can send me a better fitting high speed needle.

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Old 08-05-2010, 01:51 PM
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Default RE: Loose High Speed Needle...RCV 1.20sp

Regarding the muffler, any tried some High Temp JB Weld? Supposedly, withstands temperatures up to 500° F.

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Old 08-05-2010, 02:03 PM
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Default RE: Loose High Speed Needle...RCV 1.20sp

Yes, I have tried JB Weld. It didnt work.
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Old 08-05-2010, 09:39 PM
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Default RE: Loose High Speed Needle...RCV 1.20sp

I put a peice of tubing over the needle. It was a bear getting it on there though. Get the largest you can get and maybe heat it up a bit to soften it up.

Grinder.
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Old 08-06-2010, 10:10 AM
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Default RE: Loose High Speed Needle...RCV 1.20sp

Thanks for all the input guys!

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Old 08-07-2010, 02:39 PM
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Default RE: Loose High Speed Needle...RCV 1.20sp

You guys pulled the clicker off the carb, right? I pulled the clicker off and fit some fuel tubing over the needle valve. Seems to work nicely. Hope to break her in tomorrow morning.

Also, any reason I shouldn't use my APC 3 blade 15.75x13 for break-in?

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