Loose High Speed Needle...RCV 1.20sp
My idea is to wrap the threads with some teflon tape to achieve a tight fit. Thoughts..?
Raz
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).
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?
Thanks,
Raz
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.
Razmo:<o></o>
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.<o></o>
The new oneI bought from RCV is doing better (knock in the wood).<o></o>
As per themuffler, there is no simple solution. <o></o>
Some peoplehave good results replacing it with an OS muffler, that has a welded tip.<o></o>
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!<o></o>
After thatI bought a custom muffler from Weston <st1lace w:st="on"><st1:country-region w:st="on">UK</st1:country-region></st1lace> but didn’t try it yet (no planefor this engine at the moment).<o></o>
I knowKeleo Creations have a nice muffler for your engine. <o></o>
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.<o></o>
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...
Raz
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.
Thanks,
Raz
Grinder.
Also, any reason I shouldn't use my APC 3 blade 15.75x13 for break-in?
Thanks,
Raz