OS LA .25 Fuel Nipple - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-10-2019, 04:25 PM   #1
NEW222
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OS LA .25 Fuel Nipple


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Hi there. A short while ago, I purchased an OS LA .25 from a member here. I just recently today had a chance to give it a run. So I mount it up on my new test stand and get everything ready, including filling my tank up. This is my first LA engine, so I was confused about hooking it up to a remote needle. Well, to my shock, there was no fuel nipple. It was then I found it was broken off. Whether it was like that when I bought it, I do not know, nor am I blaming anyone. I am happy with the engine overall, but I am just looking for options to fixing this minor hiccup! So, has anyone else had this problem in the past and how did you fix it. Or even does anyone here happen to have any ideas as to how to fix it or modify it to work as I do not have any spare parts for it. Thank you.
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Old 07-10-2019, 06:46 PM   #2
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Re: OS LA .25 Fuel Nipple

rcjapan.net
look under os engines, parts, cover plate and scroll down and there she be.
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Old 07-10-2019, 07:50 PM   #3
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Re: OS LA .25 Fuel Nipple

If you have a small nipple (like what you see used for a pressure tap on a muffler) you could try and drill/tap the nylon and epoxy or JB weld the nipple.

Ive seen these OS plastic parts repaired with just a short length of K&S brass tubing the same way, drill and place the tubing in the hole and JB weld.

If you arenít attached to the NV assembly, you can use any NV as a remote - I have a lot of NIP OS needle assemblies that are usually used threaded into a carb body - but they work fine as a remote NV, you just need to mount it somewhere.
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Old 07-10-2019, 08:10 PM   #4
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Re: OS LA .25 Fuel Nipple

Thank you for the tips Andrew. I just sat back down as it was really bothering me so I thought 'What do I have to lose?'. I cleaned it up and drilled it out to 1/8". I then took a piece of K&S 1/8" brass tube, filed it to an angle, cut it to length. I then sanded the black needle body and tubing and followed it up with a good cleaning of 91% alcohol to clean. From there I inserted it in the correct orientation with the needle hole and carefully used JB Weld around the outside perimeter just as you mentioned. Now I will let it sit for the weekend and re-install the backplate assembly when I get home Sunday, or Monday after work. From there, only time will tell, but it does look promising to work. Also funny you mentioned pressure fitting as that was my first thought, only to realize I would have to make a trip to the hobby shop to get one and I had the brass tube on hand. So thank you for your help, time, and advice.
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Old 07-10-2019, 08:12 PM   #5
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Re: OS LA .25 Fuel Nipple

And I did not want to risk moving it, so I did not take any pictures tonight in case I disturbed it, so I will update this thread tomorrow with pictures when it will be safe to handle. As for now, I have the backplate placed loosely in the engine and propped it up so it will sit straight to dry. If after I attempt to run it and it does not work out, I will sacrifice the needle assembly from my AX .46 and try that.
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Old 07-10-2019, 08:28 PM   #6
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Re: OS LA .25 Fuel Nipple

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Originally Posted by NEW222 View Post
And I did not want to risk moving it, so I did not take any pictures tonight in case I disturbed it, so I will update this thread tomorrow with pictures when it will be safe to handle. As for now, I have the backplate placed loosely in the engine and propped it up so it will sit straight to dry. If after I attempt to run it and it does not work out, I will sacrifice the needle assembly from my AX .46 and try that.
If it doesnít work, shoot me an email and Ill send you a suitable replacement for the engine. Donít go scrounging parts from your other ones, OK? You know how to reach me..
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Old 07-11-2019, 09:01 AM   #7
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Re: OS LA .25 Fuel Nipple

I have tried just about every combination to salvage a needle valve. They all worked. Mostly I drill and tap for a pressure fitting. I have soldered tubing on to a broken needle valve on a carb, drilled and tapped a pressure fitting, and then used a remote needle from something else. A broken hole can sometimes be tie wrapped through the other hole on to a bracket. Lots of ways. The LAs are great motors, but the weak points are the plastic and the odd time, the peeling liner. Not that often though. Some swap meet ones I got the backplate just disintegrated. I machined them up from aluminum, but some are still available. I saw a shallow slot on each side of where the needle is, so that if it breaks in a crash (If ever hehe) it will break clean and not take out the corner with the hole.
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Old 07-11-2019, 09:17 AM   #8
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Re: OS LA .25 Fuel Nipple

Not sure if unwilling to simply cut that off, but there are other remote needle kits that could replace that one.

I have used some from OS and even Fox. My fave still is the very inexpensive EVO as this often was a bolt on fit to the rear of most 40 class engines:

https://www.google.com/search?q=evol...w=1269&bih=579

Imagine not too difficult to adapt to the bolt spacing on the 25.

As with the engine in the pic, I did a lot of these. Mostly for safety by moving the HS needle further away from the prop.
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Old 07-11-2019, 10:21 AM   #9
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Re: OS LA .25 Fuel Nipple

Evo has shut it's doors, and Mecoa has bought the Fox stock. I doubt the remote is available. There is a K&B one and a Fuji remote, kind of expensive. I have a few Fox ones and they work good, unlike most Fox stuff. It is a bit heavy but fairly universal. Jett has some nice ones, and you may find a Perry too. I'd go Jett before K&B for just the price alone.

Last edited by aspeed; 07-11-2019 at 10:30 AM.
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Old 07-11-2019, 04:50 PM   #10
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Re: OS LA .25 Fuel Nipple

Ok. So, here it is. It is still a bit tacky, but has been less than 24 hours. I will also not be running this till next week, Monday hopefully so will have some more time to cure. And just another quick question regarding the backplate screws. I believe they are 2.6 x 8 mm. Is there anything I may be able to tap them to that is more readily available as they are very worn out. It is assembled now, and do not plan on taking it apart again, but if something easy and local, or even better if I have something here, would be alright, I will explore that option. Mainly, is there a standard size tap that is close to this that I could use. Thanks again.
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