OS 46 SF - trying to get it running after years of sitting - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-29-2019, 01:32 PM   #1
Amanks7477
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OS 46 SF - trying to get it running after years of sitting


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I have an old OS 46 SF that is in great shape. I got it years ago and it has sat in a box, I oiled it a few times, spent some time this winter cleaning it up and it looks great.

I want to put it into a fun little Tiger 2.

Since it has not run since I have had it, I put it on my test bench to try see if I could get it going.

Good and bad results. It took a while to get it going, but once it did start it ran very well - at full or close to full throttle. Taking it down to mid throttle or idle and it died. No changes to the tuning seemed to help much.

It seems like it is not pulling fuel out of the tank, and just sputters out. Could be a fuel line problem or could be something else.

Anyone have any ideas?
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Old 04-29-2019, 02:39 PM   #2
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Re: OS 46 SF - trying to get it running after years of sitting

Take a 7 or 8 mm wrench
Remove the hi speed needle seat
Check the needle valve cavity, normally this is where dirt or debit will accumulate
Make sure the fuel inlet nipple is clean.
Make sure your fuel line and tank is clean.
Put it back and try it.


If this does not work you will need to take appart the carb and clean it completely
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Old 04-29-2019, 03:14 PM   #3
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Re: OS 46 SF - trying to get it running after years of sitting

Did you take the tank apart?
If not, you need to, and replace all that stuff. All I have ever salvaged out of old glow tanks is the bare tank and sometimes the metal tubing and clunk.
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Old 05-01-2019, 03:08 PM   #4
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Re: OS 46 SF - trying to get it running after years of sitting

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Originally Posted by Mad_Mike View Post
Did you take the tank apart?
If not, you need to, and replace all that stuff. All I have ever salvaged out of old glow tanks is the bare tank and sometimes the metal tubing and clunk.
I cleaned out the needle and needle seat (no idea what it is really called). I had hoped that would work.

Started the motor up again today, at full throttle it runs great, at about 1/2 throttle it starts to sputter out and die. Takes about 5 seconds, fuel starvation, no question.

My next move, new fuel lines all around as well as a new fuel pick up in the tank. We will see what happens
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Old 05-01-2019, 03:13 PM   #5
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Re: OS 46 SF - trying to get it running after years of sitting

Quote:
Originally Posted by Amanks7477 View Post
I cleaned out the needle and needle seat (no idea what it is really called). I had hoped that would work.

Started the motor up again today, at full throttle it runs great, at about 1/2 throttle it starts to sputter out and die. Takes about 5 seconds, fuel starvation, no question.

My next move, new fuel lines all around as well as a new fuel pick up in the tank. We will see what happens
Sounds good. Let us know what happens
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Old 05-02-2019, 10:48 AM   #6
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Re: OS 46 SF - trying to get it running after years of sitting

You could richen the low speed needle and run it, putting your finger over the carb hole at full throttle and mid throttle to suck the old castor through. I do that quite often. Watch your fingers.
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Old 05-02-2019, 11:33 AM   #7
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Re: OS 46 SF - trying to get it running after years of sitting

Well thank God for the Ontario healthcare system, they reattach fingers regularly, liken said already clean the tank and fuel system, get some good carb cleaner and soak the needle/carb and blow it out. The old caster oil is thick and will readily plug the low and mid range passages
Mike
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Old 05-02-2019, 10:28 PM   #8
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Re: OS 46 SF - trying to get it running after years of sitting

Andy, I recently sold a 46 SF ABC that I bench ran. The high speed needle was exactly one turn out from closed. I would start with the low speed needle 3 turns out and see what it does. Cheers Floyd
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Old 05-03-2019, 06:10 AM   #9
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Re: OS 46 SF - trying to get it running after years of sitting

While all the comments about fuel lines and tanks are well intentioned, if the engine runs fine at full song then the tank and lines are fine. The problem is in the carb or with the carb adjustments, old fuel or a sketchy/dirty glow plug that won't retain heat properly anymore.
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Old 05-03-2019, 07:10 AM   #10
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Re: OS 46 SF - trying to get it running after years of sitting

Have to agree. The HS needle controls mixture from 3/4 throttle to full so if able to run wide open then you do not have any flow issues.

However, that is the hottest plug condition so may hide other issues.

I found on nearly every 2-stroke OS I start with that HS needle 1 3/4 turns out from lightly bottomed. You do this with the throttle fully open to prevent interference.

The LS needle should start even with the end of the barrel, not the external throttle arm adapter.

Once you have it running set the HS needle slightly rich of peak, then slowly drop throttle and tweak the LS till you have reliable idle. A quick snap full open to check response will fine tune the LS setting. If surges then picks up too rich. If it dies then too lean.

This procedure needs to be done with external heat off the plug as it will mask when your reach HS peak and hide fine adjustments.

It also is predicated on a mechanically intact and good condition engine. OS carbs tend to have problems once sat for a while, particularly in the O-ring(s) around the HS needle. If old, dried up or cracked they will not seal correctly and prevent proper adjustment. The quick fix is a piece of fuel tubing over the needle and receiver tube.

You will also find any time an engine is run new, after repair or long-term storage it can likely compromise the plug, sometimes making the engine difficult to start or remain running once heat removed. I try to run used plugs and keep a spare handy under these conditions till some time in as almost guaranteed it will require replacement. Can get expensive doing this with new plugs.

Where are you located? If close enough could offer to run it and set it up on the test stand.
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