O.S. .40 fp - RCCanada - Canada Radio Controlled Hobby Forum
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Old 11-29-2003, 11:36 AM   #1
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O.S. .40 fp

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Those of you who use an O.S. .40 fp have you ever found a little blockage of lint built up in the carb? My engine was cutting out everytime it was throttled back for a landing and after allot of time searching for the problem it was finally discovered that a ball of lint was stuck in it. I talked to another guy at a different field and he said that it's a common quirk in these engines that they pick this stuff out of the fuel and to check them every few flights. Just throwing this out there to see if anyone else has this problem.
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Old 11-29-2003, 05:29 PM   #2
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Nope, never heard of it. Where is the lint coming from in the fuel though?? Are you using a filter before the carb? If not wouldnt that be easier?
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Old 11-29-2003, 06:28 PM   #3
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Well, I don't know if it's common. But I've seen it now in 3 engines. They ran inconsistent. One was a Saito, two were OS. The usual blow the crap out of the spray bar did not fix it. I had to take the carb right apart and "viola". I've never had one of my own engines with the problem, then again I use two fuel filters before I pump it into my tank. Never enough filters.

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Old 11-29-2003, 08:09 PM   #4
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Yup I filter my fuel before it goes into the plane. We finally found out what the problem was when we turned the needle super rich and the engine was screaming lean . I guess it built up over time effecting the engine performance a little bit everytime we went flying. It took a little piece of metal and a compressor blast to take it out ( it was really jammed in there ). I guess it was right at the end of the needle valve.
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Old 11-29-2003, 10:09 PM   #5
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I had this problem some years back ...... and yes the lint does come from the fuel ....... something to do with the filtering systems some companies use.

I don't like running fuel filters on my airplanes ..... usually just somewhere else for an air leak.

So I have 2 filters on my fueling system, just to catch this lint.

Every 3 or 4 gallons of fuel I take the filters apart and there's the lint., clean the filters out and I'm good for another few gallons.
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Old 11-30-2003, 09:24 PM   #6
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Hi all,
After reading the post about lint and other crap
in the filter l thought it was a bit far fetched :P
But decided to check my filter in the line from my
pump. Guess what, L I N T Not a lot but enough.
Is it from the fuel or picked up airborne as tank is
fueled and defueled
I suggest you check your filters, you might be surprised
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Old 12-15-2003, 12:24 AM   #7
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I've seen lint in filters a few times. I use a filter on my pump and not on the plane.
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Old 12-15-2003, 07:35 AM   #8
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It happens with gas engines too,except the "stuff" whatever it is gets caught in the screen filter built into Walbro carbs until the fuel flow is restricted enough to affect your needle settings.
I use chain saw filters in my fueling jug but I still have to check the carb screen periodically.I dont like in line filters..........one more place for an air leak IMO
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