ST2300 running issues - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-30-2007, 09:52 PM   #1
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ST2300 running issues

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Guys, I have a question, and I'm hoping someone can answer this. I have a ST 2300 engine with about 8 flights on it. I just put it on my Super Decathlon by RC GUYS (awesome plane). When I prime it, it doesn't hold prime at all like smaller OS engines, etc. With the carb full open, and my thumb fully over the bore, I flip and flip and flip until about 4 turns later it comes up. Even with my thumb on the bore, she immediately withdraws back to the tank. The tank is tight, no leaks anywhere, no cracks or holes in the line, fuel filter is sealed ????? Is this because it is a ringed engine? I'm drawing a blank. I will fire up and run (needs tweeking). I have a bisson pitts on it, and don't know if I should also plug one of the outlets to give greater back pressure.
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Old 10-30-2007, 10:56 PM   #2
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Pressure Line plug

What you're describing sounds like a plugged Pressure line, you are creating a strong vacuum since the tank can't breath, when you flip it the carb draws fuel until the tank vacuum that's been created draws the fuel back in. Check the whole pressure side, including the fitting and port on the muffler. something is in there preventing proper breathing.

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Old 10-31-2007, 06:14 PM   #3
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Well, it was not a vacuum issue. Here is what I found out. I called Super Tigre, and they said this is normal for ringed engines, and that when it is running, the fuel will be constantly fed to the carb.....not so. I'm running large fuel tubing with a bisson pitts exhaust. No matter how much I leaned or richened the high speed needle, there were no changes to the rpm. I plugged one of the exhaust stacks, and now the high speed needle does affect rpm. I believe that it was running lean before I plugged it. So, now it is running much better. Back pressure is increased, thus pushing more fuel into the needle. Runs as good as an OS! I can see now why people are putting the perry pump and carb on them, but I don't think it's necessary.
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Old 10-31-2007, 06:30 PM   #4
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st 2300

I have been all through the BS with that engine.Every time you think you had it solved it will let you down. When the temperature changes you will have to retune it. Buy the perry pump and carb and save the headaches and your plane!!! Been there -done that JR
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