Question about OS FS-90 engine - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-09-2003, 08:43 PM   #1
Lord Kimbo
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I am: Adam Woodhouse
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Question about OS FS-90 engine

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I am mounting a never ran, but older FS-90 engine and have 3 questions. Both are not mentioned in the manual.

The engine is not pumped.

1) does the fuel tank location matter like a 2 stroke (in regards to the carb)?

2) the carb is going to sit lower than the center point of the fuel tank (because the engine is inverted). Will this cause a problem?

3) the muffler has an optional pressure line attachment to the fuel tank. I was going to hook it up. What is the difference if I don't (I thought all non-pumped engines needed a pressure line)?
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Old 09-09-2003, 09:39 PM   #2
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I have mostly ran my FS90 and FS120 inverted. Ideally, the middle of the tank should be in line with the carb, but I have had them higher and lower, and it does not make much difference.
I always had them mounted right behind the firewall.
Always used the muffler pressure.
On the fuel line, I use a T piece. So, when I fill from one end, it goes both to the carb as well as the tank. I make sure when I fill that the barrel is closed. This way, the carb gets automatic priming.

Good luck with it. Its a sweet running motor. Keep it a bit rich and use Coolpower 15% synthetic 2 stroke fuel. Green stuff.
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Old 09-09-2003, 10:06 PM   #3
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Maqsood has a pump that will work great with the FS90....... Then you can put the tank wherever you want .....
Use an OS F plug in there of course.... and if your tank remains higher than the engine, fuel will syphon through the carb........ can be ugly....
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