FS 120 info ? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-29-2008, 02:29 PM   #1
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FS 120 info ?

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I have come across a FS-120 surpass 2. The engine is used but apears to be in very good condition with box,tools and paperwork.This is a pumped engine and I have no experiance with such. Im sure it has been in the box for a period of time. It seems a bit heavy 34 oz ?. Could some one with experiance give me some input about reliability and is this a strong unit. Would like to put it in a sport/3 D airframe, not sure what weight,prop exc. I should be looking at. Apreciate any input, thanks.
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Old 01-30-2008, 12:41 AM   #2
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mounted the engine on a test stand and ran tonight, filled the shop with smoke big time. seemed very finiky to adjust but above all it was very noisey. Sounded like bearing or gear train noise, it was very pronounsed. Also noted bubbles coming out from under valve cover, screws are tight. Not feeling to compfortable with this, thinking I might put it back in the box and return it to its rightful owner. Any input ?.
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Old 01-30-2008, 07:00 AM   #3
Ed Smith

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I cannot comment on the noise except to say that any engine run in an enclosed space sounds awful. Bubbles coming from under the valve cover is not a problem. The early four strokes did not have valve covers. Make up a paper gasket, that will solve that problem.

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Old 01-30-2008, 10:18 AM   #4
Mike Sebastien
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You have a great engine, in its time it was one of the best on the market. I have had 2 of them.

The bubbles are caused by blow-by either in the valves or through the crankshaft. Don't worry about it unless excessive.

One of the problems with this engine is the pump, it puts out way too much pressure. The solution is to put a T fitting between the pump outlet and the carb. The Tee is then routed back to the fuel tank. This effectively lowers the fuel pressure by routing excess fuel back to the tank. The needle valve range will be broaden making it much easier to adjust and the engine VERY reliable.
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Old 01-30-2008, 12:27 PM   #5
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Thanks, im thinking I would need a stoper with four fittings as the pump draws and returns excess fuel to and from the tank and the manual states to leave one open to vent. I can understand an engine would sound different in an enclosed area, altough not outside it is a large nine bay truck centre and you could still hear a "case noise ? " from two bays aside that still has me concerned. Mike Im sure you would have mentioned if your engines seemed noisy, I think Im going to pass on this one and return it as I don't really need and seem to have no shortage of things that are not just quite right or could use some improvement. thanks again.
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