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HelicopterEngines Plugs Mufflers Fuel › OS 91 CSPEC Pump is Flooding the Carb
01-22-2007 02:51 PM  10 years agoPost 1
Louisiana Helicam

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West Monroe, LA

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Guys, I just purchased a new OS C-Spec with pump. This is my first pumped engine. The problem that I'm having is that it is throwing too much fuel into the carb and hydrolocking the engine. It's pushing fuel so hard that it pushes it through my fuel line clamp and still tends to flood the engine. I'm getting a little tired of having to lean the low needle and/or loosening the glow plug to start it. What's the deal? I've plumbed it to where I'm dumping fuel back into the tank (rather than going to the T-Valve as mentioned in the manual). Before I bought the engine, I did purchase one of these for it (upon someone's recommendation):

http://www2.towerhobbies.com/cgi-bi...L=++&search3=Go

Are these crap? Should I get rid of it and stick with the non-pumped SZ-H?

www.louisianahelicam.com

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01-22-2007 03:14 PM  10 years agoPost 2
marked23

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Lynnwood, WA

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So you are using the 60K cateye with the 60M carb? Or is you setup all stock still?

Just for reference, the 60K carb is smallish bored and designed to be used on muffler pressure. The 60M is big bored and designed to be used with pump pressure. The different cateye might be part of your problem, but I'm not sure.

My stock c-spec w/pump was difficult to start when new... I had to losen the glow plug. After a couple gallons it got better.

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01-22-2007 03:32 PM  10 years agoPost 3
Louisiana Helicam

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West Monroe, LA

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I am using the 60K cateye from Tower Hobbies.

www.louisianahelicam.com

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01-23-2007 04:27 PM  10 years agoPost 4
Louisiana Helicam

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West Monroe, LA

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Any other opinions.

www.louisianahelicam.com

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01-23-2007 05:39 PM  10 years agoPost 5
marked23

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Lynnwood, WA

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Disconnect your return fuel line so that you can see the fuel coming out.

Turn the engine over with your starter (with fuel, but without lighting the glow plug). Watch the fuel come through the return.

If the fuel does not not come through the return line, then take off that red nipple and look inside there. There is a tiny, almost invisible, flap valve. Make sure it's in there the right way and not damaged or obstructed.

Where that red nipple is connected to the carb, there is an orifice that serves to provide a tiny bit of back pressure against the pump. Check if that orifice is blocked.

Since you are using a different cayeye, you may need a different sized orifice to get the fuel pressure into the right range. The OSMG0165 "Third Needle" is just the thing.

OR

Put the 60M cateye back in and see if that helps.

OR

Just keep running the engine. It will loosen up over time.

-Mark

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HelicopterEngines Plugs Mufflers Fuel › OS 91 CSPEC Pump is Flooding the Carb
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