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Model Forum / Radio Controlled / Air Models / May 2004Running in a 4-Stroke
I'm just running in an OS FS40 Surpass. I'm using GX-5 - at least, that's what the chap on the Model Technics stand at Sandown said it was; despite not saying so on the label. Twice now, it has stopped violently and thrown the prop off; actually breaking the spinner the first time. I've heard 4-strokes can be prone to doing this, but what can I do to avoid it? Am I running too rich? Too lean? Wrong fuel? CliveK I would guess at too lean and its semi seazing....back it off arf a turn and see if it runs much longer. > I'm just running in an OS FS40 Surpass. > [quoted text clipped - 10 lines] > > CliveK 4 strokes are prone to having a sudden backfire & doing just what you describe. Run it a little richer, but most of all get a LOCKNUT for the prop. Try just engines, they should have one. Tighten it up good & tight & that should cure your problem. It did for me. Ray > I'm just running in an OS FS40 Surpass. > [quoted text clipped - 10 lines] > > CliveK Would putting a spring washer on help? David > 4 strokes are prone to having a sudden backfire & doing just what you > describe. Run it a little richer, but most of all get a LOCKNUT for the > prop. Try just engines, they should have one. Tighten it up good & tight & > that should cure your problem. It did for me. Ray Never use them, they make it worse re maarten > Would putting a spring washer on help? > [quoted text clipped - 4 lines] > > prop. Try just engines, they should have one. Tighten it up good & tight & > > that should cure your problem. It did for me. Ray It sounds like you are running it waaaaay too lean -- especially for a break in. However, get yourself a good 6" adjustable wrench or a box wrench and really tighten up the prop nut. Those four way wrenches are great for plugs, but NOT for props. A jamb nut will also help. Cheers -- \__________Lyman Slack_________/ \______AMA6430 IMAA1564___/ \____Flying Gators R/C______/ \__Gainesville FL _________/ Visit my Web Site at: http://www.LymanSlack.com > Twice now, it has stopped violently and thrown the prop off; actually > breaking the spinner the first time. > CliveK I am not familiar with that fuel but if it is between 5-15% nitro and around 15-18% synthetic or synthetic-castor blend oil, it should be about right. Usually, a four stroke throws the prop because it it too lean or has too much compression for the fuel. I have also seen Saitos that would throw the prop if too rich. I tend to run my four strokes about midway between peaked and slobbering. Sure, it burns a bit more fuel, but the engines like it and they last a long time! -- Paul McIntosh http://www.rc-bearings.com > I'm just running in an OS FS40 Surpass. > [quoted text clipped - 10 lines] > > CliveK |
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