YS 60 fuel feed problem - RCCanada - Canada Radio Controlled Hobby Forum
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Old 12-25-2004, 02:34 AM   #1
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I am: Eduardo Galiano
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YS 60 fuel feed problem

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Here's the situation: I Just purchased a 2 cycle YS 60 rear exhaust w/ pipe on a nice pattern plane. The seller told me that the bearings had been replaced. I fueled it up and when I crank the engine manually (without a glow battery) I don't see any fuel moving into the carb. I tried blowing into the carb as hard as I could, and apparently nothing, with the carb wide open of course. Is this normal on this engine with the diaphragm pump and check valve system? Is it perhaps that the only way to get the fuel flowing is by turning the engine over rapidly with a starter? Or may there have been a problem putting the engine back together after changing the bearings, such as damage to the diaphragm? Any help would be appreciated.

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Old 12-25-2004, 09:56 AM   #2
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1. I've been running the YS .45, your .60's little brother, for about ten years now. It's an amazing engine with lots of power.
2. The fuel pump/needle valve system is not like other normal engines. Don't expect it to act like normal engines. It is designed and optimized to run under the full power of that pump, and that pump and check valve is is integral to the way the engine gets its fuel. The pressure delivered by that pump is MUCH, MUCH greater than you can deliver with your mouth. My .45 squirts fuel over 3 feet straight out of the fuel tube after a flight, and some folks report that their pump has burst a fuel tank with its pressure. I believe it.
3. Anyway, the way to start this engine is to PRIME IT. To my knowledge, that's the only way to get fuel to the engine before start. You will only have to do this for the first flight of the day, then there should be enough fuel for your other starts.
4. Here's how I start mine, if it hasn't been started in a while:
- Make sure the check valve is inserted the right way. The diagram shown in the engine's user's manual is deceiveing and I've gotten it wrong myself.
-Close needle valve all the way, then open about 1.5 turns. (Again, this is less than most sport engines. This engine stops if run overly rich, too much fuel pressure.)
- Prime the engine, about 3-5 drops right into the carb. Turn the engine over (by hand, with the glow clip OFF!)
- Start it with throttle set anywhere from idle to 1/4 throttle, let it warm up for a few seconds, then remove the glow clip and slowly increase the throttle. If the RPM's don't increase or decrease prior to reaching full throttle, then close the throttle, lean the needle valve a click or two and slowly advance the throttle. Do this until you can reach full throttle with increasing rpm.
- Once you have it started, stand back in awe of this bad boy and smile, you'll be amazed at the power.

This has been my experience withthe YS engines, but I'm not an expert. BTW, these engines don't mind a little nitro and like expensive competition props.

Good luck!


(Edited by Wayne - added prime procedure and other minor details)
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