I have a YS63 that has burned @1 gallon of YS20/20 fuel. I use an OS F plug, and an APC 11x8 prop. My problem is idle, from what I've read this engine should idle @ 2000 RPM, the best I can get is 2300, any lower it dies. My max RPM is 11200, which seems good but it smokes alot and it will burn through a 10 oz. tank in 10 min. , what I've read indicates it should last closer to 15 min. but if I try to lean it out any more it won't run. Transition seems good other than smoking it has nice crisp throtlle response. Today when I was at the feild my idle was worse than normal @3000 for a nice steady idle any less and it would slowly drop and end with it stalling. I didn't have any more glow plugs I am going to get some tomorrow, but still the best idle I can get is 2300. Also my field is @ 100 above sea level and is was pretty humid today and 68 F. Does anyone have any comments, this is my first YS engine and I'm tring to learn. Oh yeah valve clearance was .005 so I adjusted to .003 and still no differance. One last thing should I use after run oil? I've been using hobico after run oil, a couple of drops after every use, is this a good idea, or are there better oils to use?

Jeremy

I never try to run them slower than 23/2400. It's almost impossible to get a 63 to run that slow.

The Hobbico oil will ruin all the silicone parts in the engine, if it hasn't already. Do not use it.

How does the engine die, rich or lean? How far open is the airbleed? How far open is the HS needle? Have you adjusted the regulator?

Hi Dave, low speed needle valve is 3 1/4 turns out from closed, high speed needle valve is 1 turn out from closed, and I just threw out my after run oil. I hope it didn't ruin anything, I wish I knew earlier!! How will I know? I haven't adjusted the regulator, still factory set. I'm not sure I know what you mean by how it dies, the motor just winds down from 2500 until it stops, takes about a minute. this is a new problem today before it would run all day at 2300. This is why I thought I had a bad plug.

Screw the idle needle in until it bottoms out, open it 1.5 turns.

Open the HS needle to 1.5 turns.

Open the regulator 1 turn.

Put in a new plug.

Let me know what it does.

ok I will try to get a new plug tomorrow, I'll post as soon as I know. How about after run oil, do you use anything at all, or just run out all the fuel and thats it?

ok I will try to get a new plug tomorrow, I'll post as soon as I know. How about after run oil, do you use anything at all, or just run out all the fuel and thats it?

Most guys run the engine dry and disconnect it from the fuel tank. If you like after run oil, we sell an oil that is compatible with YS engines.

Hi Dave, I adjusted the engine as you recommended, here's what happened, I needed to lean out the high speed to 1 1/4 turns from closed, I left the low speed alone. Idle was still terrible, I would close throttle to 2800rpm and the engine would slowly wind down until it stopped, it took about 45 sec to 1 min. Transition from idle was slow @ 5 seconds to reach top rpm of 1100, What do you think, did I ruin the silicone parts in the engine like you feared?

Jeremy

Maybe.

Why not let our service dept have a look at it. Probably save you a lot of time and frustration.

OK sounds good, could you send me the address and a description of what you will need from me for service.

OK I have a question now, I took my engine off, its mounted on a Pizazz 40, and the aluminum mounting pieces(one on each side bolted to plywood mounts on each side of the engine compartment) were broken, one clean through and the other cracked about half way! I'm not sure but could this effect the engines idle? I know it sounds stupid but I have to ask. Also just for the record this plane has not crashed or even had a bad landing.

Jeremy

You mean the engine crankcase is broken?

FYI...the Pizzaz aluminum engine mounting strips seem to break for many guys. I broke one strip using an Irvine .53 but I didn't notice it until I pulled the Irvine to install my Ys 63. You can buy 1/8" x 3/4" aluminum at many hardware stores. It's a bit beefier than the supplied pieces.

The YS 63 really pulls a Pizzaz nicely!!
Chuck

Hi Dave, sorry for the confusion the engine is fine the mounting strips on the plane cracked.

Hello Dave,
a few messages earlier you informed that the oil of hobbico fuels will ruin the silicone parts.
Are there any other oils known to cause similar problems?
What about additivated (or inhibited) oil types which can neutralise corrosive acids in he exhaust gases.
andré

The only way to know for sure is to take a new diaphragm and silicone o-ring, and soak them in whatever you want to use. If it doesn't damage them it should be OK. We sell a compatible oil if you don't want to risk it.

Hi Dave, I got my motor back today,nice turn around by the way! The engine is running good as new, thanks for all of your help and a speedy repair!

thanks,
Jeremy

Good Flying!

Dave