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05-27-2007 05:44 AM  13 years ago
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GScott

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Lewis Center, OH

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Tuning a YS50
What's the trick to tuning the YS50. I'm running one I purchased a few weeks ago and I'm finding it hard to tune. I'm 1 turn out on the low and between 1.5 and 1.75 on the high. It's pretty warm so I'm afraid to lean it out any further. It seems to need to idle higher than a Hyper to keep it running. I'm also getting surging and overspeeding on my governor after coming out of a flip or collective pump. Not sure if this is related to tuning or more in the governor. The engine is in a Knight 3D and I'm running a MP2. Any suggestions?
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05-27-2007 06:36 AM  13 years ago
tadawson

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Lewisville, TX

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I found I needed to lean out my low end quite a bit to get a stable idle and clean transition, and then set the main a couple clicks lean of the recommended starting settings. I get about 195 degrees on the head in flight, good throttle response, and great power. The main thing for me was needing to lean out the idle quite a bit . . . (and needing to reprogram the throttle end point, since the idle speed came up so much from the starter setting . . ). I run with a GV-1, and no surging, hanging, or any other odd behaviour - it just sings!

- Tim
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05-27-2007 04:07 PM  13 years ago
GScott

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Lewis Center, OH

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What temp should I be aiming for after a hover? As I understand it the low needle on the YS50 is set for hovering. Should I be checking the head temp or the back plate temp? Checking the backplate temp is not as easy as the Hyper since the pressure outlet is right in the middle.
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05-27-2007 10:43 PM  13 years ago
tadawson

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Lewisville, TX

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No! The ONLY needle on the YS50 is set for both hover and fast flight. The other screw is JUST for idle! The instructions are a bit vague, but if you read closely, they give two sets of adjustments that reference the single needle . . . This is probably why you are having problems . . once you get into a hover, the idle needle is pretty much ineffective . . Can't really give you temps specifically in hover, since the Venom only saves peak, but I would think 180 - 190 would be about right, based on what I am seeing (I am not a severe flyer, so my fast flight and hover temps are likely pretty similar . . )

- Tim
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05-29-2007 12:05 AM  13 years ago
CustomPC

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Sydney, NSW - Australia

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My personal experience with the YS50 is that there is quite a lot of interaction between the two needles.

I've found thay if i richen the low i need to lean the high, and vice versa.

Last time out i had it running very well with the low about 1/16 of a turn richer than it came from the factory and the high 1 full turn and 7 clicks (1 click above 1 1/4) out.

My backplate was very warm to hot at these settings. I can hold my finger on it for about 7-8 seconds. It starts and idles well and throttle response is good.

I'm running 20% nitro and a 20% coolpower MV mix (11% red, 9% blue).
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