YS .91 AC

[Jim Ivey]

 Ken 
Sounds like air leak to me. Install new gasket set and see what happens. 
Jim Ivey
> 
> From: "Ken Velez" <kvelez at comcast.net>
> Date: 2005/10/22 Sat PM 07:41:55 EDT
> To: <discussion at nsrca.org>
> Subject: YS .91 AC
> 
>   Hi guys, I picked up a YS .91AC some time back. I finally got an airframe
> for it, but ran into some problems and I have no clue what can be causing
> it. So I figure ask the experts out there before spending money on parts not
> needed. The problem is that from 1/4 power to 3/4 the engine surges, not
> just a little but quite extreme. 1000 or better rpm difference and the
> higher the throttle the bigger the difference. When  I first got it I took
> it completely apart and inspected it, all seem good so after cleaning it I
> re assembled it using a new set of o-rings, new diaphragm, plunger, spring
> and actuator. The gaskets seem all right so I re used the original ones
> (maybe that's the problem). What's really throwing me off is that it idles
> PERFECT and I mean it will hold 1600 r's for ever and at full power is also
> as expected. Compression is very good, bearings are smooth, valves
> calibrated, regulator it doesn't care where it is. I have tried full out to
> all the way in. It seems not to change much (currently it is flush with the
> case). So what's happening in the middle? It's got me baffled. Thanks in
> advance.
> 
> Ken Velez
> 
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