YS .91 AC

[The Hewson's]

Ken
Try it again, but this time stay out of your wife's Cointreau !!!

Alan




----- Original Message ----- 
From: "Ken Velez" <kvelez at comcast.net>
To: <discussion at nsrca.org>
Sent: Saturday, October 22, 2005 7:41 PM
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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