YS 1.40DZ Questions

[Jim Ivey]

Larry
 You are in the ballpark,however I use a 16.5x12W on my 140DZ and it turns 81-8300. The needle has a flat spot in the adjustment, with an increase in needle, (going Leaner),the rpm doesnt change much.  Adjust to the upper end of this flat spot(leaner). It will use less fuel.
There are different headers. If you have one of the first headers, the header mating flange is milled differently. On this one do not use the copper washer in the head, but use the 2 big copper washers between the header and head.
On the later version header you can use the copper washer in the head and also the 2 big copper washers and the nut will tighten the header to the head. Still use the sealer like you are doing.  The object is to get the header to seat hard against the side of the head,then it will seal.
Hope this helps.

Jim Ivey
> 
> From: "Larry Diamond" <lld613 at psci.net>
> Date: 2005/05/17 Tue AM 09:49:39 EDT
> To: "NSRCA" <discussion at nsrca.org>
> Subject: YS 1.40DZ Questions
> 
> I refitted my Focus with a YS 140DZ. Don't know that I'm getting the power I
> should get. With that said, I now fly with less throttle than the YS 140L;
> 45 degree up lines are now at ½ throttle and vertical lines are about ¾
> throttle.
> 
> Here is my set up:
> 
> 1)	Medium size fuel tubing, new (no air bubbles noted)
> 2)	Power Master 30% DZ
> 3)	APC 17x12
> 4)	NMP Header from Central Hobbies (Having problems stopping the
> exhaust leaks at the head, using Permatex -26B- Red RTV Silicone, rated at
> 650F+).
> 5)	5/8" coupler
> 6)	698 Hatori pipe.
> 7)	Check valve on the vent line.
> 8)	16oz Sullivan fuel tank w/ foam clunk (because that is what was in
> it before. Any recommendation for a 20 oz tank?)
> 9)	Pump is about ½ turn in from flush.
> 10)	Needle is at about 2 turns out.
> 11)	Max ground RPM - 7,900 / Air Temp - 60F
> 12)	Idles -reliably- at 2,600 RPM
> 
> Not necessarily considered broke in yet, 4 tanks ran on the ground
> (following the steps by Don Szczur on Radio South's website) and two flights
> with the Intermediate sequence...
> 
> What prop is being used and what RPM should be expected with PM 30% DZ?
> 
> 

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