YS 140 DZ life time

[Troy Newman]

Yes sometimes after long number of flights you can take the valves 
out...They will get some carbon type buildup on the stem....actally the 
Exhaust valve....You can scrape it off....I actually will use an x-acto and 
just be careful with it.....Don't mess with the valve seat area...just the 
stem...I have not really had any issue with rust or bearings or anything 
like that...I run only Cool Power 30% heli and don't run it dry or use any 
kind of after run...I just leave the oil and fuel sit in the motor.....Seems 
to work for me...but your milage may vary.

TN


>From: Mr LUMIA <MARC.LUMIA at wanadoo.fr>
>Reply-To: discussion at nsrca.org
>To: "'discussion at nsrca.org'" <discussion at nsrca.org>
>Subject: RE: YS 140 DZ life time
>Date: Sun, 16 Nov 2003 09:00:06 +0100
>
>	Good info Troy.
>
>	What about the cylinder head, including valves ?
>	I found them very dirty after this number of flights.
>	The burning of Cool power fuel "heli 30%(nitro)" inside the YS  leaves 
>some rests on 	both valves.
>
>	Marc
>
>-----Message d'origine-----
>De:	Troy Newman [SMTP:troy_newman at msn.com]
>Date:	dimanche 16 novembre 2003 01:16
>À:	discussion at nsrca.org
>Objet:	Re: YS 140 DZ life time
>
>Top power just like with any other ringed motor will be at about 200
>flights....Once you get over 200 it will loose a little and maintain for
>about another 200-300...The difference is about 200-300 rpm tops....So you
>can get consistent and good power out of the motor for about 300-400 
>flights
>easy.....After that I have found that the ring is all that needs replaced.
>
>If you want that back to the tip top performance you can stick a new ring 
>in
>it now...about $20....
>
>This is about the same life as I found with the YS-140FZ's, 140L's and even
>when I ran the OS 140EFI....
>
>Best power was when things were less than 200 flights....Most people don't
>realize the power loss at the 200 flight mark because they have so much
>extra....But I keep really good tabs on what RPM my motors are
>running....Last year I had a couple motors each with over 500 flights on
>them and when I changed the ring, piston and sleeves the power was back to
>amazing....
>
>The difference is really the difference between the restrictor and not.....
>
>So to answer you question a new ring could be in the near future on the
>motor with about 160 flights...and you are about 1/2 way there on the other
>motor.....They will last long past still making excellent power...but will
>taper off slowly. This is common on all the ringed motors....
>
>
>Now one thing the DZ has going for it...the new piston doesn't get out of
>round as easy as the early relieved and dished pistons on the 120SC, 140FZ,
>and 140L's
>
>So the piston is much more robust on the DZ....By the way this new piston 
>is
>also in the 140 FZ2 (USA-Its the FZ Sport)...This new piston will also fit
>in any of the 140's.....
>
>Plus the DZ is not the high compression and super charged setup that the
>140L is and its better on all the other parts like cam gears and the
>pistons, rings and so on.....
>
>This has been my experience I have 3 motors and been running 2 of them 
>since
>May 2001.....I have about 800flights on one motor, 600 on another and about
>200 on a newer one from this year.
>
>The two older motors have gotten cam gears, bearings, new o-rings, gaskets,
>and pistons, and sleeves as well as the new rings. But these have mega time
>on them and have been excellent running motors....
>
>Another place to look for power loss is in your header and pipe. I thought 
>I
>had a weak motor this past spring...When I changed pipes from a 5-6 year 
>old
>Hatori I gained about 400 rpms.
>
>
>
>Troy Newman
>
> >From: Mr LUMIA <MARC.LUMIA at wanadoo.fr>
> >Reply-To: discussion at nsrca.org
> >To: "'discussion at nsrca.org'" <discussion at nsrca.org>
> >Subject: YS 140 DZ life time
> >Date: Sat, 15 Nov 2003 07:51:52 +0100
> >
> >	I currently use two YS 140 DZ coming from Central Hobbies, no problem ,
> >			very nice engines, running with Cool Power fuel 30% nitro, APC 16*12 
>at
> >			8600 RPM for FAI F3A pattern.
> >First is 160 flights old, second 90 flights.
> >Now the first one seems to loose little power after one year of use.
> >
> >What do you know about the life time of this engine ?
> >Which spare parts have to be changed after which number of flights ?
> >
> >Marc Lumia
> >
> >France
> >
> >
> >-----Message d'origine-----
> >De:	discussion-request at nsrca.org [SMTP:discussion-request at nsrca.org]
> >Date:	mardi 11 novembre 2003 23:58
> >À:	marc.lumia at wanadoo.fr
> >Objet:	Welcome
> >
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