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RE: YS CLUB - 7/7/2009 4:55 PM   
Cyberwolf



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From: Blackfoot , ID, USA
Status: online 		One thing to worry about with the SC is do not run it out of fuel at high rpm's like in flight !!!!! and no there not any harder to tune than any other YS engine. In fact there the first to have the low speed needle set up. As Far as compression goes my SC has tons when flipped over by hand, but I have seen others that didn't have much and ran fine. Just for a ref MY SC will turn a 16x8 apc at over 10K with 15%x20% fuel very strong runner. So if you are somewhere in that area you should be good to go.

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RE: YS CLUB - 7/16/2009 5:06 AM   
Parks


 

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From: Powell, WY, USA
Status: offline 		Just a note that may be of general interest to YS owners.
YS Parts and Service does great work. Received,checked,cured,and returned a new YS 1.40 Sport in less than ten days.
Warms the cockles of a modeler's heart.

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RE: YS CLUB - 7/17/2009 6:09 PM   
Cyberwolf



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Status: online 		Yes, I fully agree I have full faith in Richard and his trained staff they know there stuff when it comes to a YS engine. Also they have been more than helpfull with just a phone call to help sort some minor things out. I'm glad someone else feels the same way .

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RE: YS CLUB - 7/17/2009 6:51 PM   
jmcmike


 

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From: Carefree, AZ, USA
Status: offline 		cyberwolf, i finally sent my 91fz to richard to have him and staff check it out. I told them i was not in a hurry so the 34 day turn around was not a problem. Bearings,lap the valves,all the fuel stuff, and gaskets. Nice to see all of the old parts came back with the motor to inspect. The price was very reasnable and it was nice to talk to the man. Hope to get it back in the plane this weekend and try it out! Will keep you guys posted.

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RE: YS CLUB - 8/18/2009 10:41 PM   
Union Models


 

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From: Manchester, UNITED KINGDOM
Status: offline 		Hi guys, wondeing if you could help out,

I have a YS63 FZ S which has run around 2 gallons of Model Technics YS20/20 fuel.

When the engine is tached at 3500rpm it holds steady for 60 seconds, however, If I pick the model up holding at 45 deg, the engine stops after a few seconds.

Another intersting problem is, if the engine holds 2000 rpm for 60 seconds, then advance the throttle, the engine hunts or coughs quickly. I've been all through the regulator settings, a 1/32 turn at a time, and I just cant stop the engine from cutting 3500 rpm when held at 45deg ?

The tick over is okay, model can be held verticle at 2200rpm and hold tick over.

I have white smoke more at half throttle, a little less at full power.

Would you have any suggestions at to what I can try please.

My settings are as follows:
Prop APC 12x7
engine is inverted in model
new YS 4 stroke plug
Fuel YS 20/20 or Optimix 20 fourstroke
reg set 1/2 turn in from flush
high speed needle 2 turns out
low speed needle 3 turns out

Kind regards

Mike

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RE: YS CLUB - 8/19/2009 2:43 AM   
rlipsett


 

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Status: offline 		sounds like your low end is a little lean. turn the needle valve in a little at a time. the ys engine acts the same way as an air bleed screw. Unless that engine is leaving a trail behind it then you are running it too lean. Ys like to be a little rich. after you set up a good transition from 2000 rpm to full throttle you can start adjusting the pressure regulator. let it run at 3000 to 3500 for about 15 seconds and then fire wall the engine, if it coughs then turn the screw out a little, if it sluggishly increases then turn it in a little.

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RE: YS CLUB - 8/19/2009 11:28 AM   
Union Models


 

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Status: offline 		Rlipsett, thanks for your post.

I was on the understanding the low end needle only came into play at 2000 - 2400 rpm ? anything 2500 - 4000 rpm is the regulator, above that is top end needle, am I right or mislead ?

Someone else mentioned try adjusting the low end needle, although I though as it cuts at 3500 rpm its way above the lowend setting having any effect ? At present, the low end is set quiet lean 3 turns out.

thanks
mike

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RE: YS CLUB - 8/20/2009 3:42 AM   
rlipsett


 

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From: hingham, MA, USA
Status: offline 		all three adjustments effect one another. and must be set in the proper order. since your engine is inverted the pressure regulator should not be so high that fuel will free flow out of the air intake after the tank is pressurized. flush is a good setting to start with, if the settings are too far off to start with you will be chasing a setting that will not work out too good in all situations, this is the one evil problem with the ys on an otherwise great engine. you are right about the 2000 rpm and below being for the low end adjustment and 2500 and above to be a good point to start adjusting the pressure regulator but as I said all three adjustments will interact with one another. If pressure is started too low you have to open the high speed to large and then if you get the low right for that point then the midrange suffers but when you adjust the mid the high end goes out and you start chasing the settings. Start by flush screw setting regulator and factory setting the low and high to default settings. Run the engine for a few seconds and make sure the fuel does not free flow out of the air intake. Adjust until free flowing stops. Run at high speed and lean out till you get max rpm and then back off about 4 clicks on the rich side. Adjust the low end below 2000 rpm so that after everytime that you clean out the engine after a test and let it sit at idle for 20 seconds. If too rich the engine will bog down and slowly accelerate as fuel burns off, adjust by turning screw outward. If too lean the engine will cough or stumble, you adjust but turning the screw in. At this point you are almost home free. Clean out the engine with a high speed run for a few seconds then drop to higher then 2000 rpms zi like around 3000 and let it settle in for 20 seconds then firewall the engine, if it bogs then the regulator is too rich if it coughs it is too lean adjust accordingly cw to lean it and ccw to richen the mid range. You should be all set now just double check the low end and transitions and all should be fine.
one final thing too mention I have never had good luck with ys plugs. type f plugs have always worked superiorly for me. the ys plugs I have always had idle problems with

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RE: YS CLUB - 8/20/2009 10:58 AM   
Union Models


 

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Status: offline 		Rlipsett, thanks, i'll go away and run the engine and report how I go on.

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RE: YS CLUB - 8/21/2009 3:58 PM   
Union Models


 

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Status: offline 		Rlipsett,

I changed plugs to a new OS F type, set reg flush, other needles as per instructions. Previously, I was chacing settings as you mentioned.

with your setup notes to hand, I followed your setup procedure. The engine now runs well, I've flown 3 tanks out, no problems, tried to upset the engine in flight with flicks, spins etc... it just keeps going

Thankyou for your help, I grately appreciate it, and for helping to get a better understanding on the YS's.

Mike.

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RE: YS CLUB - 8/21/2009 5:32 PM   
rlipsett


 

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From: hingham, MA, USA
Status: offline 		You are welcome and congratulations on figuring out the engine, The setup instructions for that engine are not the greatest when it comes. to the pressure regulator. I would have always though that the ys plug would have run best in that engine but they caused nothing but grief for me for 4 months when I changed from the easy to buy f at the lhs to the ys ones I bought from a dealer when I bought a new engine one time. Since now you know how to set up the engine here is one more hint for when the engine starts to run bad and it varies settings widely from one day to another. The secret is the diaphram on the pressure regulator has worn out and has a pin **** hole in it that you might not be able to see. I have only ever reset and checked valves at the beggining of the flying season during the preseason check outs and my 6 year old engine during these checkouts only needed to be adjusted about 3 times, with one set of bearings thrown in, a rock solid reliable engine

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RE: YS CLUB - 9/6/2009 8:51 AM   
awd


 

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From: adelaide, AUSTRALIA
Status: offline 		Hi All

I was wondering if some one could give me a hand and tell me what size bearings go on the YS FZ91 I would like to get new ones and some
game me the engine free but with no bearings so I need to purchase them and dont know the correct size.

thanks for any help

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RE: YS CLUB - 9/6/2009 5:04 PM   
Cyberwolf



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From: Blackfoot , ID, USA
Status: online 		Hello you will need one each 1 x 15x32x8 (16002) and one each 1 x .375x.875x.281 (R6-2RS) also if want to change the cam bearings the number is 2 x 5X13X4 (695ZZ)
All of theses bearings and more can be found at RC bearings.com for a very reasonable price, Good luck.
You also may wish to change out the reg diaphram,plunger and spring while your at it plus all new gaskets and orings, which can be obtained at central hobbies.com

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RE: YS CLUB - 9/7/2009 2:23 AM   
jmcmike


 

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From: Carefree, AZ, USA
Status: offline 		Hey guys,

Is there a difference in carbs on a .91fz to a .91ac. I know the needle valve assemblies will interchange but is there a difference in carbs. I have mine for sale and somebody asked about the carb. thanks guys

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RE: YS CLUB - 9/7/2009 6:45 AM   
Cyberwolf



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From: Blackfoot , ID, USA
Status: online 		Yes there is a difference the AC has a smaller inlet as to weather it will interchange with the FZ i'm not sure. The porting on the disk may be different.

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RE: YS CLUB - 9/8/2009 11:48 AM   
awd


 

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Status: offline 		Thanks Cyberwolf went and ordered a set from the bearing mob you put down good price and great info.

all the best awd

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RE: YS CLUB - 9/29/2009 11:22 PM   
Union Models


 

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From: Manchester, UNITED KINGDOM
Status: offline 		Hi Guys,

Does anyone know if theres a suitable tuned pipe for the YS63 FZ other than the hatori 643 ridged short header and hatori 640 cooiling short pipe.

I'm looking to use a Hatori 577 standard long flexiable header with a suitable 13" long tuned pipe. This is to fit the YS63Fz, planning on installing in a Hanno Prettner ARTF EZ Mystic 90. Model has a hollow under wing for a long tuned pipe.

All I need is a suitable part number for the tuned pipe.

Thanks
Mike

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RE: YS CLUB - 10/14/2009 1:31 AM   
PatternFlyer



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Status: offline 		Mike,
I just sent you a reply to the PM.
I may have more than one Hatori pipes.

Ihncheol


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RE: YS CLUB - 12/6/2009 7:16 PM   
Kostas1



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From: AthensAthens, GREECE
Status: offline 		Hi all !

I recently got a used YS 63FZ engine and i wish to know if it will be enough for sport flying on a 10-11lb airframe.

If yes,

then what prop ?

Thank's a lot

Kostas

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RE: YS CLUB - 12/7/2009 9:03 PM   
Cyberwolf



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From: Blackfoot , ID, USA
Status: online 		While a 63 is a powerhouse I think that is asking just a bit much of it.

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RE: YS CLUB - 12/8/2009 12:58 AM   
wildnloose


 

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From: Owasso, OK, USA
Status: offline 		I do agree its asking a bit too much, but actually its not that bad with an 8+ pound plane. I put it on my H9 60 sized Mustang just for grins. I did not weigh it, but it performed rather well, probably more scale than any of the other engines I had on it. Flew with a 13x6 apc prop on 30%heli fuel. What I really liked is that its much easier to take off of our thick grass with the lighter motor up front, less tip stalling.

Its still lacking a little but I had fun with it....but c'mon, a Stang is supposed to fly fast.

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RE: YS CLUB - 12/11/2009 12:13 AM   
Union Models


 

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Status: offline 		Kostas,

For a model weighing 10 ilbs I think a YS110 or a YS140 would be better suited.

For Patton models, a YS63FZ may struggle on a airframe weighing more than 6.5 ilbs. However I'm sure theres others who may disagree.

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RE: YS CLUB - 12/11/2009 10:18 AM   
Kostas1



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quote:

ORIGINAL: Union Models

Kostas,

For a model weighing 10 ilbs I think a YS110 or a YS140 would be better suited.

For Patton models, a YS63FZ may struggle on a airframe weighing more than 6.5 ilbs. However I'm sure theres others who may disagree.


Yes i understand!
I am asking too much, i know!

It was the fact that i bought it for a Seagull PC-9 40 size ARF but then thought of my other *upcoming* project from new year!


Actually,
what prop to use on the YS 63FZ/PC-9 combination?

An APC 11x10??
And in what rpm?

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RE: YS CLUB - 12/11/2009 6:58 PM   
Barry Cazier


 

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Status: offline 		My YS63 on 30% Cool Power and an APC 13/6 prop puts out 8.5lbs static thrust. Quite a little power house. I'm certain it would flyl a 10lbs plane put obviously it won't hover it. My 110s put out 13lbs 4ozs of thurst using 30% Cool Power and APC 16/6 prop. I like to fly a 9lbs plane with those.
My elevation is 4800'. So Maybe a little bit more if your elevation is lower.

I haven't done any thrust tests on the 140. I'm guessing it would be 16lbs or so. \

Thanks
Barry


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RE: YS CLUB - 12/11/2009 7:24 PM   
Kostas1



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Status: offline 		Well,

i am more interested in sport flying and that's why i asked about the YS 63FZ vs 10-11lb.

Do u remember rpm's on the 13x6 ?

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