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RE: YS CLUB - 4/21/2009 1:52 AM   
Parks


 

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From: Powell, WY, USA
Status: offline 		Cyberwolf,thanks for the 1.40 information.Appreciate it.

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RE: YS CLUB - 4/21/2009 2:18 PM   
Cyberwolf



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From: Blackfoot , ID, USA
Status: offline 		YW guys one of the best sites I have found.
jmcmike your 91 does have the third adjusment for the bottom end, I would run a few tanks through it then do a full adjustment of the needles and reg. The spring in the reg as a rule get weaker with age and use and as a rule make a person go in with the brass screw, yours sounds like it may havea little gunk build up in it from sitting that running might take care of.

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RE: YS CLUB - 4/22/2009 10:41 PM   
g_mkoch


 

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Status: offline 		Hello

I've got a ys-63 wich runs great but there is something that I'm not completly satified with. When the engine spends some time in idle and I hit full throttle it takes about 5 seconds to reach full power. I rarely take it to idle during flight since the airplane that I have it in needs speed (I probably land at 1/4 throttle). The engine won't quit or sputter it only takes too long to accelarate. Can someone tell me if it's the low end needle or the regulator or what? I'm flying with powermaster saito/ys 20/20 and a 13 X 6 APC the high end goes to over 11K and then I take it back 200-300 rpm leaving a nice trail of smoke behind the airplane. Everything else this engine runs great and has lots of power.

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RE: YS CLUB - 4/23/2009 12:55 PM   
Cyberwolf



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From: Blackfoot , ID, USA
Status: offline 		Sounds to me like the bottom end is rich, I would reset it according to the instructs A YS should have instant transistion.
Also to large or heavy of a prop can cause this , you may want to try a Wood or MA prop of the same size or a APC of a smaller size with more pitch. The 63 likes to rev 11-12 K from what I have been told is right at home for them. If memory serves me right I used a 12x8 APC on my 63's with good results.
Good Luck

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RE: YS CLUB - 4/23/2009 3:13 PM   
g_mkoch


 

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Status: offline 		Thanks

I had before a wood prop the same size and gave me the same problem and reduced my rpm by almost 1k.

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RE: YS CLUB - 4/23/2009 7:44 PM   
rlipsett


 

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Status: offline 		run the engine in idle for a while and then shut off the engine. pull the the fuel lines from the tank and see if the pressure of the tank has bled down, but before you pull the lines wait and see if fuel is coming out of your throttle barrel opening. if the pressure of the tank is too high it will flood an engine at idle

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RE: YS CLUB - 4/27/2009 11:38 PM   
jmcmike


 

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Status: offline 		Cyberwolf, started over with my settings and i think im getting there. Idle is good 1900, reg is set flush and i thought i had the top good but mabe to lean.Good smoke on the ground but in the air not much smoke,transition was a little lazy. Propattern 20/20 fuel and f plug with 15-6 apc might need more,also this thing viberates like crazy,ive balenced the prop but cant keep my bolts in my canopy, is this normal? looking forward to more tuning, like the challange and the dare to be different. Thanks again.

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RE: YS CLUB - 4/28/2009 2:16 PM   
rlipsett


 

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Status: offline 		mike if you have a ys 63 the 15 6 prop is too much prop for that engine

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RE: YS CLUB - 4/28/2009 2:25 PM   
qldviking



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Status: offline 		I agree, drop down to a 13 x 6 at least, I am using a Bolly 13 x6 on mine, runs really well

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RE: YS CLUB - 4/28/2009 2:39 PM   
jmcmike


 

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Status: offline 		Sorry guys, should of been clear 91 fz

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RE: YS CLUB - 4/28/2009 3:29 PM   
qldviking



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Status: offline 		in that case you may be a little under I run 16x8 mejzliks on my 2 91fz's

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RE: YS CLUB - 4/28/2009 5:42 PM   
Cyberwolf



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Status: offline 		jmcmike

A 15x6 should be ok. for a 91 FZ where im at ,but at your alt you may get away with a larger prop, the secret is this! prop the engine so it gives you the correct RPM's a 91 should be topping out at 8,000-11,000 RPM's You can prop it so it gives a lower top RPM number as long as the engine doesn't get hot, But don't go over the 11,000 The props recomended
are 13-11-13,13.5-10-13, 14-10-12 No the engine should not vibrate above idle and not much there really, if it does theres something wrong somewhere, could be the tune or it could be something else. Maybe even the plane itself is to lightly built for the YS power.

You may want to cut back to a 14x8 prop and try that just for kicks. Make sure you check your valve clearance also. They set at .004 or 1 MM

Here the way I set my engines . Flame suite on *L*
With the reg screw flush.
I set the HSN first. Set the top end as high as it will go.
Ok then I back off to a idle of 2000 or less and let it idle for say 30 secs or a little more if the engine starts to gain RPM's its lean and bottom end needs to be richened up with the LSN, which will turn CW 1/8 of a turn or less. Small adjustments are needed on a YS
Remember this needle works backwards to most others, as its a airbleed system
After I get a stable idle at 2000 or less RPM's I go back to the top end and get my top RPM's again ,but this time I will back it off maybe 2-300 RPM's a tach works well here and for the 2000 RPM idle .
Ok now we come to the mid range useing the tach again bring the engine up to 4000 RPM's and see what it does ,with the throttle fixed it should maintain the same RPM's if it gains it's lean it it looses and starts to smoke its rich, this can be altered by the brass reg screw ,but a little goes a long ways.

This is where most folks get into trouble with a YS engine, they make a adjustment thinking thats it and there ready to go, WRONG you need to go back and recheck the others you made before to make sure there still the same and have not changed.
Each adjustment on a YS can and will change the others.
Whats very nice about the YS is once you get it set after brake in, Depending on the weather of course, non or very little adjusments have to be made again.

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RE: YS CLUB - 4/28/2009 8:02 PM   
jmcmike


 

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Status: offline 		It spins 9600 on my tach so im not over reving it i dont think.Im going to change the prop to a mabe to slow it down a bit and to see if the vibration goes away. If it dont,what do you think it might be? Hate to send it in, i have always changed my own bearings and ring in my saitos. I have the 91 in my showtime 90 at 8.8 pounds so i think the airframes not to light. thanks for the help

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RE: YS CLUB - 4/29/2009 1:36 AM   
xtraflyr


 

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Status: offline 		Is the vibration only at idle or all the way to WOT? If it's mostly the low end,it maybe a little on the fat (rich) side. I know with the Saito's, thats what fixes it,leaning it out just a bit.. The only YS I ever owned was a 120sf,and it ran like a champ..until it dropped a valve guide into the cylinder..


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RE: YS CLUB - 4/29/2009 2:03 AM   
jmcmike


 

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Status: offline 		XTRAFLYR, idle is not bad,its the top end. Cant keep hold of the high speed needle when trying to set it its so bad. Im going to try a new prop and spinner to see if it helps. Might even call ys to see what he thinks.

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RE: YS CLUB - 4/29/2009 2:21 PM   
Cyberwolf



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Status: offline 		That sounds like a bad prop or spinner to me , all my engines smooth out above a idle.
I have 3 YS 91's 2 which are FZ's and they both run smooth through out the entire range of rpm's. Has anyone taken the engine apart, like maybe the cam?

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RE: YS CLUB - 4/29/2009 11:44 PM   
jmcmike


 

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Status: offline 		I bought it used off the universe so i dont know its history. I did adjust the valves and pulled the back cover off to look at the rear bearing and it looked good. I put a new tru turn spinner on that i did have to grind a little to get the prop to fit, mabe that it. Ill try to run it again this weekend without the spinner see if that might be it and try a 15-8 or a 16-4w prop also. Do you think the cam is bad or off a tooth?

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RE: YS CLUB - 4/30/2009 1:38 PM   
Cyberwolf



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Status: offline 		I was thinking maybe off a tooth, but I would doubt it would spin that large of a prop to those figures if it was. But again that could explain the slow transistion if it was a tooth off in time. Heres another thought does the spinner run true or does it wobble a little at idle? I'm talking the very tip where the screw goes in.

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RE: YS CLUB - 4/30/2009 5:14 PM   
jmcmike


 

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Status: offline 		Im going to play with it sunday when i get back home,up in the snow in montana right now! Ill start with a new prop and no spinner and see were that goes,also ordered new diaphram,mine is warped,new plunger,spring and gasket kit. The transition was slow off idle but mid up was fast,i think the tune isnt there yet. Nobody at my field runs one of these, think if i saw one run i would have a better idea what it should be doing. Thank again

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RE: YS CLUB - 4/30/2009 6:35 PM   
Cyberwolf



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Status: offline 		Snow in Mont eh , to bad your not here in Idaho id show you what one of these runs like *L*

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RE: YS CLUB - 5/5/2009 3:23 PM   
chuck993


 

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Status: offline 		Hey folks, I have a YS110, an older one, that was rebuilt by YS last summer, I run a 16x6 on it, does anyone know what RPM I should get for that and what the high speed should be at...ie 2 turns etc?

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RE: YS CLUB - 6/20/2009 12:06 AM   
g_mkoch


 

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Status: offline 		I Just saw the add for the new YS 70, does anyone have any information. Looks great, I wonder how the new regulator works and how much more power it gives compared to the 63s.

Best Regards

< Message edited by g_mkoch -- 6/20/2009 3:11 PM >

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RE: YS CLUB - 7/4/2009 3:52 AM   
pencon


 

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Status: offline 		Hi Folks I just bought a YS 120 SC at a swap meet and was wondering if it's normal to have low compression when turning it over by hand ? I haven't gotten around to running it yet ...Hopefully the ring isn't pooched .Maybe the compressioin will come back after a run? (carbon stuck in the valve set etc )Is the SC a pain in the Butt to tune like I have heard?

< Message edited by pencon -- 7/4/2009 6:32 AM >

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RE: YS CLUB - 7/4/2009 6:51 AM   
Barry Cazier


 

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Status: offline 		My YSs seem to have fairly low compression when turned by hand. I would say it's normal. When you add fuel to it and run it, it will perk right up is my guess. I wouldn't worrry about it, not yet.
Thanks
Barry


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RE: YS CLUB - 7/4/2009 11:09 AM   
xtraflyr


 

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Status: offline 		I know when my DA50 lost compression,DA told me that it won't have compression or seem low on compression until you get some oil into the cylinder. So I was running mine to lean and it was loosing compression and heating up.

My friend also has a YS 120 that always seemed low until he started it up,then it ran fine...


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