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Futaba-RC . Fast Lad Performance . Esprit Model

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HIROBO X-spec - Freya - Sceadu - Shuttle > HAD ENOUGH OF MY EVO 90!!
 
 
MEDFLIGHT
Veteran
Location: South Webster, Ohio

I bought a new Evo 90 and YS 91 last August and have been fighting a bad, side to side, high freq vibe ever since. The blades have been balanced several times (main and tails), replaced the main shaft, dial indicated the cluth shaft and hub (x2), balanced fan, tightened belt, tried another set of blades, played with the needles, and installed a boom support bridge. The bridge is the only thing that reduced the vibe but it just hides it a little. The vibe is so bad that the bridge will slide forward about an inch and a half. I'm starting to see the black residue, that vibrations cause, in several places.

Getting a new engine or buying parts and guessing isn't an option. My pockets have bottoms and, quite frankly, I'm tired of screwin' with it. After all of this, I think the problem is the engine (which has about 4 gallon through it). At an idle, it "hums" so bad it is hard to get a screwdriver in slot to adjust the low speed needle. The screwdriver dances all over the place. I really hate to take it out (again) and send it back to YS, just to be told there is nothing wrong with it.

Sorry about this post, but I am totally frustrated. I can see this heli setting on the shelf for a long while.
03-18-2006 Over year old.
 
 
SolarXtreme
Veteran
Location: Arroyo Grande, CA

Where are your needles? What exhaust are you running? If your engine is badly tuned you will have severe vibration issues.
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I picked a hell of a day to quit drinking

Avant EFX
Freya EVO
03-18-2006 Over year old.
HOMEPAGE  
 
 
SolarXtreme
Veteran
Location: Arroyo Grande, CA

It is also possible your bearings could be shot in your YS. I replaced mine at about 150 flights due to a weird noise and related vibration. After changing them out I have almost 500 flights on the ship and engine without issue.
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I picked a hell of a day to quit drinking

Avant EFX
Freya EVO
03-18-2006 Over year old.
HOMEPAGE  
 
 
Havoc
Key Veteran
Location: Ky.

Bring it down here and let me take a shot at it.
03-18-2006 Over year old.
 
 
MEDFLIGHT
Veteran
Location: South Webster, Ohio

I'm not sure about the exact needle setting, but the engine is running slightly warm on the back plate and making good power. The exhaust is an SB-16. The engine was bought new last August with the heli. If the bearing are bad, they were bad when they were new.

Havoc, I might have to take you up on your offer.
03-18-2006 Over year old.
 
 
Quickster
Senior Heliman
Location: Victoria,Australia

Has it been like this since day one? Or has it slowly developed. I say this because some 91's run smoother than others. I have had two motors the same and one ran smooth and the other would vibrate the heli off the bench!
03-18-2006 Over year old.
 
 
carcrasher
Key Veteran
Location: east coast

Try changing out the bearings or try another ys and see what happens.
03-18-2006 Over year old.
 
 
Heli-pres
Senior Heliman
Location: Pleasant, Grove. UT

YS 91

When you installed your fan and collett, did you make sure the collett slit was not over the slot in the crank for the key? If the collett slit is sitting over the key slot on the crank it can cock the collett slightly causing a slight wobble in the fan, you may not even notice just looking at it. Also when you installed the fan on your motor, did you use a crank locking tool? If so how much force did you apply tightning the nut. If you use to much force you can bend the Piston rod. Just curious questions
JOHN

Quick UK Flight Team
03-18-2006 Over year old.
HOMEPAGE  
 
 
Henrik Engert
Veteran
Location: Round Rock, TX

I think the YS engine vibrates a lot at idle, at least mine does.
03-18-2006 Over year old.
 
 
MEDFLIGHT
Veteran
Location: South Webster, Ohio

Yes, It has been like this from day one. We first thought it was because it was running rich but it didn't get any better as we leaned it out.

I'm 99% sure the slit isn't over the keyway. I used a tooth brush to lock the engine. I got it good and tight but didn't crank down on it or anything like that.
03-18-2006 Over year old.
 
 
MEDFLIGHT
Veteran
Location: South Webster, Ohio

This one vibrates alot more than my OS 50 and 60.
03-18-2006 Over year old.
 
 
BarracudaHockey
rrMaster
Location: Orange Park FL

I'd sell it. Cheap.

I'll pm you my number!

Seriously, pick up the phone and call Jeff Green, I got him on the phone first try for a problem I couldn't solve with a Shuttle.


AMA 77227
http://www.jaxrc.com
03-18-2006 Over year old.
 
 
RCtaz
Veteran
Location: Leander, TX

Just a thought but you said you have 4 or so gallons through the YS?? and it has a "humm" even idleing???? I bet you need to replace the rear bearing in the thing! They are bad about not lasting long and if the motor sat around for a while before running it I would at least check it out.

~Texas Renegade Rotorz~
03-18-2006 Over year old.
 
 
mrNoodles
rrProfessor
Location: Borlänge, Sweden

Try the EVO with a new/another/rebuilt engine.
03-18-2006 Over year old.
HOMEPAGE  
 
 
bald eagle
Veteran
Location: detroit michigan

i am in michigan and i can help if you want

thank jeff
03-18-2006 Over year old.
 
 
rdalcanto
Key Veteran
Location: Salt Lake City, UT

If it is vibrating that bad when it is idling, the problem is clearly not with the EVO, but the engine or collet/fan assembly. It sounds like there are a few people who may be fairly close to you that are willing to help. If you are out of ideas, it may be worth seeing what they can figure out.

Rick

Team MRC & Magnum Fuels
03-18-2006 Over year old.
HOMEPAGE  
 
 
929pilot
Senior Heliman
Location: Jackson, OH

I vote for new bearings...smoothed out my ys61 big time.
03-19-2006 Over year old.
HOMEPAGE  
 
 
nighttrain
Senior Heliman
Location: Louisville KY

Bring it on down to Louisville, I'll help you. Doug
03-19-2006 Over year old.
 
 
MEDFLIGHT
Veteran
Location: South Webster, Ohio

Just for the fun of it, I'm going to swap tail booms with my other Freya. If that doesn't work I'm going to try swap the entire main mast/head assembly. This way I will for sure know if it is the engine stack or heli. Don't know why I didn't think of this earlier:confused

Thanks for the offers to help, guys. Nice to know there are people out there willing to lend a hand. I'll keep you all in mind. If swapping the assemblies and maybe the bearings doesn't work, I may be contacting you.

Thanks to everyone for your suggestions.
03-19-2006 Over year old.
 
 
Captain
Senior Heliman
Location: Milroy,Indiana

Not sure where your town is, I'm half way between Cinn and Indy with private flying field. When the weather decides to stay warm bring it over, we can sort it out. I have same setup, very SMOOTH... Would hate to see you trade down and regret it. Doug

Captain
03-19-2006 Over year old.
 
 
3 pages [ <<    <    ( 1 )     2      3     NEXT    >> ]2965 viewsPOST REPLY
Thunder Power RC . Real Raptors . Mikado Modellhubschrauber

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HIROBO X-spec - Freya - Sceadu - Shuttle > HAD ENOUGH OF MY EVO 90!!
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