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Century Helicopter . MTA Hobbies . Model Rectifier Corp

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HIROBO Freya - Sceadu - Shuttle > HAD ENOUGH OF MY EVO 90!!
 
 
WreckRman2
Key Veteran
Location: Indianapolis, IN

I have a little over a gallon in my new Evo 90 w/ YS91 and have no bad habits at all. In fact I've loving it... ALOT!


http://www.rchangout.com/gallery/sh....php/photo/5257

________________
David Smith
317.777.3230
Trex 600n Pro, OS50 Hyper, Align Pipe, GY611, GV1
03-20-2006 Over year old.
 
 
DKflyer
Senior Heliman
Location: Huntington, WV

I had something that sounded really similar with an X-Spec I used to own. It made this really terible vibration/sound at low RPM and at idle. I couldn't find anything wrong. Someone told me to check the bearing in the motor (a fairly new YS .91). It was shot. I had it replaced and the problem was solved. I have since had another YS .91 that had a bad rear bearing early on, so I think it is pretty common. I replaced it with a Boca ceramic and haven't had any problems since. It isn't hard at all to change the bearings.

It's probably worth checking if you haven't found anything else wrong.

I love the YS engines, but I just expect to replace the bearings early on.

DK
03-20-2006 Over year old.
 
 
MEDFLIGHT
Veteran
Location: South Webster, Ohio

Yesterday I swapped out the entire Evo main mast/ head assembly with the one in my standard Freya and it made a very noticeable improvement. Since I've already replaced the spindle, fly-bar, and main shaft, I'm going to change the head block and see what happens. Is there anything between the swash and head button that could be assembled incorrectly that could cause a vibration?
03-21-2006 Over year old.
 
 
SolarXtreme
Veteran
Location: Arroyo Grande, CA

Quote 
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.


You are complaining about low end engine vibration and you are changing out main shaft bearings??? Obviously it is an engine related problem. You can change the bearings very easily you don't need to send the engine back to YS. At least that is where I would start.
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I picked a hell of a day to quit drinking

Avant EFX
Freya EVO
03-21-2006 Over year old.
HOMEPAGE  
 
 
MEDFLIGHT
Veteran
Location: South Webster, Ohio

Solar, the engine does hum but I've been told that is typical of a YS 91. I don't know, this is my first 90 size heli. If you were in my shoes, you'd understand that it's not that obvious. All I was trying to do by swapping the head assemblies is isolate the problem before I go buying a bunch of parts that may or may not fix the problem. I also swapped entire tail boom assemblies, which made no difference at all.
03-21-2006 Over year old.
 
 
Captain
Senior Heliman
Location: Milroy,Indiana

I think you've been told about the hum being typical, is because most YS 91s needed a rear bearing. If the EVO has not been dorked I doubt the problem is in the mechanics. Is the clutch dialed in to specs? My money is on rear bearing.

Captain
03-21-2006 Over year old.
 
 
MRC-Hirobo
Key Veteran
Location: Edison, NJ

Feel free to give me a shout at 732 225 2100 ext 230.

If need be, you can send the motor here to be looked at and dialed in if necessary.

Is the tank foaming a lot?

Before you go buying a bunch of new parts, give me a shout or email me your number at jeff@modelrectifier.com.

I am here to help you figure this out.

Jeff


- Dan G. -
03-21-2006 Over year old.
 
 
Wa11banger
Elite Veteran
Location: Huntsville, Al

Bamm!!! Now thats what everyone is always talking about.. Great customer service, Kudos Jeff.

BTW this is not a paid advertisement. I do not even own a single Hirobo product. Just very impressed with his "I am here for you" attitude time and time again!

Rick.

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, and KBDD teams
03-21-2006 Over year old.
HOMEPAGE  
 
 
WreckRman2
Key Veteran
Location: Indianapolis, IN

Quote 
I do not even own a single Hirobo product.
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What are you waiting on? LOL

________________
David Smith
317.777.3230
Trex 600n Pro, OS50 Hyper, Align Pipe, GY611, GV1
03-21-2006 Over year old.
 
 
DKflyer
Senior Heliman
Location: Huntington, WV

Quote 
Solar, the engine does hum but I've been told that is typical of a YS 91. I don't know, this is my first 90 size heli.



It's only typical if it has a bad bearing or is badly out of tune. It should run like a sewing machine if everything is OK.
03-22-2006 Over year old.
 
 
RCtaz
Veteran
Location: Leander, TX

Changing out the rear bearing with a stock one will cost you less than $20 and a little bit of time. Its simple to do and if you have 4 gallons on that YS its prob about time for one regaurdless.

Mike

~Texas Renegade Rotorz~
03-22-2006 Over year old.
 
 
MEDFLIGHT
Veteran
Location: South Webster, Ohio

I'll probably end up changing the bearing but I'm going to give Jeff a call first. About a year ago he helped me with a problem I had with an Evo 50.

I've changed bearings in some OS engines without any trouble. Obviously there is a little more to the YS but I shouldn't have any trouble.
03-22-2006 Over year old.
 
 
mrNoodles
rrProfessor
Location: Borlänge, Sweden

Try to get some help from any nearby YS owners.
Since its you first 90 and so on.
03-22-2006 Over year old.
HOMEPAGE  
 
 
MEDFLIGHT
Veteran
Location: South Webster, Ohio

mrNoodles, I wish that was an option. The nearest YS owner I've been able to find is at least two hours away, maybe further. I spoke with Jeff Green today and he gave me a couple things to try but the weather isn't being very helpful. As soon as I get a chance to try his suggestions I'm going to call him back with the results. He is confident we will find the problem.(I am, too)
03-23-2006 Over year old.
 
 
Havoc
Key Veteran
Location: Ky.

Mine is YS
03-23-2006 Over year old.
 
 
MEDFLIGHT
Veteran
Location: South Webster, Ohio

You and another guy in Columbus are the ones I was talking about.
03-23-2006 Over year old.
 
 
Havoc
Key Veteran
Location: Ky.

Oops, I guess I am that far away. It's been awhile since I've been up there.
03-23-2006 Over year old.
 
 
mrNoodles
rrProfessor
Location: Borlänge, Sweden

2h drive

Ah oki then I understand
03-23-2006 Over year old.
HOMEPAGE  
 
 
WreckRman2
Key Veteran
Location: Indianapolis, IN

How far away from Indianapolis are you? We have a few guys running the YS91 on the Evo here including myself.

________________
David Smith
317.777.3230
Trex 600n Pro, OS50 Hyper, Align Pipe, GY611, GV1
03-23-2006 Over year old.
 
 
learmd
Senior Heliman
Location: West Palm Beach, FL

imo a 2 hr drive to spend some time with other heli addicts and the first hand help in person seems like its worth the tank of gas and time considering start buying parts might be well over what you would spend in gas

crashes sponsored by VISA, MASTERCARD, and AMEX.. just like your heli.. never leave home without it
03-23-2006 Over year old.
 
 
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HIROBO Freya - Sceadu - Shuttle > HAD ENOUGH OF MY EVO 90!!
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