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ys 91 engine help - 1/13/2003 11:01:35 AM   
reefguy


 

Posts: 20
Joined: 1/10/2003
From: palmdale, CA, USA
Status: offline 		hello, i purchased a used heli with ys f-91ac, does anyone have this particular engine? or know it very well, i have a few questions to ask you. thanks...
       Post #: 1

ys 91 engine help - 1/13/2003 7:05:18 PM   
Furyflyer2



Posts: 2647
Joined: 6/8/2002
From: middlesex, NJ, USA
Status: offline 		What is your questions , you can also ask the manufacture in the RCU engine manufacture section. http://rcuniverse.com/forumdisplay.php?s=&forumid=156


_____________________________

Paul G,
www.3dxhobbies.com

(in reply to reefguy)
       Post #: 2

ys 91 engine help - 1/14/2003 5:42:40 AM   
sharam



Posts: 62
Joined: 7/19/2002
From: Atherton, CA, USA
Status: offline 		I have that engine, actually the ACH version which means air chamber heli version. What is your question?

Those engines had a sleeve and liner problem - would lose power after spool up and the RPM would just die out. Had to send it back to YS to get it fixed.

It is a very powerful engine - 4 stroke and lots of torque. Run it on Ys 20/20 fuel.

(in reply to reefguy)
       Post #: 3

ys 91 - 1/14/2003 5:58:08 AM   
reefguy


 

Posts: 20
Joined: 1/10/2003
From: palmdale, CA, USA
Status: offline 		sharam, thanks for the reply, used heli ms60 i got it looks like the previous dropped the engine and crack the mounting housing for the air chamber, what it did was got a piece of aluminum and jb weld it on it looks cleanly done with no mounting holes, so obviously i have to modify to fit the air chamber, hate to buy another one or use a 61, but since being inside of the air chamber, wondering if the jb weld would desintegrad/melt in the throttle.

(in reply to reefguy)
       Post #: 4

ys 91 engine help - 1/14/2003 6:04:13 AM   
sharam



Posts: 62
Joined: 7/19/2002
From: Atherton, CA, USA
Status: offline 		Sorry, but I don't know. I guess that the JB weld can become brittle after some time and break off. I would just start it and fly it and not worry about it. Perhaps you can get an experienced pilot to look over the machine before you fly it.

Repairing that engine may be more costly than getting a new 60 size anyway.

Good luck.

(in reply to reefguy)
       Post #: 5

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