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Ys-120 - 1/4/2002 9:00:15 PM   
ifly2



Posts: 72
Joined: 12/30/2001
From: Panama City, FL, USA
Status: offline 		I just purchased an airplane with a YS-120 in it. On the engine, it just says YS F-120. Is there a way to tell if it is a 120AC, 120FZ...??


Les
       Post #: 1

ys120 - 1/5/2002 1:14:07 AM   
4point


 

Posts: 3
Joined: 12/21/2001
From: Melbourne, FL, USA
Status: offline 		ys-120ac the"ac" stands for air chamber. This is an air box aft of the engine head and above the carburator.

(in reply to ifly2)
       Post #: 2

ys ident - 1/5/2002 6:11:03 PM   
Cuda


 

Posts: 52
Joined: 1/1/2002
From: Iowa
Status: offline 		I believe all ys 120 have the same case markings for the past few years,just different appearance of the engine, the ac has an air chamber above the carb.YS Performance can help you determine which it is , go to their website and look at the pictures,at any rate if the motor is in good shape then you will have a great engine.........cuda

(in reply to ifly2)
       Post #: 3

Ys-120 - 1/10/2002 5:25:52 AM   
Marty Phillips



Posts: 11
Joined: 12/5/2001
From: Lakewood, CO, USA
Status: offline 		For part numbers and YS engine diagrams goto:
http://www.centralhobbies.com/Engparts.html

_____________________________

[b]Semper Fi,[/b]
[i]To those who know, no explanation is necessary, and to those who do not, no amount of explanation

(in reply to ifly2)
       Post #: 4

Ys-120 - 1/10/2002 10:55:41 AM   
mglavin



Posts: 5203
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		The only obvious differences as realized from looking at the engine are the existence of an air chamber and the carb/throttle Venturi bore. There maybe others but I cannot think of any.

Internally the differences are readily apparent. Valve sizes, gas-ported heads, crankshafts and pistons are different on almost all of the various YS 120 engine models.

_____________________________

Michael Glavin
RCU Community Moderator
Hitec * Multiplex Field Representative

(in reply to ifly2)
       Post #: 5

Ys-120 - 1/10/2002 6:12:26 PM   
ifly2



Posts: 72
Joined: 12/30/2001
From: Panama City, FL, USA
Status: offline 		Thanks to all that answered, I do not have the air chamber, so that elimintaes the AC model. I could not see any other exterior differences. I am not having any problems, was just interested in which one I have, since it was on a plane I bought.

Les

(in reply to ifly2)
       Post #: 6

ys 120 - 1/11/2002 10:25:44 PM   
INXS


 

Posts: 5
Joined: 1/5/2002
From: murrieta , CA, USA
Status: offline 		the difference can be determine by the prop thrush washer
[between prop and crank case] they are different

(in reply to ifly2)
       Post #: 7

Ys-120 - 1/11/2002 11:40:31 PM   
mglavin



Posts: 5203
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		INXS is correct there is a physical difference in appearance of the drive washer on some of the models.

120FZ, 140L and 140FZ same drive washer.

120SC, NC same drive washer, there is a groove around the perimeter. same OD end to end.

120AC, SF same drive washer, no groove, OD steps up in size at the serrated end/prop side of the drive washer.

AC, SF and NC have a 11 mm inside diameter throttle body. No mid-range/idle adjusting needle. Different throttle barrel retaining setup than the FZ and SC.

FZ, SC, have a 14mm inside diameter throttle body.

< Message edited by mglavin -- Jan 11 2002 6:57PM >

_____________________________

Michael Glavin
RCU Community Moderator
Hitec * Multiplex Field Representative

(in reply to ifly2)
       Post #: 8

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