ys 120
07-13-2006 | 07:13 PM
#1
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From: middleton,
PE, CANADA
ys 120
i have an old ys 120 that runs good idles good poor midrange can see air bubbles going to the needle in midrange rpm twidling with the regulator doesent seem to stop it diaphram is good and new . where do i look
robert
robert
07-15-2006 | 01:27 PM
#3
RE: ys 120
DAVE SHADEL
I have a YS 120 FZ that I haven't run for 2 years, in a Dave Patrick Ultimate Bipe. Last week I wanted to fly it. I rotated the prop with my finger and felt practically no compression. I assumed a valve or valve seat was the problem. I gapped the rockers arms, no change. I pulled the head off and the head looked clean and so did the valve seats, although I don't know how to remove the valve springs. I put it back together with a new glow plug, and thought what the heck, I'll fly it anyhow. When I started it and then stopped it, I felt some compression. I took off and made my turn and didn't like the pulling power of the engine, I was using a 16-8 APC. I did a couple of rolls and the plane was boring. I changed props to a 15-6, got 10,420 RPMs. Still no better in the air, but it seemed to pull well on the ground. I'm using Cool Power 15%
Actually, I'm not sure it ever ran as expected as I was bored with the plane and hung it up after
two flights. I have had YS engines in the past, but they were .60 and .61 engines for my pattern planes. Not feeling any compression really stumps me.
If you can't offer a solution from my description, tell me who to send the engine to for checkout and repair.
Regards, FRED
I have a YS 120 FZ that I haven't run for 2 years, in a Dave Patrick Ultimate Bipe. Last week I wanted to fly it. I rotated the prop with my finger and felt practically no compression. I assumed a valve or valve seat was the problem. I gapped the rockers arms, no change. I pulled the head off and the head looked clean and so did the valve seats, although I don't know how to remove the valve springs. I put it back together with a new glow plug, and thought what the heck, I'll fly it anyhow. When I started it and then stopped it, I felt some compression. I took off and made my turn and didn't like the pulling power of the engine, I was using a 16-8 APC. I did a couple of rolls and the plane was boring. I changed props to a 15-6, got 10,420 RPMs. Still no better in the air, but it seemed to pull well on the ground. I'm using Cool Power 15%
Actually, I'm not sure it ever ran as expected as I was bored with the plane and hung it up after
two flights. I have had YS engines in the past, but they were .60 and .61 engines for my pattern planes. Not feeling any compression really stumps me.
If you can't offer a solution from my description, tell me who to send the engine to for checkout and repair.
Regards, FRED
07-16-2006 | 11:48 AM
#5
RE: ys 120
Dave Shadel
Thanks Dave. You didn't tell me where to send the engine for repair, but a Google search turned up YS Performance and a phone number (775-265-7522) for information.
If you have further thoughts, kindly PM me.
Regards, FRED
Thanks Dave. You didn't tell me where to send the engine for repair, but a Google search turned up YS Performance and a phone number (775-265-7522) for information.
If you have further thoughts, kindly PM me.
Regards, FRED
