Notices
YS Engines Support Direct support from YS Performance Engines by Dave Shadel

YS170 Sudden Dead Stop from Fast Idle

Old 03-19-2020, 02:51 AM
  #1  
low701
Junior Member
Thread Starter
 
Join Date: Mar 2020
Location: Norfolk UK
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default YS170 Sudden Dead Stop from Fast Idle

I was running my newly purchased second hand YS170 for the third time in the air-frame in preparation for a first flight.
I was setting up the existing throttle servo end points to match my RC system. Trying to get a stable idle ready for flight.
During the third engine run the motor suddenly stopped dead from a fast idle.

Anyone experienced this before?
There is now no compression, I haven't tried to restart. Suspect I need to strip down to find the problem.
There was a metallic clunk when the engine stopped, but carefully turning the engine over by hand does not make any odd noises.
Old 03-22-2020, 01:23 AM
  #2  
low701
Junior Member
Thread Starter
 
Join Date: Mar 2020
Location: Norfolk UK
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default

Further to my first post I used the wrong terminology. The engine stopped while on fast tickover while trying to set low throttle position on the servo.
Havent run the engine at WOT yet.
Old 03-28-2020, 02:30 PM
  #3  
speedracerntrixie
My Feedback: (29)
 
speedracerntrixie's Avatar
 
Join Date: Jun 2010
Location: Happy Valley, Oregon
Posts: 7,363
Likes: 0
Received 4 Likes on 4 Posts
Default

If you haven't already done so, pull off the rocker cover, I have a feeling you will see a stuck valve.
Old Today, 08:37 AM
  #4  
low701
Junior Member
Thread Starter
 
Join Date: Mar 2020
Location: Norfolk UK
Posts: 3
Likes: 0
Received 0 Likes on 0 Posts
Default

Whipped rocker cover off. Turned over by hand, Both valves working, decent compression.
Put my new starter on the front and gave it a spin.
Felt ok for 2 seconds then both valves stopped working.
Does not sound like anything broke, what could have occurred?

Would you advise I attempt a fix myself?

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.