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

YS 1.40 DZ sudden rpm drop

Old 04-29-2009, 01:29 AM
  #1  
tuavp
Thread Starter
 
Join Date: Jul 2003
Posts: 80
Likes: 0
Received 0 Likes on 0 Posts
Default YS 1.40 DZ sudden rpm drop

I have been using my YS 1.40 Dingo and Hatori Tune pipe on my Exclusive modelbau FUNTANA PRO plane since years. I might had 250-300 flights, I am using %30 nitro and having 9.200 rpm on ground with 18X6 MEZJLIK CF prop so this rpm let me hoverin on the deck by 1/2 THROTLE or less.

Last 2 flight was horable, engnie started easily as always, checked the rpm - was OK, then take off , straight flight , loops, inverted etc etc was good nothing wrong with the engine but when I come to hovering first 2-3 second OK then when I hit the throtle my engine rpm droped dramaticaly and my plane sit on her rudder, small cracs were repaired and next weekend same thing happened again

Could someone tell me where should I check?? Or what to do??

Thks
Old 04-30-2009, 08:35 AM
  #2  
mjfrederick
Senior Member
 
Join Date: Aug 2006
Location: Denham Springs, LA
Posts: 1,175
Likes: 0
Received 0 Likes on 0 Posts
Default RE: YS 1.40 DZ sudden rpm drop

Check your valve gaps first.
Old 04-30-2009, 08:56 AM
  #3  
petec
My Feedback: (58)
 
petec's Avatar
 
Join Date: Jan 2002
Location: Beaver Falls, PA
Posts: 2,077
Likes: 0
Received 0 Likes on 0 Posts
Default RE: YS 1.40 DZ sudden rpm drop

Has any maintenance been done to the engine? The valve to rocker gap, I agree, is a great place to start. If the problem still persists, how do the bearings feel?

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.