Register

If this is your first visit, please click the Sign Up now button to begin the process of creating your account so you can begin posting on our forums! The Sign Up process will only take up about a minute of two of your time.

Results 1 to 6 of 6

  1. #1

    Join Date
    Jul 2005
    Location
    Corpus Christi , TX
    Posts
    345
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    OS 91 DF engine help please!

    Well, its July 4th, and its been pouring rain for days in Texas.....no flying. Cant get my OS91 started to test fly this used YAF-16A that I picked up.

    I put an arrow to the air mixture valve to ask a question....from the closed position and the body adjustment sitting at 90deg, how many rounds out do I need to start at? Im assuming this is just like the high end needle? New to DF engines so any thing helps!

    thanks and have a great 4th of July!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Us52938.jpg 
Views:	5 
Size:	58.3 KB 
ID:	716056  

  2. #2

    Join Date
    Feb 2002
    Location
    Fayetteville, TN
    Posts
    38
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: OS 91 DF engine help please!

    From the closed position try 2 rounds out that should get you started then adjust from there and if the engine been sitting for a while take the glow plug out and put a few drops in the hole this should get you started and get the fuel to the carb. hope this help.

    Robert

  3. #3
    ECalderon's Avatar
    Join Date
    Dec 2001
    Location
    Santiago, CHILE
    Posts
    147
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: OS 91 DF engine help please!

    Hi:

    Two turns open is a good place to start.

    To start my engines, especially after the plane has been unflown for a while, I disconnect the pressure tubbing from the fan, and with a siringe I put pressure in until I can see the fuel just getting to the carburator, then I unscrew the plug and do as Robert said. That way the engine starts at the first try every time. Doing it this way, the hex screw at the fan lasts a lot longer. Remember to put some grease in yor hex starter, otherwise the screw wonΒ΄t last long (ask me how I know).

    Regards

    Eduardo

  4. #4

    Join Date
    Jul 2005
    Location
    Corpus Christi , TX
    Posts
    345
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: OS 91 DF engine help please!

    Man, you guys are great!

    On the starter cone, the hex backs out when starting, its threaded opposite. So, am I going to have to pull the whole thing out and use a piston lock tool to tighten her down? or can I do my best from upfront and loctite it in? For my helis we use a locking tool to tighten the fans on, but its easy to get to...

    am I gonna have to pull the whole thing out? LOL?!?!?!?

    great 4th!

  5. #5
    Jet Doctor's Avatar
    Join Date
    Sep 2003
    Location
    Johannesburg, SOUTH AFRICA
    Posts
    305
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: OS 91 DF engine help please!

    Loctite is the best way. You can hold the fan using a rag and tighten as best as you can. Leave until Loctite is set.
    Go Big or Go Home!

  6. #6
    Rudeboy's Avatar
    Join Date
    Dec 2002
    Location
    Kortessem, BELGIUM
    Posts
    3,421
    Gallery
    My Gallery
    Models
    My Models
    Ratings
    My Feedback

    RE: OS 91 DF engine help please!

    If you don't want to take the whole thing apart, you can fill the cilinder with oil (through the plug hole) to act as a crank lock. Then use a good hex wrench to tighten it down. Maybe use a good pair of Vise Grips on the hex wrench.
    Revver Brother #33
    ...I think it needs more power...


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -6. The time now is 12:12 AM.

SEO by vBSEO 3.6.1 ©2011, Crawlability, Inc.