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!

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

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 won´t last long (ask me how I know).

Regards

Eduardo

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!

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.

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.