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Read through all the list your set up posts and mine is similar to most. It's a eBay rescue but almost new not broken in all the way. I start off flying rich and keep leaning out the needle valve tiny amounts each flight. It flys too slow until finally it gets lean enough then flys too fast. There's no place you can put the needle to make it work right for the whole flight. Are they all like this until they loosen up or should I intervene and lower the compression ratio?

Blue OS LA 46 stock
one head gasket
.271 venturi
supertiger nva
TT 11x4.5 prop
10% nitro 50/50 oil
Full muffler from a Webra 40
4oz Uniflow tank
Twister


Thanks,
Motorman

They do not need  de-compressing, try 5%  nitro if it has too much power, If the engine  keeps  leaning as it goes through the  pattern, Then you may have another  problem, It should hold a needle setting, and the  LA 46 needs  just a little breakin
You should be able to launch that setup you have just into a 2 cycle, it should  go richer when launched and  should cackle in a  in between  4/2 in level flight, If its  goes lean and  stays there  check for leaks, bad tank, leaking filter, pin hole in the line,  and  Do NOT run pressure

Randy

  I agree it has to be a leak or something else fuel related. On the couple I am operating, I have never had anything close to a runaway. If I hit the needle setting too lean, it holds that setting through the flight until the tank runs out. And it does not take too many runs to break one in. It has got to be the most stunt friendly engine I have ever operated, but all the other parts of the system have to be correct.
  Type at you later,
   Dan McEntee

Ditto's to what Dan wrote.  The only difference between yours and mine is that I run muffler pressure (sorry Randy) w/o uniflow and I use an 11-5 but the ship is 600 squares and 52oz which is much larger than a Twister.  Where I set mine on the ground is where it stays in the air except for about a lap on takeoff where it richens just a bit then recovers as it adjusts to the centrifugal force on the fuel.  I fly it on a very fast 4 and it does not 4-2 or go lean except at the very end of the tank when it quits.  I have gone as many as 20 flights without ever touching the needle.  Unless there is a gasket or venturi leak, your problem is, it is not the engine.

Ken

The only obvious difference between the setup I run and the setup you report is that I use an OS E3030 muffler, or a Tower 40 muffler, depending on whether the plane is nose heavy (the Tower 40 muffler is much lighter than the OS one).

I don't know if that muffler makes a difference, but after you check absolutely everything for leaks, you may want to slap a 3030 on there and try it out.

Same needle setting and prop, it flew 5.25 sec. laps and the engine quit clean. It's still running a lean 4 stroke with no real break so I might try a smaller venturi and leaner setting but for now I'm a happy camper.

I run my 64 ounce, 700 squares Atlantis on an APC 11.5x4 prop in a wet four; it loves it.

Run my .46LA on my Twister with a RSM GRW Snubnose 4.75oz Uniflow.

Center of tank is one cooling fin above the Glowplug.

TT 11x4.5 prop

Randy's PA NVA

Plane is 40oz

Runs flawless.

Sent from my SM-G965U using Tapatalk

The 46LA seems to want a bigger prop on smaller planes, and visa-versa.  Dunno why, but I think it's because it can turn faster and develop more power with a smaller prop.

The  Cyclone  11 x 4.5  work  very well on large and small planes  using the  LA 46, it is amazing how well

Randy