Greetings,


Ok here is the problem. The engine start fine and run strong at high speed. However the idle is not consistent. (Go up and die after 30 second) The 2 needle are 1 1/2 turn per the instruction.
The idle seem to be lean. I openned the idle screws 3 turn out and it change nothing. I checked the fuel tank and evrything is fine..Any idea guys?? The ignition battery are fully charged and I run 50/1.

Thanks
Serge

serg, you may want to richen up the hi and lo needle about 1/8 turn. See what happens.. the 1 1/2 turns are starting points but are needed to be adjusted a bit depending on each engine/plane/gas/environment/etc. Try it and see what happens. I worked in the chain saw industry for 10 years as a mfg rep.. so I have a little insight into the carb thing..... just wanted you to know.. BobH.

serge, sorry I just re-read your post. You said you opened up the lo speed 3 turns or.. the idle screw, and nothing changed?. If you opened the lo speed needle and nothing changed then its a fuel restriction problem from somewhere. ?? could be a pin-hole in the fuelline?.. you didnt say if the engine was new or used and how used?.. could be a small retriction in the carb, or fuel filter/pickup. Even an airleak in a gasked or crank shaft seal (althought I doubt the later). If you just moved the idle (which only moves the position of the butterfly) it wont correct a fuel issue.. Regards BobH.

Thanks Bob,


The engine is brand new. I did the break in this winter an the engine was running fine...Probably a air leak or something in the pick up line...Will check tomorow..

Thanks
Serge

Serge, one other thing to think about. If you have the same gas you were using this winter it may not be the right blend for warmer weather.. I would change it for fresh gas as a first step to diagnosis.. BobH.

Hi Bob,

Thanks, However I am totally pissed...I spent the whole day on the engine and still can't find the problem. I did everything you said and triple checked everything!! The carb primary inlet screen is clean... I also checked the piston by the exhaust window and its like brand new. The engine start fine and pull strong at high rev..However when I pull back to idle the engine run a few second, start to rev and die...I changed the plug, fuel lines, removed filter, new tank with new clunk etc......

The only thing I can see is not enough back pressure from the muffler at idle...

Oh well...

Serge

Serge, sorry to hear of your frustrations. The screen in the carb is not the only place where debris can lodge. There are the jets on the other side of the carb that you cant see but can get stuff in them. Those jets are located under Welch plugs which would need to be removed and replaced after you inspected the jets. That would require a carb repair kit to get those parts.
I think your engine is new..??... have you removed from the plane.. mounted it in some kind of stand with different fuel lines and tank and tried running it that way?....did you open the LO speed needle to 2 turns open?..This would remove a Non Engine related problem specific to that plane/fuelsystem.

I am trying to save you the aggrivation of sending your engine to Southgate Aero. I'm sure its under warrenty if its new?.. I know Bill Oberdyke pretty well and they are good guys.. if you can, you can try what I suggested.. after that? you might give The Mfg a call to send it in.. Sorry I can't be more specific.. its the kind of problem that is simple once you know what it is.. its finding it that can cause fits!!... Regards BobH.

Hi Bob,


Yes the engine is brand new. In fact I have two TS 52. One in my G.P pitts and the other in my Wagstaff 300S. I am sure the problem is no big deal but I must put my finger on it. Bill from
Southgate Aero is fantastic!! Customer service is his top priority.
You can't go wrong with Taurus engines. Now I must work my brain to find that dam little problem...I am gonna put a part the carb again and see what I can do...

Tnanks again!
Serge

Hey Serge-- there is no pressure from the muffler on gas engines. The fitting on the muffler is for smoke. Run the vent line out the bottom of the cowl. The carb has a dipharam that pumps gas to the carb. TRY THIS FIRST!!!! Also, how old is the gasoline?

Say Serge:
Swap a known good carb from your other Taurus onto the one that is acting up. This will tell you if the problem is in the carb or elsewhere.

Serge, I would agree with diablo and swap out carbs... If they are both the same engines. That will tell you where to look if the other carb works fine... BobH.

AJF,


I feel like a complete idiot.......Perhaps that's the problem....

The gasoline is new from the pump.

Thanks so much!!

Serge

Well after 3 days of time waste and frustration I nailed the problem...The dam carb is deffective!!!! I put the carb from my other TS 52 and the engine run like a clock!! Oh well...I dont know what is wrong with the faulty carb ... I am glad i found the problem!!

Tnanks all for the help!!
Serge

I'm going through the same exact problem on my brand new bme 50 and I am sure it is the carb also. I have someone looking at it now and they told me they think the problem is under the welch plug. We will see tomorrow when I pick it up. It's a shame the carbs have to have debri in them from the factory but that's the way it goes.