I have a BME 110 which on the whole I like well so far.The engine has about 60 flights so it is still relatively new. My problem is with idle speed. Sometimes the idle sped will not come down even though I have lowered the throttle to were it usually has a nice low idle. The linkage is very good with digital servo for throttle so the problem is not with position of the throttle plate. It does not always do this but when it does the idle stays up high enough to preclude landing. I have installed an optical kill switch to deal with this problem but would really like to find out what is causing it. Do any of you BME 110 owners have this problem and if so what have you done about it? Thanks Dave.

I will bet your problem is in the way your needles are set, have you adjusted them yet?
There also could be a possible air leak around the carb block, although that usually does not happen unless the bolts have loosened.

Oh boy.... I remember a problem that sounds just like what you are experiencing. It was at an airshow 2 years ago. Kolby Kuipers was is name, and the idle wouldn't want to come down all the time. Now if I remember correctly, I didn't personnaly fix it, but I did watch. He had taken off the whole carburator off, and a screw for the butterfly valve somewhere a little loose, it seemed like it was hard to tighten but then he put it back together. The motor ran just fine, at any speeds and the idle was just awsome!

Sorry I wouldn't be able to answer any questions, all I remember is that there was a screw loose somewhere in the carburator.

LeBlanc

Hi Dave!---I had the same problem on a BME 110 & also two YW 48---Drove me crazy!, turned out to be a "Lean" high/mid-range fuel mix---Even tried different ign. timing advance/retard curves---For me, lowering the metering lever spring pressure & a richer HS needle setting, solved the problem---Hope this helps---

If your engine will idle for 30 minutes then you are too lean. Idle surging and not wanting to drop is usually a sign of too lean on the low end.

Hi Bodywerks---I agree, lean on the low end will cause surging---(but did you really mean "30 minutes"?)---

This fixed mine also.

I have two BME 100's and they have the same problem.
It is basically the nature of the beast.
Please clarify that the fix is to lower the spring pressure.
If you lowered it, what did you lower it to?

Geistware---He probably lowered the pop off pressure. To date I have not had this problem on my 110, and I have had a couple of pretty lean runs.

Check out this site, it worked on my 110. http://www.aerocorsair.com/id28.htm

I know you said you have a good throttle servo, but are you using nyrod? If so the heat from the mufflers will expand it and it will cause what you are having. Solution... use a long metal threaded rod attached to the end of the nyrod that runs through the hot area. Better yet, replace the nyrod with Sullivan Precision Rod and do the metal trick also... this will never expand/contract.

Just wanted to start with the easy stuff before you take the carb apart.

Cheers

Heck, just dispense with the nyrod and use CF with swivel ball links on each end. It hasn't failed me yet and is more positive than any nyrod type connection.