ORIGINAL: jongurley
I tweeked and tuned and tweeked and tuned, and can't get the damn thing to transistion,,,,, I think I was 3/4 out on the low and
2 1/2 on high, however we tryed about ever combination,,,, , it would burp transisiton good on the sticks or with someone holding it,, but as I take the time to taxi out on the runway it just slugs around, and just for FYI someone is probrably thinking it is a air flow problem, but it does it constantly in a hover or what ever,,,,, I can be idling good and started easing to full throttle and then nail it to full throttle and it takes half the runway to start turning up, ,,, and in the air once you can get it to wide open throttle it rips the prop,, but for instance,, I can pull into a hover, and it sounds like it is going to cut off, but while it is hovering at pretty much idle, I can shove the throttle to full to pull out and the engine doesn't even want to change rpms, it just stays pretty much the same rpms,, it wont' even pull out of a hover, , ,I have 3 gallons through the engine now,,
I have seen myself in this scenario.
Although leaning the needles seemed to work, I got to the point where just was too way lean. Then I tried a lower diameter propeller, that is I went from 27X10 to 26X10 ( I thought the engine was still too new and I was too demanding) The transition improved, however started acting up again the following weekend.
A friend of mine that does not fly BME told me that the 27X10 must be the one to go and gave me couple of additional advices:
1) Clean up the spark plugs
2) Discard the fuel can and start with a new one
3) put back the 27X10
Since I was kind of lost in the needle setting I set the "factory" settings as per the BME manual recommendations. I did not need to change the “factory” settings they worked just wonderfully.
That seemed to work fine for couple of weekends; I was really pleased with these simple steps, however... last weekend started acting up again.
It is still in the broken in process? That weekend was particularly warm up here in Mexico; do the atmospheric conditions impact the gas engines in such degree? It is just a consequence of the engine being under the broken-in process and now need to re-adjust the needles again?
I guess next step is to start tweeking the needles however I am reluctant since they worked just fine couple of weeks ago.
I modified the crab plate and soldered a nipple and connected a line to avoid faulty diaphragm operation.
The engine has been baffled.
Any suggestions?