evolution 46 low speed needle
#2
This may or may not help you, http://h1071118.hobbyshopnow.com/Pro...nualUpdate.pdf
#3
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From: ponce inlet,
FL
Not much help there. Just thought if someone had one apart may remember a starting point. Tried 2 turns out still won't idle. screams wide open or not at all.
Help any other boards headings to check?
Help any other boards headings to check?
#4
I have not owned an Evolution engine but on other engines I have found 3 turns out to be a good starting point.
The engine won't run if too lean but will if it is too rich. Too rich will cause hesitation and stalling when advancing the throttle.
The pinch test works on idle setting as well as high speed (pinch the fuel line, if it revs up before dieing it is rich if it just dies it is lean)
The engine won't run if too lean but will if it is too rich. Too rich will cause hesitation and stalling when advancing the throttle.
The pinch test works on idle setting as well as high speed (pinch the fuel line, if it revs up before dieing it is rich if it just dies it is lean)
#5
Keep turning it out until it will start to idle, the fine tune it from there. I had an Irving that worked great at 3.5 turns out, and another (don't remember what one, but think it may be my Super Tiger GS-40) that required 6 turns out.
If it dies as soon as you close the throttle, you are still too lean. Turn the needle out another turn and try it. If its too lean, make another adjustment 1/2 turn out, and repeat these increments and when you have an idea of how it is idling, then work in 1/8 turn increments until you have the idle set. Some engines just take time to get set right.
Hogflyer
If it dies as soon as you close the throttle, you are still too lean. Turn the needle out another turn and try it. If its too lean, make another adjustment 1/2 turn out, and repeat these increments and when you have an idea of how it is idling, then work in 1/8 turn increments until you have the idle set. Some engines just take time to get set right.
Hogflyer
#7
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ORIGINAL: cvedral
I took the carb apart to clean and didnt check how many turns out. Anybody know?
I took the carb apart to clean and didnt check how many turns out. Anybody know?
Doesn't really matter what they were. Just open the barrel to the approximate position for an idle, then close the high end needle. Then attach a fuel line to the nipple on the carb and at the same time, blow into the tube and open the low end until you here a hissing noise. Your low end is now inthe ballpark. Then hook it all back up , open the high end a fee turns and start it up and dial it in from their.
Then when you think you have it close, pinch off the fuel line until the engine quits. Listen to the rpms as this happens. if the rpms increase as the engine quits, low end too rich. Rpms just go down as the engine quits, low end to lean. With this , you can have a perfectly tuned engine. But then, I have never owned an Evolution and have no idea what the carb set up is like. So I may not even know what the heck I'm talking about
#8

Pick a starting point. Cyclic's method is as good as any. Open up the engine to WOT and tune up the HS needle. Slowly close the carb to reduce RPM. When the engine begins to stumble hold it there. Pinch off the carb line (pinch test) and determine if lean or rich. Make SMALL adjustment to LS needle. Return to WOT and retune HS if needed and then reduce throttle as before to "stumble point" again and repeat LS tune until you can get down to idle speed. Recheck all needles and go fly.
#10
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From: ponce inlet,
FL
Thanks guys, I have it running pretty good now. I started with trottle closed then 1 turn out. Once i got it running good i didn't check again.




