View Full Version : Idle speed tuning
01-01-2008, 09:59 PM
Part of my problem might be the cold temps I broke the motor in at. It was about 35 degrees. We openned out Jato 3.3 Christmas day and have .75 gallon through it so far. These little motors are much touchier than the .61s and .90s I had in helis. Anyway I think (?) I have the high speed needle set just about right for the temps. The pinch test for the low speed needle seems correct also. My problem is the idle speed keeps increasing and when I turn the idle speed screw counterclockwise it speeds up more.
What the heck do I have screwed up?
01-01-2008, 10:02 PM
then turn the idle in or the other way. The idle screw is like a chock (sp?) if the crack is too small it won't get fuel, if it is open too far it will flood. I think a good thing to check if your idle is take a zip tie and put it in there it should be the same with of a zip tie, or a old credit card.
01-01-2008, 10:07 PM
you could look at the slideing part when you are turning the screw just remember to put the filter back on
01-01-2008, 10:21 PM
The small zip tie right?About two inches long 1/8''th wide?
01-01-2008, 10:26 PM
yeah that one..your idle should be about 1MM gap in it
01-01-2008, 11:14 PM
I used the ones that go on the coupler. I cut them in half long ways and that is a good idle. Or take a old credit card and cut alittle off.
01-02-2008, 08:46 PM
if the gap is to big the idle will be high, and if the gap is small it will not run at idle much, without giving it gas to keep it going!
01-03-2008, 06:37 PM
your pinch test should be around 3 seconds. under two its lean, over 4 it's rich. after you adjust your lsn, then adjust your idle because the lsn affects your idle.
take off your airfilter, and the gap between the screw that hold the carb open to idle your truck should be 1-2mm gap, about the thickness of a credit card.
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