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Old 08-28-2013, 02:02 PM   #1
HickOnACrick OP
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Flex Jet 2 question

I can't remember which way to turn the flex jets for altitude. Can't find the info from Master Mechanic Google.

Jetted for 3K, and haven't needed to touch my flex jets since I installed them 3 years ago. Now I can't go fast enough above 8K so clearly this is a dire emergency.

Thanks in advance.
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Old 08-28-2013, 02:26 PM   #2
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"in" or clockwise is leaner.
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Old 08-28-2013, 02:38 PM   #3
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Quote:
Originally Posted by Rootkiller View Post
"in" or clockwise is leaner.
Yep. I live at 850', and I turn in one quarter of a turn when I ride in Denver.
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Old 08-28-2013, 04:58 PM   #4
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Good timing with info, ours go in in a coupla days here in Colombia, I was going to ask the elevation question of turns out based on factory jetting.

So not to jack the thread but to add to it is there a "rule of thumb" of how many turns out based on so many meters or feet of elevation?
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Old 08-28-2013, 05:24 PM   #5
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Talking Friendly Correction

Quote:
Originally Posted by Rootkiller View Post
"in" or clockwise is leaner.
They are pilot air screws, not pilot fuel screws.

If you turn them out you increase (and therefore make lean by allowing more air through the passage) the pilot circuit.

The screws postion on the carb body tells you which circuit is affected- on the intake side of the carb it is an air screw, on the airbox side it is a fuel screw.

Hope this clears things up, this comes up from time to time here on OC
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Old 08-28-2013, 05:35 PM   #6
borborygmus
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pilot "air screw"

you sure about that?
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Old 08-28-2013, 06:27 PM   #7
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Originally Posted by geometrician View Post
If you turn them out you increase (and therefore make lean by allowing more air through the passage) the pilot circuit.
OK, I have to disagree. No disrespect, but that's just not right. I've jacked with my carbs for the past three years and I know what those screws do. Is it an air screw? Is it a gas screw? I could care less. I care about what happens when you turn it in a particular direction. Turning in leans the mix.

I can definitively say that if you ride to higher altitudes, you need to turn the screws clockwise -- IN -- because the bike will be running with less oxygen in the air and will be rich until you turn the screws IN.

I've tried just about every IM setting on my bike. At the tighter settings -- like 1/2 turn out -- my bike will blow white smoke because it is too lean. A bike only blows white smoke like that when it is too lean. I've also gone out to as much as three turns out. The bike smells like a 1970s muscle car because -- it's too rich.

No question about it, you lean up the mix as you turn the screws in, period. I've had my bike on an exhaust sniffer just recently and ran through various IMS settings to find the right exhaust gas. We did everything with the IMS settings, including going all the way closed. The bike died because it was so leaned out that it died.

Going IN with the screws leans the mix. Period. Don't believe me? Put the bike on an exhaust sniffer and prove it to yourself. Again, no disrespect intended. The guy just needs to tune his carbs for the altitude, and you turn IN when you go up in altitude because you need less gas in the mix to match the thinner air. No question about it.
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Orangecicle screwed with this post 08-28-2013 at 08:19 PM
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Old 08-28-2013, 08:11 PM   #8
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From my experience based upon where the screw is located on the carb and how the engine reacts to the IMS, I will always continue to address it as a "Fuel" screw. Out(CCW)=More, In(CW)=Less fuel.
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Old 08-28-2013, 08:23 PM   #9
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There are several keihin "how to" tune web sites and they all agree with head2wind. Think I would go with the fuel screw and cw is leaner.
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Old 08-28-2013, 09:36 PM   #10
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Perhaps the confusion comes from the fact that four-stroke carbs have fuel screws and two-stroke carbs have air screws. Can happen to the best of us.
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Old 08-29-2013, 01:43 PM   #11
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Clear understanding is probably not helped by references such as this, from the LC8 Repair Manual.

Quote:
Before removing the idle-air mixture control screw #7, screw in to the
limit. Count and note down the number of turns.
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